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Full-Text Articles in Physical Sciences and Mathematics
Clinically Amendable, Defined, And Rapid Induction Of Human Brain Organoids From Induced Pluripotent Stem Cells, Eva Tomaskovic-Crook, Jeremy Micah Crook
Clinically Amendable, Defined, And Rapid Induction Of Human Brain Organoids From Induced Pluripotent Stem Cells, Eva Tomaskovic-Crook, Jeremy Micah Crook
Australian Institute for Innovative Materials - Papers
Human brain organoids provide opportunities to produce three-dimensional (3D) brain-like tissues for biomedical research and translational drug discovery, toxicology, and tissue replacement. Here we describe a protocol for rapid and defined induction of brain organoids from human induced pluripotent stem cells (iPSCs), using commercially available culture and differentiation media and a cheap, easy to handle and clinically approved semisynthetic hydrogel. Importantly, the methodology is uncomplicated, well-defined, and reliable for reproducible and scalable organoid generation, and amendable to principles of current good laboratory practice (cGLP), with the potential for prospective adaptation to current good manufacturing practice (cGMP) toward clinical compliance.
3d Scaffolds Of Polycaprolactone/Copper-Doped Bioactive Glass: Architecture Engineering With Additive Manufacturing And Cellularassessments In A Coculture Of Bone Marrow Stem Cells And Endothelial Cells, Xiaoju Wang, Binbin Zhang, Sanna Pitkanen, Miina Ojansivu, Chunlin Xu, Markus Hannula, Jari A. Hyttinen, Susanna S. Miettinen, Leena Hupa, Gordon G. Wallace
3d Scaffolds Of Polycaprolactone/Copper-Doped Bioactive Glass: Architecture Engineering With Additive Manufacturing And Cellularassessments In A Coculture Of Bone Marrow Stem Cells And Endothelial Cells, Xiaoju Wang, Binbin Zhang, Sanna Pitkanen, Miina Ojansivu, Chunlin Xu, Markus Hannula, Jari A. Hyttinen, Susanna S. Miettinen, Leena Hupa, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
The local delivery of Cu2+ from copper-doped bioactive glass (Cu-BaG) was combined with 3D printing of polycaprolactone (PCL) scaffolds for its potent angiogenic effect in bone tissue engineering. PCL and Cu-BaG were, respectively, dissolved and dispersed in acetone to formulate a moderately homogeneous ink. The PCL/Cu-BaG scaffolds were fabricated via direct ink writing into a cold ethanol bath. The architecture of the printed scaffolds, including strut diameter, strut spacing, and porosity, were investigated and characterized. The PCL/Cu-BaG scaffolds showed a Cu-BaG content-dependent mechanical property, as the compressive Young's modulus ranged from 7 to 13 MPa at an apparent porosity of …
Ultrasonic Spray Deposition Of Tio2 Electron Transport Layers For Reproducible And High Efficiency Hybrid Perovskite Solar Cells, Jingsong Sun, Alexander Pascoe, Steffen Meyer, Qijie Wu, Enrico Della Gaspera, Sonia Raga, Tian Zhang, Andrew Nattestad, Udo Bach, Yi-Bing Cheng, Jacek Jasieniak
Ultrasonic Spray Deposition Of Tio2 Electron Transport Layers For Reproducible And High Efficiency Hybrid Perovskite Solar Cells, Jingsong Sun, Alexander Pascoe, Steffen Meyer, Qijie Wu, Enrico Della Gaspera, Sonia Raga, Tian Zhang, Andrew Nattestad, Udo Bach, Yi-Bing Cheng, Jacek Jasieniak
Australian Institute for Innovative Materials - Papers
The fabrication of high efficiency perovskite solar cells at larger scales will rely on the optimized deposition conditions of every layer using scalable methodologies. Most current perovskite devices that employ the archetypal TiO2 hole blocking layer utilise a simple air-brush approach. This approach is not scalable as it results in significant layer inhomogeneity across larger devices areas. To overcome this inherent limitation, in this work we use ultrasonic spray deposition as an alternative approach for the TiO2 deposition. Focusing on identical reaction chemistries as for air-brush, namely bis(isopropoxide)-bis(acetylacetonate) titanium (IV) based solutions, we find that under optimized conditions smooth TiO2 …
Ambient Synthesis Of One-/Two-Dimensional Cuagse Ternary Nanotubes As Counter Electrodes Of Quantum-Dot-Sensitized Solar Cells, Xin Qi Chen, Yang Bai, Zhen Li, Lian Zhou Wang, S X. Dou
Ambient Synthesis Of One-/Two-Dimensional Cuagse Ternary Nanotubes As Counter Electrodes Of Quantum-Dot-Sensitized Solar Cells, Xin Qi Chen, Yang Bai, Zhen Li, Lian Zhou Wang, S X. Dou
Australian Institute for Innovative Materials - Papers
2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. One-/two-dimensional ternary CuAgSe nanotubes (NTs) were successfully prepared from copper selenide (Cu2-xSe) NTs at room temperature within a short reaction time by the facile cation-exchange approach. Cation exchange leads to the transformation of the crystal structure from cubic into orthorhombic and/or tetragonal with good retention of morphology. The exchange reactions are spontaneous owing to large negative changes of the Gibbs free energy. The effects of parameters such as reaction time, precursor source, and precursor ratio on the exchange reaction were investigated. The resultant CuAgSe NTs were explored as counter electrodes (CEs) of …
A Bi-Layer Tio2 Photoanode For Highly Durable, Flexible Dye-Sensitized Solar Cells, Jianjian Lin, Yong Peng, Alexander Pascoe, Fuzhi Huang, Yi-Bing Cheng, Yoon-Uk Heo, Andrew Nattestad, Wanchul Seung, Sung Kyun Kim, Hoon Joon Yoon, Sang Woo Kim, Yusuke Yamauchi, S X. Dou, Jung Ho Kim
A Bi-Layer Tio2 Photoanode For Highly Durable, Flexible Dye-Sensitized Solar Cells, Jianjian Lin, Yong Peng, Alexander Pascoe, Fuzhi Huang, Yi-Bing Cheng, Yoon-Uk Heo, Andrew Nattestad, Wanchul Seung, Sung Kyun Kim, Hoon Joon Yoon, Sang Woo Kim, Yusuke Yamauchi, S X. Dou, Jung Ho Kim
Australian Institute for Innovative Materials - Papers
Low-temperature processing of dye-sensitized solar cells (DSCs) [B. Oregan, M. Grätzel, Nature, 1991, 353, 737] is crucial to enable their commercialization with low-cost plastic substrates. Much of the previous work in this area has focused on mechanical compression of premade particles on plastic substrates; however, many reported that this technique did not yield sufficient interconnections for high charge carrier transport. Herein, we present bi-layer photoanodes that incorporate microstructured TiO2 sea-urchin-like assemblies, composed of high-aspect-ratio single crystalline nanoribbons, i.e., two-dimensional subunits, which were deposited onto a nanoparticle layer (commercial P25), with a 5.6% conversion efficiency realized. We demonstrate that …
Enhanced Electron Lifetime Of Cdse/Cds Quantum Dot (Qd) Sensitized Solar Cells Using Znse Core-Shell Structure With Efficient Regeneration Of Quantum Dots, Rasin K. Ahmed, Long Zhao, Attila J. Mozer, Geoffrey D. Will, John M. Bell, Hongxia Wang
Enhanced Electron Lifetime Of Cdse/Cds Quantum Dot (Qd) Sensitized Solar Cells Using Znse Core-Shell Structure With Efficient Regeneration Of Quantum Dots, Rasin K. Ahmed, Long Zhao, Attila J. Mozer, Geoffrey D. Will, John M. Bell, Hongxia Wang
Australian Institute for Innovative Materials - Papers
Research on development of efficient passivation materials for high performance and stable quantum dot sensitized solar cells (QDSCs) is highly important. While ZnS is one of the most widely used passivation material in QDSCs, an alternative material based on ZnSe which was deposited on CdS/CdSe/TiO2 photoanode to form a semi-core/shell structure has been found to be more efficient in terms of reducing electron recombination in QDSCs in this work. It has been found that the solar cell efficiency was improved from 1.86% for ZnSe0 (without coating) to 3.99% using 2 layers of ZnSe coating (ZnSe2) deposited by successive ionic …
A Versatile Binder-Free Tio2 Paste For Dye-Sensitized Solar Cells, Jeremy H. Yune, Inna Karatchevtseva, P Evans, Klaudia K. Wagner, Matthew J. Griffith, David L. Officer, Gerry Triani
A Versatile Binder-Free Tio2 Paste For Dye-Sensitized Solar Cells, Jeremy H. Yune, Inna Karatchevtseva, P Evans, Klaudia K. Wagner, Matthew J. Griffith, David L. Officer, Gerry Triani
Australian Institute for Innovative Materials - Papers
In this study, binder-free TiO2 colloidal pastes have been prepared using a variety of heterocyclic bases with diverse characteristics to produce robust photoanodes for dye-sensitized solar cells (DSSC) from a single cast film thickness of 5 micron. The influence of the base on the electrode structure and film morphology, including its electron donor characteristics are investigated after low temperature thermal treatment and high temperature sintering. The results show that quinoline in the TiO2 paste is retained within the electrode structure in comparison to piperidine and pyridine after a short thermal treatment of 150 °C for 15 minutes. The …
Pre-Differentiation Of Human Neural Stem Cells Into Gabaergic Neurons Prior To Transplant Results In Greater Repopulation Of The Damaged Brain And Accelerates Functional Recovery After Transient Ischemic Stroke, Hima C. S Abeysinghe, Laita Bokhari, Anita F. Quigley, Mahesh A. Choolani, Jerry Chan, Gregory J. Dusting, Jeremy M. Crook, Nao R. Kobayashi, Carli Roulston
Pre-Differentiation Of Human Neural Stem Cells Into Gabaergic Neurons Prior To Transplant Results In Greater Repopulation Of The Damaged Brain And Accelerates Functional Recovery After Transient Ischemic Stroke, Hima C. S Abeysinghe, Laita Bokhari, Anita F. Quigley, Mahesh A. Choolani, Jerry Chan, Gregory J. Dusting, Jeremy M. Crook, Nao R. Kobayashi, Carli Roulston
Australian Institute for Innovative Materials - Papers
2015 Abeysinghe et al. Introduction: Despite attempts to prevent brain injury during the hyperacute phase of stroke, most sufferers end up with significant neuronal loss and functional deficits. The use of cell-based therapies to recover the injured brain offers new hope. In the current study, we employed human neural stem cells (hNSCs) isolated from subventricular zone (SVZ), and directed their differentiation into GABAergic neurons followed by transplantation to ischemic brain. Methods: Pre-differentiated GABAergic neurons, undifferentiated SVZ-hNSCs or media alone were stereotaxically transplanted into the rat brain (n=7/group) 7 days after endothelin-1 induced stroke. Neurological outcome was assessed by neurological deficit …
Enhanced Electron Lifetimes In Dye-Sensitized Solar Cells Using A Di-Chromophoric Porphyrin: The Utility Of Inter-Molecular Forces, Long Zhao, Pawel W. Wagner, Holly Van Der Salm, Keith C. Gordon, Shogo Mori, Attila J. Mozer
Enhanced Electron Lifetimes In Dye-Sensitized Solar Cells Using A Di-Chromophoric Porphyrin: The Utility Of Inter-Molecular Forces, Long Zhao, Pawel W. Wagner, Holly Van Der Salm, Keith C. Gordon, Shogo Mori, Attila J. Mozer
Australian Institute for Innovative Materials - Papers
Electron lifetimes in dye-sensitized solar cells employing a porphyrin dye, an organic dye, a 1:1 mixture of the two dyes and a di-chromophoric dye design consisting of the two dyes using a non-conjugated linker were measured, suggesting that the dispersion force of the organic dyes has a significant detrimental effect on the electron lifetime and that the di-chromophoric design can be utilized to control the effect of the dispersion force.
Increased Upconversion Performance For Thin Film Solar Cells: A Trimolecular Composition, Yuen Yap Cheng, Andrew Nattestad, Tim F. Schulze, Rowan W. Macqueen, Burkhard Fückel, Klaus Lips, Gordon G. Wallace, Tony Khoury, Maxwell J. Crossley, Timothy W. Schmidt
Increased Upconversion Performance For Thin Film Solar Cells: A Trimolecular Composition, Yuen Yap Cheng, Andrew Nattestad, Tim F. Schulze, Rowan W. Macqueen, Burkhard Fückel, Klaus Lips, Gordon G. Wallace, Tony Khoury, Maxwell J. Crossley, Timothy W. Schmidt
Australian Institute for Innovative Materials - Papers
Photochemical upconversion based on triplet-triplet annihilation (TTA-UC) is employed to enhance the short-circuit currents generated by two varieties of thin-film solar cells, a hydrogenated amorphous silicon (a-Si:H) solar cell and a dye-sensitized solar cell (DSC). TTA-UC is exploited to harvest transmitted sub-bandgap photons, combine their energies and re-radiate upconverted photons back towards the solar cells. In the present study we employ a dual-emitter TTA-UC system which allows for significantly improved UC quantum yields as compared to the previously used single-emitter TTA systems. In doing so we achieve record photo-current enhancement values for both the a-Si:H device and the DSC, surpassing …
Electrical Stimulation Using Conductive Polymer Polypyrrole Promotes Differentiation Of Human Neural Stem Cells: A Biocompatible Platform For Translational Neural Tissue Engineering, Elise Stewart, Nao R. Kobayashi, Michael J. Higgins, Anita Quigley, Sina S. Jamali, Simon Moulton, Robert M. I Kapsa, Gordon G. Wallace, Jeremy M. Crook
Electrical Stimulation Using Conductive Polymer Polypyrrole Promotes Differentiation Of Human Neural Stem Cells: A Biocompatible Platform For Translational Neural Tissue Engineering, Elise Stewart, Nao R. Kobayashi, Michael J. Higgins, Anita Quigley, Sina S. Jamali, Simon Moulton, Robert M. I Kapsa, Gordon G. Wallace, Jeremy M. Crook
Australian Institute for Innovative Materials - Papers
Conductive polymers (CPs) are organic materials that hold great promise for biomedicine. Potential applications include in vitro or implantable electrodes for excitable cell recording and stimulation, and conductive scaffolds for cell support and tissue engineering. Here we demonstrate the utility of electroactive CP Polypyrrole (PPy) containing the anionic dopant dodecylbenzenesulfonate (DBS) to differentiate novel clinically relevant human neural stem cells (hNSCs). Electrical stimulation of PPy(DBS) induced hNSCs to predominantly β-III Tubulin (Tuj1) expressing neurons, with lower induction of glial fibrillary acidic protein (GFAP) expressing glial cells. In addition, stimulated cultures comprised nodes or clusters of neurons with longer neurites and …
Mesoporous Hierarchical Anatase For Dye-Sensitized Solar Cells Achieving Over 10% Conversion Efficiency, Jianjian Lin, Yoon-Uk Heo, Andrew Nattestad, Yusuke Yamauchi, S X. Dou, Jung Ho Kim
Mesoporous Hierarchical Anatase For Dye-Sensitized Solar Cells Achieving Over 10% Conversion Efficiency, Jianjian Lin, Yoon-Uk Heo, Andrew Nattestad, Yusuke Yamauchi, S X. Dou, Jung Ho Kim
Australian Institute for Innovative Materials - Papers
Interest in both one-dimensional and hierarchical architectures of metal oxide semiconductors has intensified within the field of materials science over recent years. Herein, a new mesoporous anatase TiO2 architecture that combines these two concepts, as it is composed of individual, high-aspect-ratio, nanoribbon-like components, was synthesized via a facile hydrothermal method without any surfactant or template. An 8.3% solar-to-electric conversion efficiency was obtained when these structures were used in photoanodes for dye-sensitized solar cells, which are superior to commercial state-of-the-art TiO2 (6.6%), due to enhanced dye loading and efficient light scattering. To further improve the light scattering effect, a …
The Potential Of Induced Pluripotent Stem Cells In Models Of Neurological Disorders: Implications On Future Therapy, Jeremy M. Crook, Gordon G. Wallace, Eva Tomaskovic-Crook
The Potential Of Induced Pluripotent Stem Cells In Models Of Neurological Disorders: Implications On Future Therapy, Jeremy M. Crook, Gordon G. Wallace, Eva Tomaskovic-Crook
Australian Institute for Innovative Materials - Papers
There is an urgent need for new and advanced approaches to modeling the pathological mechanisms of complex human neurological disorders. This is underscored by the decline in pharmaceutical research and development efficiency resulting in a relative decrease in new drug launches in the last several decades. Induced pluripotent stem cells represent a new tool to overcome many of the shortcomings of conventional methods, enabling live human neural cell modeling of complex conditions relating to aberrant neurodevelopment, such as schizophrenia, epilepsy and autism as well as age-associated neurodegeneration. This review considers the current status of induced pluripotent stem cell-based modeling of …
N719- And D149-Sensitized 3d Hierarchical Rutile Tio2 Solar Cells - A Comparative Study, Jianjian Lin, Yoon-Uk Heo, Andrew Nattestad, Mohammed Shahabuddin, Yusuke Yamauchi, Jung Ho Kim
N719- And D149-Sensitized 3d Hierarchical Rutile Tio2 Solar Cells - A Comparative Study, Jianjian Lin, Yoon-Uk Heo, Andrew Nattestad, Mohammed Shahabuddin, Yusuke Yamauchi, Jung Ho Kim
Australian Institute for Innovative Materials - Papers
Poor dye loading on rutile TiO2 is one of the chief reasons for lower solar-to-electric conversion efficiency (η) in dye-sensitized solar cells (DSCs), compared to their anatase based counterparts. Previously, we showed that similar light harvesting for both rutile and anatase was realized by using a metal-free organic indoline dye, D149 [Sci. Rep., 2014, 4, 5769]. This was in contrast to the bulk of previous studies, which employed ruthenium based N719, leading to significant differences in light harvesting. To date, there has been no report directly comparing N719 and D149 for rutile based DSCs. In this work, three-dimensional hierarchical …
Boosting The Efficiency Of Quantum Dot Sensitized Solar Cells Up To 7.11% Through Simultaneous Engineering Of Photocathode And Photoanode, Yang Bai, Chao Han, Xinqi Chen, Hua Yu, Xu Zong, Zhen Li, Lianzhou Wang
Boosting The Efficiency Of Quantum Dot Sensitized Solar Cells Up To 7.11% Through Simultaneous Engineering Of Photocathode And Photoanode, Yang Bai, Chao Han, Xinqi Chen, Hua Yu, Xu Zong, Zhen Li, Lianzhou Wang
Australian Institute for Innovative Materials - Papers
We demonstrate a new strategy of boosting the efficiency of quantum dot sensitized solar cells (QDSSCs) by engineering the photocathode and photoanode simultaneously. Nanostructured photocathodes based on non-stoichiometric Cu2-xSe electrocatalysts were developed via a simple and scalable approach for CdS/CdSe QDs co-sensitized solar cells. Compared to Cu2S CE, remarkably improved photovoltaic performance was achieved for QDSSCs with Cu2-xSe CEs. The superior catalytic activity and electrical conductivity of Cu2-xSe CEs were verified by the electrochemical impedance spectra and Tafel-polarization measurements. To maximize the efficiency enhancement, the photoanodes were optimized by introducing a pillared …
3d Braided Yarns To Create Electrochemical Cells, Chen Zhao, Syamak Farajikhah, Caiyun Wang, Javad Foroughi, Xiaoteng Jia, Gordon G. Wallace
3d Braided Yarns To Create Electrochemical Cells, Chen Zhao, Syamak Farajikhah, Caiyun Wang, Javad Foroughi, Xiaoteng Jia, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
The demands for new configurations of electrochemical cells continue to grow and novel approaches are being enabled by the advent of new electromaterials and novel fabrication strategies. Wearable energy storage devices that can be seamlessly integrated into garments are a critical component of the wearable electronics genre. Recently, flexible yarn supercapacitors have attracted significant attention due to their ability to be integrated into fabrics, or stitched into existing textiles. Large-scale production of yarn supercapacitors using conventional manufacturing processes, however, is still a challenge. Here, we introduce the use of braiding technology to achieve a predetermined arrangement of fibre electrodes, the …
Trap-Assisted Transport And Non-Uniform Charge Distribution In Sulphur-Rich Pbs Colloidal Quantum Dot-Based Solar Cells With Selective Contacts, Victor Malgras, Guanran Zhang, Andrew Nattestad, Tracey M. Clarke, Attila J. Mozer, Yusuke Yamauchi, Jung Ho Kim
Trap-Assisted Transport And Non-Uniform Charge Distribution In Sulphur-Rich Pbs Colloidal Quantum Dot-Based Solar Cells With Selective Contacts, Victor Malgras, Guanran Zhang, Andrew Nattestad, Tracey M. Clarke, Attila J. Mozer, Yusuke Yamauchi, Jung Ho Kim
Australian Institute for Innovative Materials - Papers
This study reports evidences of dispersive transport in planar PbS colloidal quantum dots heterojunction-based devices as well as the effect of incorporating a MoO3 hole selective layer on the charge extraction behavior. Steady state and transient characterization techniques are employed to determine the complex recombination processes involved in such devices. The addition of a selective contact drastically improves the device efficiency up to 3.15 % (especially through the photocurrent and series resistance) and extends the overall charge lifetime by suppressing the main first-order recombination pathway observed in device without MoO3. The lifetime and mobility calculated for our sulphur-rich PbS-based devices …
Graphene-Based Nanocomposites For Energy Storage And Conversion In Lithium Batteries, Supercapacitors And Fuel Cells, Nasir Mahmood, Chenzhen Zhang, Han Yin, Yanglong Hou
Graphene-Based Nanocomposites For Energy Storage And Conversion In Lithium Batteries, Supercapacitors And Fuel Cells, Nasir Mahmood, Chenzhen Zhang, Han Yin, Yanglong Hou
Australian Institute for Innovative Materials - Papers
Due to their unique properties, together with their ease of synthesis and functionalization, graphene-based materials have been showing great potential in energy storage and conversion. These hybrid structures display excellent material characteristics, including high carrier mobility, faster recombination rate and long-time stability. In this review, after a short introduction to graphene and its derivatives, we summarize the recent advances in the synthesis and applications of graphene and its derivatives in the fields of energy storage (lithium ion, lithium-air, lithium-sulphur batteries and supercapacitors) and conversion (oxygen reduction reaction for fuel cells). This article further highlights the working principles and problems hindering …
Highly Connected Hierarchical Textured Tio2 Spheres As Photoanodes For Dye-Sensitized Solar Cells, Jianjian Lin, Andrew Nattestad, Hua Yu, Yang Bai, Lianzhou Wang, S X. Dou, Jung Ho Kim
Highly Connected Hierarchical Textured Tio2 Spheres As Photoanodes For Dye-Sensitized Solar Cells, Jianjian Lin, Andrew Nattestad, Hua Yu, Yang Bai, Lianzhou Wang, S X. Dou, Jung Ho Kim
Australian Institute for Innovative Materials - Papers
We present a new type of microstructured TiO2 sea urchin-like assembly, composed of high aspect-ratio nanosheets. We also demonstrate the applicability of these structures as photoanodes in dye-sensitized solar cells, with 9.0% conversion efficiency realized, a considerable improvement over the commercial Dyesol paste (8.2%) under the same conditions. We reveal that this new TiO2 nanostructure is beneficial to enhanced dye loading and efficient light scattering. In particular, the interpenetrating individual sheets of the spheres result in more intimate interparticle connections and provide efficient electron transfer pathways.
Chondrogenesis Of Infrapatellar Fat Pad Derived Adipose Stem Cells In 3d Printed Chitosan Scaffold, Ken Ye, Raed Felimban, Kathy Traianedes, Simon E. Moulton, Gordon G. Wallace, Johnson Chung, Anita Quigley, Peter F. M Choong, Damian E. Myers
Chondrogenesis Of Infrapatellar Fat Pad Derived Adipose Stem Cells In 3d Printed Chitosan Scaffold, Ken Ye, Raed Felimban, Kathy Traianedes, Simon E. Moulton, Gordon G. Wallace, Johnson Chung, Anita Quigley, Peter F. M Choong, Damian E. Myers
Australian Institute for Innovative Materials - Papers
Infrapatellar fat pad adipose stem cells (IPFP-ASCs) have been shown to harbor chondrogenic potential. When combined with 3D polymeric structures, the stem cells provide a source of stem cells to engineer 3D tissues for cartilage repair. In this study, we have shown human IPFP-ASCs seeded onto 3D printed chitosan scaffolds can undergo chondrogenesis using TGFβ3 and BMP6. By week 4, a pearlescent, cartilage-like matrix had formed that penetrated the top layers of the chitosan scaffold forming a 'cap' on the scaffold. Chondrocytic morphology showed typical cells encased in extracellular matrix which stained positively with toluidine blue. Immunohistochemistry demonstrated positive staining …
Enhanced Performance Of Dye-Sensitized Solar Cells Using Carbazole-Substituted Di-Chromophoric Porphyrin Dyes, Long Zhao, Pawel Wagner, Anastasia Elliott, Matthew Griffith, Tracey M. Clarke, Keith C. Gordon, Shogo Mori, Attila Mozer
Enhanced Performance Of Dye-Sensitized Solar Cells Using Carbazole-Substituted Di-Chromophoric Porphyrin Dyes, Long Zhao, Pawel Wagner, Anastasia Elliott, Matthew Griffith, Tracey M. Clarke, Keith C. Gordon, Shogo Mori, Attila Mozer
Australian Institute for Innovative Materials - Papers
The purpose of this work is to investigate the origin of improved photovoltaic performance of a series of di-chromophoric carbazole-substituted porphyrin dyes employed as sensitizers in dye-sensitized solar cells. Five di-chromophoric zinc porphyrin dyes with the same porphyrin core, a carbazole unit attached in the meso-position through a phenylethenyl linkage, and substituents spanning a range of electron affinities, in an attempt to tune the electronic level of the carbazole unit, have been synthesized (CZPs). Density functional theory (DFT) calculations predicted the nature of the electronic transitions observed in the CZP systems, showing a large degree of orbital mixing. In contrast, …
3d Hierarchical Rutile Tio2 And Metal-Free Organic Sensitizer Producing Dye-Sensitized Solar Cells 8.6% Conversion Efficiency, Jianjian Lin, Yoon-Uk Heo, Andrew Nattestad, Ziqi Sun, Lianzhou Wang, Jung Ho Kim, S X. Dou
3d Hierarchical Rutile Tio2 And Metal-Free Organic Sensitizer Producing Dye-Sensitized Solar Cells 8.6% Conversion Efficiency, Jianjian Lin, Yoon-Uk Heo, Andrew Nattestad, Ziqi Sun, Lianzhou Wang, Jung Ho Kim, S X. Dou
Australian Institute for Innovative Materials - Papers
Three-dimensional (3D) hierarchical nanoscale architectures comprised of building blocks, with specifically engineered morphologies, are expected to play important roles in the fabrication of 'next generation' microelectronic and optoelectronic devices due to their high surface-to-volume ratio as well as opto-electronic properties. Herein, a series of well-defined 3D hierarchical rutile TiO2 architectures (HRT) were successfully prepared using a facile hydrothermal method without any surfactant or template, simply by changing the concentration of hydrochloric acid used in the synthesis. The production of these materials provides, to the best of our knowledge, the first identified example of a ledgewise growth mechanism in a rutile …
Morphology-Controllable 1d-3d Nanostructured Tio2 Bilayer Photoanodes For Dye-Sensitized Solar Cells, Ziqi Sun, Jung Ho Kim, Yue Zhao, Darren Attard, S X. Dou
Morphology-Controllable 1d-3d Nanostructured Tio2 Bilayer Photoanodes For Dye-Sensitized Solar Cells, Ziqi Sun, Jung Ho Kim, Yue Zhao, Darren Attard, S X. Dou
Australian Institute for Innovative Materials - Papers
Morphology-controlled bilayer TiO2 nanostructures consisting of one-dimensional (1D) nanowire bottom arrays and a three-dimensional (3D) dendritic microsphere top layer were synthesized via a one-step hydrothermal method. These novel 1D-3D bilayer photoanodes demonstrated the highest energy conversion efficiency of 7.2% for rutile TiO2 dye-sensitized solar cells to date, with TiCl4 post-treatment.
The Effect Of Microscopic Texture On The Direct Plasma Surface Passivation Of Si Solar Cells, S Mehrabian, S Xu, A A. Qaemi, B Shokri, C Chan, K Ostrikov
The Effect Of Microscopic Texture On The Direct Plasma Surface Passivation Of Si Solar Cells, S Mehrabian, S Xu, A A. Qaemi, B Shokri, C Chan, K Ostrikov
Australian Institute for Innovative Materials - Papers
Textured silicon surfaces are widely used in manufacturing of solar cells due to increasing the light absorption probability and also the antireflection properties. However, these Si surfaces have a high density of surface defects that need to be passivated. In this study, the effect of the microscopic surface texture on the plasma surface passivation of solar cells is investigated. The movement of 105Hþ ions in the texture-modified plasma sheath is studied by Monte Carlo numerical simulation. The hydrogen ions are driven by the combined electric field of the plasma sheath and the textured surface. The ion dynamics is simulated, and …
Porous Titania Nanosheet/Nanoparticle Hybrids As Photoanodes For Dye-Sensitized Solar Cells, Yang Bai, Zheng Xing, Hua Yu, Zhen Li, Rose Amal, Lianzhou Wang
Porous Titania Nanosheet/Nanoparticle Hybrids As Photoanodes For Dye-Sensitized Solar Cells, Yang Bai, Zheng Xing, Hua Yu, Zhen Li, Rose Amal, Lianzhou Wang
Australian Institute for Innovative Materials - Papers
Porous titania nanohybrids (NHs) were successfully prepared by hybridizing the exfoliated titania nanosheets with anatase TiO2 nanoparticles. Various characterizations revealed that the titania NHs as photoanodes play a trifunctional role (light harvesting, dye adsorption, and electron transfer) in improving the efficiency (η) of the dye-sensitized solar cells. The optimized photoanode consisting layered NHs demonstrated a high overall conversion efficiency of 10.1%, remarkably enhanced by 29.5% compared to that (7.8%) obtained from the benchmark P25 nanoparticles under the same testing conditions.
Structurally Stabilized Mesoporous Tio2 Nanofibres For Efficient Dye-Sensitized Solar Cells, Fargol Hasani Bijarbooneh, Yue Zhao, Ziqi Sun, Yoon-Uk Heo, Victor Malgras, Jung Ho Kim, S X. Dou
Structurally Stabilized Mesoporous Tio2 Nanofibres For Efficient Dye-Sensitized Solar Cells, Fargol Hasani Bijarbooneh, Yue Zhao, Ziqi Sun, Yoon-Uk Heo, Victor Malgras, Jung Ho Kim, S X. Dou
Australian Institute for Innovative Materials - Papers
One-dimensional (1D) TiO2 nanostructures are very desirable for providing fascinating properties and features, such as high electron mobility, quantum confinement effects, and high specific surface area. Herein, 1D mesoporous TiO2 nanofibres were prepared using the electrospinning method to verify their potential for use as the photoelectrode of dye-sensitized solar cells (DSSCs). The 1D mesoporous nanofibres, 300 nm in diameter and 10-20 μm in length, were aggregated from anatase nanoparticles 20-30 nm in size. The employment of these novel 1D mesoporous nanofibres significantly improved dye loading and light scattering of the DSSC photoanode, and resulted in conversion cell efficiency of 8.14%, …
Cation Exchange At Semiconducting Oxide Surfaces: Origin Of Light-Induced Performance Increases In Porphyrin Dye-Sensitized Solar Cells, Matthew J. Griffith, Kenji Sunahara, Akihiro Furube, Attila J. Mozer, David L. Officer, Pawel Wagner, Gordon G. Wallace, Shogo Mori
Cation Exchange At Semiconducting Oxide Surfaces: Origin Of Light-Induced Performance Increases In Porphyrin Dye-Sensitized Solar Cells, Matthew J. Griffith, Kenji Sunahara, Akihiro Furube, Attila J. Mozer, David L. Officer, Pawel Wagner, Gordon G. Wallace, Shogo Mori
Australian Institute for Innovative Materials - Papers
The origin of simultaneous improvements in the short-circuit current density (Jsc) and open-circuit voltage (Voc) of porphyrin dye-sensitized TiO2 solar cells following white light illumination was studied by systematic variation of several different device parameters. Reduction of the dye surface loading resulted in greater relative performance enhancements, suggesting open space at the TiO2 surface expedites the process. Variation of the electrolyte composition and subsequent analysis of the conduction band potential shifts suggested that a light-induced replacement of surface-adsorbed lithium (Li+) ions with dimethylpropylimidazolium (DMPIm+) ions was responsible for an increased electron lifetime by decreasing the recombination with the redox mediator. …
An Overview - Functional Nanomaterials For Lithium Rechargeable Batteries, Supercapacitors, Hydrogen Storage, And Fuel Cells, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
There is tremendous worldwide interest in functional nanostructured materials, which are the advanced nanotechnology materials with internal or external dimensions on the order of nanometers. Their extremely small dimensions make these materials unique and promising for clean energy applications such as lithium ion batteries, supercapacitors, hydrogen storage, fuel cells, and other applications. This paper will highlight the development of new approaches to study the relationships between the structure and the physical, chemical, and electrochemical properties of functional nanostructured materials. The Energy Materials Research Programme at the Institute for Superconducting and Electronic Materials, the University of Wollongong, has been focused on …
A Study Of Tio2 Binder-Free Paste Prepared For Low Temperature Dye-Sensitized Solar Cells, Jeremy H. Yune, Inna Karatchevtseva, Gerri Triani, Klaudia Wagner, David Officer
A Study Of Tio2 Binder-Free Paste Prepared For Low Temperature Dye-Sensitized Solar Cells, Jeremy H. Yune, Inna Karatchevtseva, Gerri Triani, Klaudia Wagner, David Officer
Australian Institute for Innovative Materials - Papers
A binder-free titania paste was prepared by chemical modification of an acidic TiO2 sol with ammonia. By varying the ammonia concentration, the viscosity of the acidic TiO2 suspension increased, thereby allowing uniform films to be cast. The photoelectrochemical performance of TiO2 electrodes, cast as single layers, was dependent on the thermal treatment cycle. Fourier transform infrared spectroscopy was used to characterize the extent of residual organics and found that acetates from the TiO2 precursor preparation were retained within the electrode structure after thermal treatment at 150 °C. Electrodes of nominal thickness 4 lm produced an energy conversion efficiency as high …
Bio-Ink Properties And Printability For Extrusion Printing Living Cells, Johnson H. Y Chung, Sina Naficy, Zhilian Yue, Robert Kapsa, Anita Quigley, Simon E. Moulton, Gordon G. Wallace
Bio-Ink Properties And Printability For Extrusion Printing Living Cells, Johnson H. Y Chung, Sina Naficy, Zhilian Yue, Robert Kapsa, Anita Quigley, Simon E. Moulton, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
Additive biofabrication (3D bioprinting) makes it possible to create scaffolds with precise geometries, control over pore interconnectivity and architectures that are not possible with conventional techniques. Inclusion of cells within the ink to form a “bio-ink” presents the potential to print 3D structures that can be implanted into damaged/diseased tissue to promote highly controlled cell-based regeneration and repair. The properties of an ‘ink’ are defined by its formulation and critically influence the delivery and integrity of structure formed. Importantly, the ink properties need to conform to biological requirements necessary for the cell system that they are intended to support and …