Open Access. Powered by Scholars. Published by Universities.®

Nanoscience and Nanotechnology Commons

Open Access. Powered by Scholars. Published by Universities.®

1,896 Full-Text Articles 3,331 Authors 394,571 Downloads 35 Institutions

All Articles in Nanoscience and Nanotechnology

Faceted Search

1,896 full-text articles. Page 1 of 66.

Structural And Catalytic Differences In The Effect Of Co And Mo As Promoters For Pt-Based Aqueous Phase Reforming Catalysts, Paul J. Dietrich, Fred G. Sollberger, M. Cem Akatay, Eric A. Stach, W.Nicholas Delgass, Jeffrey T. Miller, Fabio H. Ribeiro 2014 Purdue University

Structural And Catalytic Differences In The Effect Of Co And Mo As Promoters For Pt-Based Aqueous Phase Reforming Catalysts, Paul J. Dietrich, Fred G. Sollberger, M. Cem Akatay, Eric A. Stach, W.Nicholas Delgass, Jeffrey T. Miller, Fabio H. Ribeiro

Birck and NCN Publications

Reaction rates (site time yields, normalized to CO chemisorption sites) and product selectivity were determined for PtCo, PtMo, and Pt supported on multi-walled carbon nanotubes for aqueous phase reforming of glycerol. The bimetallic PtCo and PtMo catalysts had 4.6x and 5.4x higher glycerol consumption rates than Pt, and 3.9x and 0.6x rates in H-2 formation compared to Pt. Hydrogen generation selectivity was similar on Pt and PtCo, but PtMo had an increase in selectivity to C-O cleavage products, which reduced H-2 yield at conversions over 60% (85-90% hydrogen yield for Pt and PtCo, 65% for PtMo ...


Size-Dependent Electroelastic Properties Of Piezoelectric Nanoplates, Zhengrong Zhang 2014 Western University

Size-Dependent Electroelastic Properties Of Piezoelectric Nanoplates, Zhengrong Zhang

University of Western Ontario - Electronic Thesis and Dissertation Repository

With the development of nanotechnology, piezoelectric nanostructures have attracted a surge of interests in research communities for the potential applications as transistors, sensors, actuators, resonators and energy harvesters in nanoelectromechanical systems (NEMS) due to their high electromechanical coupling and unique features at the nano-scale. Piezoelectric nanomaterials have been characterized to possess size-dependent electromechanical coupling properties from both experimental and theoretical perspectives. Therefore it is of great importance to investigate the physical mechanisms of these distinct nano-scale structure features in order to fulfill the design and application of those piezoelectricity-based nanodevices.

Due to large surface to volume ratio and manifest strain ...


Au@Tio2 Nanocomposites For The Catalytic Degradation Of Methyl Orange And Methylene Blue: An Electron Relay Effect, Mohammad Mansoob Khan Dr, J. Lee, M. H. Cho 2014 SelectedWorks

Au@Tio2 Nanocomposites For The Catalytic Degradation Of Methyl Orange And Methylene Blue: An Electron Relay Effect, Mohammad Mansoob Khan Dr, J. Lee, M. H. Cho

Dr. Mohammad Mansoob Khan

Au@TiO2 nanocomposites were used for the catalytic degradation of methyl orange and methylene blue by NaBH4. A detail pathway for step by step reduction, oxidation and complete mineralization of intermediates into the respective end-products was established by UV-vis spectroscopy, chemical oxygen demand, ion chromatography and cyclic voltammetry (CV). CV studies confirmed that the dyes were reduced and oxidized to the end-products by NaBH4 in the presence of Au@TiO2 nanocomposites and O2•, •OH and HO2• radicals generated in-situ. Results suggest that Au@TiO2 nanocomposites not only assist in the decolorization of dyes, but also promote their complete mineralization into ...


Highly Visible Light Active Ag@Zno Nanocomposites Synthesized By Gel-Combustion Route, Mohammad Mansoob Khan Dr, S. A. Ansari, J. Lee, M. H. Cho 2014 SelectedWorks

Highly Visible Light Active Ag@Zno Nanocomposites Synthesized By Gel-Combustion Route, Mohammad Mansoob Khan Dr, S. A. Ansari, J. Lee, M. H. Cho

Dr. Mohammad Mansoob Khan

Highly visible light active 1% and 3% Ag@ZnO nanocomposites were synthesized via a gel combustion route using citric acid as a fuel. The formation of the nanocomposites with enhanced properties was confirmed using a range of characterization techniques, photocatalysis and photoelectrochemical studies. Compared to the pristine ZnO nanoparticles, the Ag@ZnO nanocomposites exhibited enhanced visible light photocatalytic activity for the degradation of methylene blue and photoelectrochemical response. A mechanism was proposed to account for the photocatalytic activities of the Ag@ZnO nanocomposite that showed the surface plasmon resonance (SPR) of Ag is an effective way of enhancing the visible ...


Opto-Electronic Devices With Nanoparticles And Their Assemblies, Chieu Van Nguyen 2014 University of Nebraska - Lincoln

Opto-Electronic Devices With Nanoparticles And Their Assemblies, Chieu Van Nguyen

Chemical & Biomolecular Engineering Theses, Dissertations, & Student Research

Nanotechnology is a fast growing field; engineering matters at the nano-meter scale. A key nanomaterial is nanoparticles (NPs). These sub-wavelength (< 100nm) particles provide tremendous possibilities due to their unique electrical, optical, and mechanical properties. Plethora of NPs with various chemical composition, size and shape has been synthesized. Clever designs of sub-wavelength structures enable observation of unusual properties of materials, and have led to new areas of research such as metamaterials. This dissertation describes two self-assemblies of gold nanoparticles, leading to an ultra-soft thin film and multi-functional single electron device at room temperature. First, the layer-by-layer self-assembly of 10nm Au nanoparticles and polyelectrolytes is shown to behave like a cellular-foam with modulus below 100 kPa. As a result, the composite thin film (~ 100nm) is 5 orders of magnitude softer than an equally thin typical polymer film. The thin film can be compressed reversibly to 60% strain. The extraordinarily low modulus and high compressibility are advantageous in pressure sensing applications. The unique mechanical properties of the composite film lead to development of an ultra-sensitive tactile imaging device capable of screening for breast cancer. On par with human finger sensitivity, the tactile device can detect a 5mm imbedded object up to 20mm below the surface with low background noise. The second device is based on a one-dimensional (1-D) self-directed self-assembly of Au NPs mediated by dielectric materials. Depending on the coverage density of the Au NPs assembly deposited on the device, electronic emission was observed at ultra-low bias of 40V, leading to low-power plasma generation in air at atmospheric pressure. Light emitted from the plasma is apparent to the naked eyes. Similarly, 1-D self-assembly of Au NPs mediated by iron oxide was fabricated and exhibits ferro-magnetic behavior. The multi-functional 1-D self-assembly of Au NPs has great potential in modern electronics such as solid state lighting, plasma-based nanoelectronics, and memory devices.

Adviser: Ravi F. Saraf


In-Situ Fluorescent Immunomagnetic Multiplex Detection Of Foodborne Pathogens In Very Low Numbers, Il-Hoon Cho, Lisa Mauer, Joseph Irudayaraj 2014 Purdue University

In-Situ Fluorescent Immunomagnetic Multiplex Detection Of Foodborne Pathogens In Very Low Numbers, Il-Hoon Cho, Lisa Mauer, Joseph Irudayaraj

Birck and NCN Publications

Consumption of foods contaminated with pathogenic bacteria is a major public health concern. Foods contain microorganisms, the overwhelming majority of which are nonpathogenic, some are responsible for food spoilage, and some cause serious illness leading to death or a variety of diseases in humans. The key challenge in food safety is to rapidly screen foods to determine the presence of pathogens so that appropriate intervention protocols can be pursued. A simple fluorometric immunological method in combination with a magnetic concentration step was developed for rapid detection of target bacteria with high sensitivity and specificity in less than 2 h without ...


Electronic Transport In Ingaas/Al2o3 Nfinfets, Shengwei Li, Yaodong Hu, Yangqing Wu, Daming Huang, Peide D. Ye, Ming-Fu Li 2014 Purdue University

Electronic Transport In Ingaas/Al2o3 Nfinfets, Shengwei Li, Yaodong Hu, Yangqing Wu, Daming Huang, Peide D. Ye, Ming-Fu Li

Birck and NCN Publications

Based on the multiple subbands quasi-ballistic transport theory, we investigate the electronic transport of nano size In0.53Ga0.47As nFinFETs with Al2O3 gate dielectric, emphasizing the saturation current region. 1D mobile charge density and gate capacitance density are introduced for the first time to describe the nano-FinFET transport property under volume inversion. With the extracted effective channel mobility of electrons in the linear region from our experiments, the electron mean free path. in the channel with the value of 5-9 nm is obtained. With only one fitting parameter alpha = 0.31 for the critical length l = L(kT/q/v ...


Ultrafast And Scalable Laser Liquid Synthesis Of Tin Oxide Nanotubes And Its Application In Lithium Ion Batteries, Zhikun Liu, Zeyuan Cao, Biwei Deng, Yuefeng Wang, Jiayi Shao, Prashant Kumar, C. Richard Liu, Bingqing Wei, Gary Cheng 2014 Purdue University

Ultrafast And Scalable Laser Liquid Synthesis Of Tin Oxide Nanotubes And Its Application In Lithium Ion Batteries, Zhikun Liu, Zeyuan Cao, Biwei Deng, Yuefeng Wang, Jiayi Shao, Prashant Kumar, C. Richard Liu, Bingqing Wei, Gary Cheng

Birck and NCN Publications

Laser-induced photo-chemical synthesis of SnO2 nanotubes has been demonstrated by employing a nanoporous polycarbonate membrane as a template. The SnO2 nanotube diameter can be controlled by the nanoporous template while the nanotube length can be tuned by laser parameters and reaction duration. The microstructure characterization of the nanotubes indicates that they consist of mesoporous structures with sub 5 nm size nanocrystals connected by the twinning structure. The application of SnO2 nanotubes as an anode material in lithium ion batteries has also been explored, and they exhibited high capacity and excellent cyclic stability. The laser based emerging technique for scalable production ...


Surface Topography And Chemistry Shape Cellular Behavior On Wide Band-Gap Semiconductors, Lauren E. Bain, Ramon Collazo, Shu-han Hsu, Nicole Pfiester Latham, Michael J. Manfra, Albena Ivanisevic 2014 Purdue University

Surface Topography And Chemistry Shape Cellular Behavior On Wide Band-Gap Semiconductors, Lauren E. Bain, Ramon Collazo, Shu-Han Hsu, Nicole Pfiester Latham, Michael J. Manfra, Albena Ivanisevic

Birck and NCN Publications

The chemical stability and electrical properties of gallium nitride make it a promising material for the development of biocompatible electronics, a range of devices including biosensors as well as interfaces for probing and controlling cellular growth and signaling. To improve the interface formed between the probe material and the cell or biosystem, surface topography and chemistry can be applied to modify the ways in which the device interacts with its environment. PC12 cells are cultured on as-grown planar, unidirectionally polished, etched nanoporous and nanowire GaN surfaces with and without a physi-sorbed peptide sequence that promotes cell adhesion. While cells demonstrate ...


Technique For Quantitative Mapping Of Three-Dimensional Liquid-Gas Phase Boundaries In Microchannel Flows, Ravi S. Patel, Suresh V. Garimella 2014 Purdue University

Technique For Quantitative Mapping Of Three-Dimensional Liquid-Gas Phase Boundaries In Microchannel Flows, Ravi S. Patel, Suresh V. Garimella

Birck and NCN Publications

A diagnostic technique capable of characterizing interfaces between transparent, immiscible fluids is developed and demonstrated by investigating the morphology of liquid-gas interfaces in an adiabatic two-phase flow through a microchannel of 500 mu m x 500 mu m square cross section. Water seeded with 0.5 mu m-diameter fluorescent polystyrene particles is pumped through the channel, and the desired adiabatic two-phase flow regime is achieved through controlled air injection. The diagnostic technique relies on obtaining particle position data through epifluorescent imaging of the flow at excitation and emission wavelengths of 532 nm and 620 nm, respectively. The particle position data ...


Developent Of A Phospholipid Encapsulation Process For Quantum Dots To Be Used In Biologic Applications, Logan Grimes 2014 California Polytechnic State University

Developent Of A Phospholipid Encapsulation Process For Quantum Dots To Be Used In Biologic Applications, Logan Grimes

Master's Theses and Project Reports

The American Cancer Society predicts that 1,665,540 people will be diagnosed with cancer, and 585,720 people will die from cancer in 2014. One of the most common types of cancer in the United States is skin cancer. Melanoma alone is predicted to account for 10,000 of the cancer related deaths in 2014. As a highly mobile and aggressive form of cancer, melanoma is difficult to fight once it has metastasized through the body. Early detection in such varieties of cancer is critical in improving survival rates in afflicted patients. Present methods of detection rely on visual ...


Spin Blockade And Exchange In Coulomb-Confined Silicon Double Quantum Dots, Bent Weber, Y.H. Matthias Tan, Suddhasatta Mahapatra, Thomas F. Watson, Hoon Ryu, Rajib Rahman, Lloyd C.L. Hollenberg, Gerhard Klimeck, Michelle Y. Simmons 2014 Purdue University

Spin Blockade And Exchange In Coulomb-Confined Silicon Double Quantum Dots, Bent Weber, Y.H. Matthias Tan, Suddhasatta Mahapatra, Thomas F. Watson, Hoon Ryu, Rajib Rahman, Lloyd C.L. Hollenberg, Gerhard Klimeck, Michelle Y. Simmons

Birck and NCN Publications

Electron spins confined to phosphorus donors in silicon are promising candidates as qubits(1) because of their long coherence times, exceeding seconds in isotopically purified bulk silicon(2). With the recent demonstrations of initialization, readout(3) and coherent manipulation(4) of individual donor electron spins, the next challenge towards the realization of a Si:P donor-based quantum computer is the demonstration of exchange coupling(1,5,6) in two tunnel-coupled phosphorus donors. Spin-to-charge conversion(3,7) via Pauli spin blockade(8,9), an essential ingredient for reading out individual spin states, is challenging in donor-based systems due to the inherently ...


A Single-Input, Single-Output Electromagnetically-Transduced Microresonator Array, Andrew B. Sabater, A. G. Hunkler, Jeff F. Rhoads 2014 Purdue University

A Single-Input, Single-Output Electromagnetically-Transduced Microresonator Array, Andrew B. Sabater, A. G. Hunkler, Jeff F. Rhoads

Birck and NCN Publications

Resonant microsystems have found broad applicability in environmental and inertial sensing, signal filtering and timing applications. Despite this breadth in utility, a common constraint on these devices is throughput, or the total amount of information that they can process. In recent years, elastically-coupled arrays of microresonators have been used to increase the throughput in sensing contexts, but these arrays are often more complicated to design than their isolated counterparts, due to the potential for collective behaviors (such as vibration localization) to arise. An alternative solution to the throughput constraint is to use arrays of electromagnetically-transduced microresonators. These arrays can be ...


Effect Of T-Dna Insertions On Mrna Transcript Copy Numbers Upstream And Downstream Of The Insertion Site In Arabidopsis Thaliana Explored By Surface Enhanced Raman Spectroscopy, Ulhas Kadam, Claudia A. Moeller, Joseph Irudayaraj, Burkhard Schulz 2014 Purdue University

Effect Of T-Dna Insertions On Mrna Transcript Copy Numbers Upstream And Downstream Of The Insertion Site In Arabidopsis Thaliana Explored By Surface Enhanced Raman Spectroscopy, Ulhas Kadam, Claudia A. Moeller, Joseph Irudayaraj, Burkhard Schulz

Birck and NCN Publications

We report the effect of a T-DNA insertion on the expression level of mRNA transcripts of the TWISTED DWARF 1 (TWD1) gene upstream and downstream of the T-DNA insertion site in Arabidopsis. A novel approach based on surface-enhanced Raman spectroscopy (SERS) was developed to detect and quantify the effect of a T-DNA insertion on mRNA transcript accumulation at 5'- and 3'-ends of the TWD1 gene. A T-DNA insertion mutant in the TWD1 gene (twd1-2) was chosen to test the sensitivity and the feasibility of the approach. The null mutant of the FK506-like immunophilin protein TWD1 in Arabidopsis shows severe ...


Bulk-Like Laminated Nitride Metal/Semiconductor Superlattices For Thermoelectric Devices, Jeremy L. Schroeder, David A. Ewoldt, Reja Amatya, Rajeev J. Ram, Ali Shakouri, Timothy D. Sands 2014 Purdue University

Bulk-Like Laminated Nitride Metal/Semiconductor Superlattices For Thermoelectric Devices, Jeremy L. Schroeder, David A. Ewoldt, Reja Amatya, Rajeev J. Ram, Ali Shakouri, Timothy D. Sands

Birck and NCN Publications

Bulk-like thermionic energy conversion devices have been fabricated from nanostructured nitride metal/semiconductor superlattices using a novel lamination process. 5-mu m thick (Hf0.5Zr0.5)N (6-nm)/ScN (6-nm) metal/semiconductor superlattices with a 12 nm period were deposited on 100-silicon substrates by reactive magnetron sputtering followed by a selective tetra methyl ammonium hydroxide substrate etching and a gold-gold lamination process to yield 300 mu m x 300 mu m x 290 mu m microscale thermionic energy conversion elements with 16,640 superlattice periods. The thermionic element had a Seebeck coefficient of -120 mu V/K at 800 K, an ...


All-Silicon Technology For High-Q Evanescent Mode Cavity Tunable Resonators And Filters, Muhammad Shoaib Arif, Dimitrios Peroulis 2014 Purdue University

All-Silicon Technology For High-Q Evanescent Mode Cavity Tunable Resonators And Filters, Muhammad Shoaib Arif, Dimitrios Peroulis

Birck and NCN Publications

This paper presents a new fabrication technology and the associated design parameters for realizing compact and widely-tunable cavity filters with a high unloaded quality factor (Q(u)) maintained throughout the analog tuning range. This all-silicon technology has been successfully employed to demonstrate tunable resonators in mobile form factors in the C, X, Ku, and K bands with simultaneous high unloaded quality factors (>= 500) and tuning ratios (>= 1: 2). It is shown that by employing high-precision micro-fabrication techniques and careful modeling, the measured RF and tuning performance of the fabricated device closely match the simulated results. The capability of monolithic (system-on-chip ...


Structure And Thermoelectric Properties Of Spark Plasma Sintered Ultrathin Pbte Nanowires, Scott W. Finefrock, Genqiang Zhang, Je-Hyeong Bahk, Haoran Yang, Ali Shakouri, Yue Wu 2014 Purdue University

Structure And Thermoelectric Properties Of Spark Plasma Sintered Ultrathin Pbte Nanowires, Scott W. Finefrock, Genqiang Zhang, Je-Hyeong Bahk, Haoran Yang, Ali Shakouri, Yue Wu

Birck and NCN Publications

Solution-synthesized thermoelectric nanostructured materials have the potential to have lower cost and higher performance than materials synthesized by solid-state methods. Herein we present the synthesis of ultrathin PbTe nanowires, which are compressed by spark plasma sintering at various temperatures in the range of 405-500 degrees C. The resulting discs possess grains with sizes of 5-30 mu m as well as grains with sizes on the order of the original 12 nm diameter PbTe nanowires. This micro- and nanostructure leads to a significantly reduced thermal conductivity compared to bulk PbTe. Careful electron transport analysis shows suppressed electrical conductivity due to increased ...


Epitaxial Superlattices With Titanium Nitride As A Plasmonic Component For Optical Hyperbolic Metamaterials, Gururaj V. Naik, Bivas Saha, Jing Liu, Sammy M. Saber, Eric A. Stach, Joseph Irudayaraj, Timothy D. Sands, Vladimir M. Shalaev, Alexandra Boltasseva 2014 Purdue University

Epitaxial Superlattices With Titanium Nitride As A Plasmonic Component For Optical Hyperbolic Metamaterials, Gururaj V. Naik, Bivas Saha, Jing Liu, Sammy M. Saber, Eric A. Stach, Joseph Irudayaraj, Timothy D. Sands, Vladimir M. Shalaev, Alexandra Boltasseva

Birck and NCN Publications

Titanium nitride (TiN) is a plasmonic material having optical properties resembling gold. Unlike gold, however, TiN is complementary metal oxide semiconductor-compatible, mechanically strong, and thermally stable at higher temperatures. Additionally, TiN exhibits low-index surfaces with surface energies that are lower than those of the noble metals which facilitates the growth of smooth, ultrathin crystalline films. Such films are crucial in constructing low-loss, high-performance plasmonic and metamaterial devices including hyperbolic metamaterials (HMMs). HMMs have been shown to exhibit exotic optical properties, including extremely high broad-band photonic densities of states (PDOS), which are useful in quantum plasmonic applications. However, the extent to ...


Ultraviolet Laser Crystallized Zno:Al Films On Sapphire With High Hall Mobility For Simultaneous Enhancement Of Conductivity And Transparency, Qiong Nian, Martin Y. Zhang, Bradley D. Schwartz, Gary J. Cheng 2014 Purdue University

Ultraviolet Laser Crystallized Zno:Al Films On Sapphire With High Hall Mobility For Simultaneous Enhancement Of Conductivity And Transparency, Qiong Nian, Martin Y. Zhang, Bradley D. Schwartz, Gary J. Cheng

Birck and NCN Publications

One of the most challenging issues in transparent conductive oxides (TCOs) is to improve their conductivity without compromising transparency. High conductivity in TCO films often comes from a high carrier concentration, which is detrimental to transparency due to free carrier absorption. Here we show that UV laser crystallization (UVLC) of aluminum-doped ZnO (AZO) films prepared by pulsed laser deposition on sapphire results in much higher Hall mobility, allowing relaxation of the constraints of the conductivity/transparency trade-off. X-ray diffraction patterns and morphological characterizations show grain growth and crystallinity enhancement during UVLC, resulting in less film internal imperfections. Optoelectronic measurements show ...


Experimental Demonstration Of Titanium Nitride Plasmonic Interconnects, Nathaniel Kinsey, Marcello Ferrera, Gururaj V. Naik, V. E. Babicheva, Vladimir M. Shalaev, Alexandra Boltasseva 2014 Purdue University

Experimental Demonstration Of Titanium Nitride Plasmonic Interconnects, Nathaniel Kinsey, Marcello Ferrera, Gururaj V. Naik, V. E. Babicheva, Vladimir M. Shalaev, Alexandra Boltasseva

Birck and NCN Publications

An insulator-metal-insulator plasmonic interconnect using TiN, a CMOS-compatible material, is proposed and investigated experimentally at the telecommunication wavelength of 1.55 mu m. The TiN waveguide was shown to obtain propagation losses less than 0.8 dB/mm with a mode size of 9.8 mu m on sapphire, which agree well with theoretical predictions. A theoretical analysis of a solid-state structure using Si3N4 superstrates and ultra-thin metal strips shows that propagation losses less than 0.3 dB/mm with a mode size of 9 mu m are attainable. This work illustrates the potential of TiN as a realistic plasmonic ...


Digital Commons powered by bepress