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- Aluminum nitride; Pulsed atomic-layer epitaxy; Dislocation density; Atomically-flat surface; Metal organic chemical vapor deposition (1)
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Articles 1 - 9 of 9
Full-Text Articles in Other Materials Science and Engineering
Synthesis, Characterisation, And Electrochemical Performance Of Efb-Derived Biochar-Metal Oxide Composite Electrodes For Hybrid Supercapacitors, Yogini Gunasekaran
Synthesis, Characterisation, And Electrochemical Performance Of Efb-Derived Biochar-Metal Oxide Composite Electrodes For Hybrid Supercapacitors, Yogini Gunasekaran
Student Works (2020-2029)
Supercapacitors are essential for energy storage due to their high-power density and longevity, particularly in increasing demand for sustainable energy. However, their low energy density and specific capacitance hinder widespread use. Advancements in next-generation electrode materials that are high-performing, cost-effective, and scalable are necessary to address these issues. Herein, this work reports the development of novel electrode materials and explores the fundamental relationship between their structural properties and electrochemical performance in supercapacitors. In this study, biochar was derived from oil palm Empty Fruit Bunch (EFB) via a gasification process. Different samples of metal oxide/biochar composites were subsequently synthesized using a …
Synthesis And Performance Evaluation Of Zeolite-Based Ni–Cao For Integrated Co2 Capture And Conversion, Zhang Xinggang
Synthesis And Performance Evaluation Of Zeolite-Based Ni–Cao For Integrated Co2 Capture And Conversion, Zhang Xinggang
Student Works (2020-2029)
Carbon capture and utilization (CCU) is increasingly being adopted as a strategy to minimize carbon dioxide (CO₂) emissions. Integrated CO₂ capture and utilization (ICCU) is more attractive as it reduces overall cost and energy consumption by eliminating the need for gas compression and transportation. Advances in ICCU and the development of dual functional materials (DFMs) capable of adsorbing and in situ converting CO₂ have attracted increasing attention in both academia and industry, driven by the need for efficient CO₂ utilization pathways. After a detailed analysis of the literature, zeolites have emerged as prominent materials for use as adsorbents and catalyst …
High Quality Single-Crystalline Aluminum Nitride Grown Using Pulsed Atomic-Layer Epitaxy Technique By Mocvd On Sapphire Substrate, Mohd Nazri Abd Rahman
High Quality Single-Crystalline Aluminum Nitride Grown Using Pulsed Atomic-Layer Epitaxy Technique By Mocvd On Sapphire Substrate, Mohd Nazri Abd Rahman
Student Works (2020-2029)
The unique structural properties and engineering characteristics of nitride-based materials have given them a special position in semiconductor applications. Alloys with a tuned energy bandgap from ultraviolet to infrared wavelengths are possible to be deposited in maintaining the wurtzite crystal structure. However, the aluminum nitride / aluminum gallium nitride (AlN/AlGaN) based hetero-structures for deep-ultraviolet (DUV) emitters as well as AlN-based actuators and piezoelectric sensors are highly inefficient owing to the excessive mismatch in thermal and lattice features between these epilayers with flat c-plane sapphire substrates, resulting in crack formation and high dislocation densities. This thesis mainly focuses on the development …
New Metal Based Saturable Absorber For Ultrashort Pulse Generation, Muhammad Taufiq Ahmad
New Metal Based Saturable Absorber For Ultrashort Pulse Generation, Muhammad Taufiq Ahmad
Student Works (2020-2029)
Cost-efficient, robust and flexible laser systems are vital for a wide-range of applications ranging from high-precision material processing to biomedicine. This thesis aims to explore pure silver and gold based saturable absorbers (SAs) as Q-switcher and mode-locker in various fibre laser cavities. The generations of Q-switched pulses in 1-,1.55-, and 2-micron regions have been successfully demonstrated using a pure gold, which was deposited using electron beam deposition onto a PVA thin-film as SA. For instance, a stable Q-switched thulium-doped fibre laser (TDFL) operating at 1949 nm was successfully demonstrated with the gold SA. The proposed laser generates Q switched pulses …
Optimized Transconductance Designs To Enhance The Linearity Performance Of Rf Front-End Receiver Circuits In 130 Nm Cmos Technology, Nandini Vitee
Optimized Transconductance Designs To Enhance The Linearity Performance Of Rf Front-End Receiver Circuits In 130 Nm Cmos Technology, Nandini Vitee
Student Works (2020-2029)
Highly linear front-end circuits are greatly desired for wireless receivers to improve the dynamic range. However, intermodulation distortions caused by the non-linear transconductor current limits the linearity of the front-end receiver circuit in CMOS technologies. In addition to the inherent nonlinear effect, the downscaling of CMOS further exacerbates the linearity of the circuit due to lower voltage headroom and high-field mobility. Thus, it is essential to develop effective circuit techniques that can aid linearity enhancement without jeopardizing other preferred performances such as low noise, high conversion gain, and low-power consumption. In this thesis, two different high linear transconductors are presented …
Performance Evaluation Of Lightweight Normal And Geopolymer Foamed Concrete Using Palm Oil Fuel Ash As Partial Replacement Of Binder, M .E. Alnahhal Ahmed
Performance Evaluation Of Lightweight Normal And Geopolymer Foamed Concrete Using Palm Oil Fuel Ash As Partial Replacement Of Binder, M .E. Alnahhal Ahmed
Student Works (2020-2029)
Carbon dioxide (CO2) emissions from Ordinary Portland Cement (OPC) have a detrimental effect on the environment and this had led many researchers to search for other alternatives in the form of sustainable cementitious materials. The depletion of natural resources and dumping the industrial by-products and waste materials are serious concern to our environment. This research focusses on the performance of using a palm oil industrial by-product, namely, palm oil fuel ash (POFA), as a partial replacement for OPC and fly ash (FA) in lightweight normal foamed concrete and lightweight geopolymer foamed concrete, respectively. Thus, using 10, 20, and 30% POFA …
Investigation On The Mechanical Properties And Microstructure Analysis Of Micro-Resistance Spot Welding Between Stainless Steel 316l And Tl-6al-4v, Mohd Mansor Muhammad Safwan
Investigation On The Mechanical Properties And Microstructure Analysis Of Micro-Resistance Spot Welding Between Stainless Steel 316l And Tl-6al-4v, Mohd Mansor Muhammad Safwan
Student Works (2020-2029)
In this study, ASS 316L and Ti-6Al-4V were welded together by micro-resistance spot welding (μRSW) at different combinations of welding parameters using specifically design electrode geometry in order to acquire the optimal combination of welding parameters. The welded joint were subjected to tensile shear strength test to determine the influence of welding current, welding time, welding force and different design of elctrode tip on the mechanical properties and the strength of the welded joint. The experiment was conducted by using full factorial design of experiment (DoE) with L27 orthogonal array and utilizing the analysis of variance (ANOVA) to obtain the …
Synthesis And Characterization Of Limpo[4] (M=Mn, Ni And Fe) Olivine Materials., Azlin Sanusi
Synthesis And Characterization Of Limpo[4] (M=Mn, Ni And Fe) Olivine Materials., Azlin Sanusi
Student Works (2010-2019)
Lithium transition metal phosphate, LiMPO4 compounds with olivine structure namely LiMnPO4, LiNiPO4 and LiFePO4 were successfully synthesized in the present work. LiMnPO4 and LiNiPO4 were synthesized by the sol-gel method with tartaric acid as the chelating agent. LiFePO4 was synthesized via the chemical precipitation and low temperature sterilizer heating method. TGA was carried out on LiMnPO4 and LiNiPO4 samples to determine the firing temperature of the gel precursor and the thermal stability of the prepared samples. LiMnPO4 was heated for 15 hours at various temperatures and LiNiPO4 was formed at 1000 oC with firing time of 24 hours. Firing of …
Characterization Of Lithium Intercalation Oxides Based On Manganese And Copper, Vengidason Seguprakash
Characterization Of Lithium Intercalation Oxides Based On Manganese And Copper, Vengidason Seguprakash
Student Works (2000-2009)
In this study, several lithium intercalation compounds have been synthesized and characterized. Lithium manganese copper oxide cathode materials were prepared by sol gel method using tartaric acid as the gelating agent. Five types of cathode materials were synthesized. The sol gel technique has permitted the synthesis of manganese oxides that are capable of reversibly intercalating large amounts of lithium ions. To see the effect of adding copper to lithium manganese oxide several experiments were carried out. These include X-Ray diffraction to see whether the LiMn₂O₄ lattice has widened or collapsed. It was seen that LiMn₂O₄ and LiCu₂O₂ XRD patterns were …