Shane A. Catledge
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View article: Microwave-Induced Hydrogen Plasma as a New Synthesis Process for High-Entropy Carbides
Microwave-Induced Hydrogen Plasma as a New Synthesis Process for High-Entropy Carbides Open
Microwave-Induced Hydrogen Plasma (MIHP) is introduced as a novel synthesis route for producing high-entropy carbides (HECs), offering an alternative to conventional mechanical alloying and/or sintering techniques. In this study, a represe…
View article: Experimental and computational studies on high-entropy carbide MoNbTaVWC5 under high pressures
Experimental and computational studies on high-entropy carbide MoNbTaVWC5 under high pressures Open
High-entropy carbide, MoNbTaVWC5, was synthesized from oxide precursors of the constituent metals, mixed with graphite powder in a microwave-generated hydrogen plasma at 26.66 kPa and 2100 °C. Ambient x-ray diffraction analysis confirms th…
View article: Microwave-Induced Hydrogen Plasma as a New Synthesis Process for High-Entropy Carbides
Microwave-Induced Hydrogen Plasma as a New Synthesis Process for High-Entropy Carbides Open
Microwave-Induced Hydrogen Plasma (MIHP) is introduced as a novel synthesis route for producing high-entropy carbides (HECs), offering an alternative to conventional mechanical alloying and/or sintering techniques. In this study, a represe…
View article: Novel superhard BC10N synthesized by microwave plasma CVD
Novel superhard BC10N synthesized by microwave plasma CVD Open
Microwave Plasma Chemical Vapor Deposition (MPCVD) was used to synthesize novel superhard BC10N on silicon substrates. Feedgas mixtures of H2, CH4, N2, and B2H6 were used for a range of systematically varied microwave power, chamber pressu…
View article: High entropy alloy MoNbTaVW synthesized by metal-oxide reduction in a microwave plasma
High entropy alloy MoNbTaVW synthesized by metal-oxide reduction in a microwave plasma Open
A unique approach was used to synthesize the high entropy alloy MoNbTaVW via reduction of metal-oxide precursors in a microwave plasma. The metal-oxides underwent ball milling and consolidation before plasma annealing at 1800 °C for 1 h wi…
View article: High Entropy Borides Synthesized by the Thermal Reduction of Metal Oxides in a Microwave Plasma
High Entropy Borides Synthesized by the Thermal Reduction of Metal Oxides in a Microwave Plasma Open
Metal oxide thermal reduction, enabled by microwave-induced plasma, was used to synthesize high entropy borides (HEBs). This approach capitalized on the ability of a microwave (MW) plasma source to efficiently transfer thermal energy to dr…
View article: Effect of argon flow rate and direct current bias on the growth of boron nitride coating in low-temperature plasma
Effect of argon flow rate and direct current bias on the growth of boron nitride coating in low-temperature plasma Open
A microwave plasma chemical vapor deposition system was used to synthesize cubic boron nitride (cBN) coatings on diamond seeded silicon substrates using direct current (DC) bias. Effects of the argon (Ar) flow rate and bias voltage on the …
View article: Properties of high entropy borides synthesized via microwave-induced plasma
Properties of high entropy borides synthesized via microwave-induced plasma Open
Microwave-induced plasma was used to anneal precursor powders containing five metal oxides with carbon and boron carbide as reducing agents, resulting in high entropy boride ceramics. Measurements of hardness, phase structure, and oxidatio…
View article: Bias-Enhanced Formation of Metastable and Multiphase Boron Nitride Coating in Microwave Plasma Chemical Vapor Deposition
Bias-Enhanced Formation of Metastable and Multiphase Boron Nitride Coating in Microwave Plasma Chemical Vapor Deposition Open
Boron nitride (BN) is primarily a synthetically produced advanced ceramic material. It is isoelectronic to carbon and, like carbon, can exist as several polymorphic modifications. Microwave plasma chemical vapor deposition (MPCVD) of metas…
View article: Single-Step Synthesis Process for High-Entropy Transition Metal Boride Powders Using Microwave Plasma
Single-Step Synthesis Process for High-Entropy Transition Metal Boride Powders Using Microwave Plasma Open
A novel approach is demonstrated for the synthesis of the high entropy transition metal boride (Ta, Mo, Hf, Zr, Ti)B2 using a single heating step enabled by microwave-induced plasma. The argon-rich plasma allows rapid boro-carbothermal red…
View article: Effects of direct current bias on nucleation density of superhard boron-rich boron carbide films made by microwave plasma chemical vapor deposition
Effects of direct current bias on nucleation density of superhard boron-rich boron carbide films made by microwave plasma chemical vapor deposition Open
We report bias enhanced nucleation and growth of boron-rich deposits through systematic study of the effect of a negative direct current substrate bias during microwave plasma chemical vapor deposition. The current flowing through a silico…
View article: Selective Deposition of Hard Boron-Carbon Microstructures on Silicon
Selective Deposition of Hard Boron-Carbon Microstructures on Silicon Open
Boron-rich B-C compounds with high hardness have been recently synthesized by the chemical vapor deposition (CVD) method. In this paper, we present our successful efforts in the selective growth of microstructures of boron-carbon compounds…
View article: High-pressure high-temperature synthesis and thermal equation of state of high-entropy transition metal boride
High-pressure high-temperature synthesis and thermal equation of state of high-entropy transition metal boride Open
A high-entropy transition metal boride (Hf0.2 Ti0.2 Zr0.2 Ta0.2 Mo0.2)B2 sample was synthesized under high-pressure and high-temperature starting from ball-milled oxide precursors (HfO2, TiO2, ZrO2, Ta2O5, and MoO3) mixed with graphite and…
View article: Superhard Boron-Rich Boron Carbide with Controlled Degree of Crystallinity
Superhard Boron-Rich Boron Carbide with Controlled Degree of Crystallinity Open
Superhard boron-rich boron carbide coatings were deposited on silicon substrates by microwave plasma chemical vapor deposition (MPCVD) under controlled conditions, which led to either a disordered or crystalline structure, as measured by X…
View article: First-Principles Predictions and Synthesis of B50C2 by Chemical Vapor Deposition
First-Principles Predictions and Synthesis of B50C2 by Chemical Vapor Deposition Open
Density functional theory predictions have been combined with the microwave-plasma chemical vapor deposition technique to explore metastable synthesis of boron-rich boron-carbide materials. A thin film synthesis of high-hardness (up to 37 …
View article: Non-equilibrium organosilane plasma polymerization for modulating the surface of PTFE towards potential blood contact applications
Non-equilibrium organosilane plasma polymerization for modulating the surface of PTFE towards potential blood contact applications Open
We report a novel and facile organosilane plasma polymerization method designed to improve the surface characteristics of poly(tetrafluoroethylene) (PTFE).
View article: Hexagonal boron nitride grown using high atomic boron emission during microwave plasma chemical vapor deposition
Hexagonal boron nitride grown using high atomic boron emission during microwave plasma chemical vapor deposition Open
Boron nitride (BN) is a member of Group III nitrides and continues to spark interest among the scientific community for its mechanical properties, chemical inertness, thermal conductivity, and electrical insulating properties. In this stud…
View article: Molecularly Imprinted Polyacrylamide with Fluorescent Nanodiamond for Creatinine Detection
Molecularly Imprinted Polyacrylamide with Fluorescent Nanodiamond for Creatinine Detection Open
Creatinine measurement in blood and urine is an important diagnostic test for assessing kidney health. In this study, a molecularly imprinted polymer was obtained by incorporating fluorescent nanodiamond into a creatinine-imprinted polyacr…
View article: Computational Predictions and Microwave Plasma Synthesis of Superhard Boron-Carbon Materials
Computational Predictions and Microwave Plasma Synthesis of Superhard Boron-Carbon Materials Open
Superhard boron-carbon materials are of prime interest due to their non-oxidizing properties at high temperatures compared to diamond-based materials and their non-reactivity with ferrous metals under extreme conditions. In this work, evol…