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Stabilizing metastable polymorphs of transition metal dichalcogenides using thermal decomposition
Nguyen, Vivian
Nguyen, Vivian
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Nguyen_2024.pdf
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2024-04-26
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Nguyen, V. 2024. Stabilizing metastable polymorphs of transition metal dichalcogenides using thermal decomposition. -- In Proceedings: 20th Annual Symposium on Graduate Research and Scholarly Projects. Wichita, KS: Wichita State University
Abstract
Two-dimensional (2D) transition metal dichalcogenides (TMDCs) have been gaining attention due to their photocatalytic, optoelectronic, magnetic applications, and potential for energy storage. These layered materials can form in different polymorphs using TaS$_2$ as example, which exists in 1T, 2H, 3R, 6R, phases etc. Commonly, TMDCs are made in thin films using chemical vapor deposition (CVD), molecular-beam epitaxy (MBE), electrochemical deposition, etc. or in bulk crystals by high temperature solid state reactions. The thin film methods will usually make the most thermodynamically stable polymorph, per TMDC. Different polymorphs will have different properties, however, the conventional methods would not produce metastable, or less stable, polymorphs. Studying the chemistry of metastable TMDCs is crucial for broader applications. In this work, we demonstrate simple methods to form thermodynamically stable and metastable phases of TaS$_2$ and NbS$_2$. Our method uses ternary compounds to decompose into their respective TMDC which produces metastable as well as thermodynamically stable polymorphs. The phase transition between different polymorphs were studied.
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Presented to the 20th Annual Symposium on Graduate Research and Scholarly Projects (GRASP) held at the Rhatigan Student Center, Wichita State University, April 26, 2024.
Research completed in the Department of Chemistry, Fairmount College of Liberal Arts & Sciences.
Research completed in the Department of Chemistry, Fairmount College of Liberal Arts & Sciences.
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Wichita State University
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GRASP
v. 20
v. 20