INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Preparing Large Area MoS2 Thin Layers by Improved Chemical Vapor Deposition Under Instruction of Thermodynamic Calculations |
GONG Yueqiu, SHI Xiaoyu, LI Jingbing, XIE Shuhong
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School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105 |
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Abstract For the sake of determining the optimal temperature for preparing MoS2thin layers by improved chemical vapor deposition (CVD), we calculated and analyzed the Gibbs free energy of the reaction system at various temperatures. Under the instruction of thermodynamic calculations, we prepared the MoS2 nanosheets in a multi-temperature zone tube furnace, with the precise control of reaction temperature and deposition temperature, and explored the impact of several important reference temperatures on the growth of MoS2. It could be found from the results that the MoS2 thin layers prepared by improved CVD were endowed with high quality and uniform thickness, and temperature exerted phenomenal impact on the morphology, size and crystalline quality of these MoS2samples. Especially, the increase of temperature gave rise to the enlargement of the MoS2 area, yet MoS2nanosheets grew into polygons when the temperature reached 850 ℃. Accordingly, 800 ℃ was determined as the optimal preparation temperature. Meanwhile, Raman spectrum, fluorescence spectrum, scanning electron microscopy and atomic force microscopy were employed to confirm the quality and sizes of MoS2, and analytic results proved that several hundred square micron large area MoS2 thin films with high crystalline quality and uniform thickness could be obtained at preparation temperature of 800 ℃.
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Published: 16 September 2019
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Fund:This work was financially supported by the National Natural Science Foundation of China (11772286). |
About author:: Yueqiu Gongreceived his Ph.D. degree in 2006 from Wuhan University of Technology. He is currently an associate professor. He worked at Xiangtan University in June 2006. His research interests are preparation of ferroelectric films, two-dimensional materials and devices. |
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