Volume 32 Issue 1 - January 3, 2020 PDF
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Synthesis of 2D Materials and Related Application
Department of Materials Science and Engineering, National Cheng Kung University
 
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Since 2004, graphene was successfully prepared by mechanical exfoliation, people paid intensive attention to 2-dimensional materials. Among a class of 2D materials family, transitional metal dichalcogenides in 2-dimensional was a potential alternative to graphene due to the transition of band structure from indirect to direct. In addition, the atomic arrangement of the transition metal and chalcogen element will be classified into 1T phase of metal properties and 2H phases of semiconductor properties, and importantly the 1T / 2H ratio will be adjusted, benefitting the subsequent applications. Because of the critical role it plays in boosting the performance of devices, scientists have proposed a number of approaches for phases engineering. Our research utilized the oblique-angle evaporation to fabricate two-dimensional materials with nano-structures with controlling the 1T / 2H ratio by tuning plasma power, improve the sensitivity to detect nitric oxide, and even operating it under atmospheric environment.
Figure 2. Response as a function of NO concentration.
Figure 1. Time-resolved response upon NO gas with varied concentration.
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