STUDY OF NOVEL LOW DIMENSIONAL MATERIALS SYNTHESIZED THROUGH CHEMICAL VAPOR DEPOSITION

Abstract

Novel low dimensional materials have been studied, including synthesis study and application study. Chemical Vapor Deposition, a versatile methodology, has been employed as the main synthesis methodology. Specifically, three groups of materials are the subjects of this comprehensive study. They are: the group of MoS2/MoO2 nanoflowers and nanoflakes, the group of WOx nanowires/nanoneedles, and the group of CuS nanoflakes. MoS2 and MoO2 were tested for their catalytic ability for hydrogen evolution reaction. It was found that MoO2 samples displayed the overall strongest catalytic ability, followed by a hybrid structure and then by MoS2. For WOx nanostructures, they were tested for their heat reflecting property and field emission property. It was found that samples deposited with W17O47 nanoneedles can function as good thermal shielding material due their ability to absorb and reflect NIR wavelength while permitting passage of the visible spectrum. Additionally, due to the metallic nature of W17O47, they can also function as viable field emitters. Lastly, CuS nanoflakes were tested for their ability as dye degradation catalysts. The results reveal that the nanoflakes can effectively decompose methylene blue dye under UV light illumination, resulting in around 55% reduction in characteristic absorption after 2 hours.