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Thermal Oxidation of WSe2 Nanosheets Adhered on SiO2/Si Substrates

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Title
Thermal Oxidation of WSe2 Nanosheets Adhered on SiO2/Si Substrates
Author(s)
Yingnan Liu; Cheng Tan; Harry Chou; Avinash Nayak; Di Wu; Rudresh Ghosh; Hsiao-Yu Chang; Yufeng Hao; Xiaohan Wang; Joon-Seok Kim; Richard Piner; Rodney S. Ruoff; Deji Akinwande; Keji Lai
Publication Date
2015-08
Journal
NANO LETTERS, v.15, no.8, pp.4979 - 4984
Publisher
AMER CHEMICAL SOC
Abstract
Because of the drastically different intralayer versus interlayer bonding strengths, the mechanical, thermal, and electrical properties of two-dimensional (2D) materials are highly anisotropic between the in-plane and out-of-plane directions. The structural anisotropy may also play a role in chemical reactions, such as oxidation, reduction, and etching. Here, the composition, structure, and electrical properties of mechanically exfoliated WSe2 nanosheets on SiO2/Si substrates were studied as a function of the extent of thermal oxidation. A major component of the oxidation, as indicated from optical and Raman data, starts from the nanosheet edges and propagates laterally toward the center. Partial oxidation also occurs in certain areas at the surface of the flakes, which are shown to be highly conductive by microwave impedance microscopy. Using secondary ion mass spectroscopy, we also observed extensive oxidation at the WSe2-SiO2 interface. The combination of multiple microcopy methods can thus provide vital information on the spatial evolution of chemical reactions on 2D materials and the nanoscale electrical properties of the reaction products. © 2015 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/1934
ISSN
1530-6984
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > Journal Papers (저널논문)
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