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양자나노과학 연구단
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Selective Chemical Response of Transition Metal Dichalcogenides and Metal Dichalcogenides in Ambient Conditions

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Title
Selective Chemical Response of Transition Metal Dichalcogenides and Metal Dichalcogenides in Ambient Conditions
Author(s)
Jun Hong Park; Suresh Vishwanath; Steven Wolf; Kehao Zhang; Iljo Kwak; Mary Edmonds; Michael Breeden; Xinyu Liu; Margaret Dobrowolska; Jacek Furdyna; Joschua A. Robinson; Huili Grace Xing; Andrew C. Kummel
Publication Date
2017-08
Journal
ACS Applied Materials & Interfaces, v.9, no.34, pp.29255 - 29264
Publisher
AMER CHEMICAL SOC
Abstract
To fabricate practical devices based on semiconducting two-dimensional (2D) materials, the source, channel, and drain materials are exposed to ambient air. However, the response of layered 2D materials to air has not been fully elucidated at the molecular level. In the present report, the effects of air exposure on transition metal dichalcogenides (TMD) and metal dichalcogenides (MD) are studied using ultrahigh-vacuum scanning tunneling microscopy (STM). The effects of a 1-day ambient air exposure on MBE-grown WSe2, chemical vapor deposition (CVD)-grown MoS2, and MBE SnSe2 are compared. Both MBE-grown WSe2 and CVD-grown MoS2 display a selective air exposure response at the step edges, consistent with oxidation on WSe2 and adsorption of hydrocarbon on MoS2, while the terraces and domain/grain boundaries of both TMDs are nearly inert to ambient air. Conversely, MBE-grown SnSe2, an MD, is not stable in ambient air. After exposure in ambient air for 1 day, the entire surface of SnSe2 is decomposed to SnOx and SeOx, as seen with X-ray photoelectron spectroscopy. Since the oxidation enthalpy of all three materials is similar, the data is consistent with greater oxidation of SnSe2 being driven by the weak bonding of SnSe2. © 2017 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/4113
ISSN
1944-8244
Appears in Collections:
Center for Quantum Nanoscience(양자나노과학 연구단) > Journal Papers (저널 논문)
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