10.1021/acs.jpcc.8b00679.s001
Jie Li
Jie
Li
Shuai Cheng
Shuai
Cheng
Zhixuan Liu
Zhixuan
Liu
Wenfeng Zhang
Wenfeng
Zhang
Haixin Chang
Haixin
Chang
Centimeter-Scale, Large-Area, Few-Layer 1T′-WTe<sub>2</sub> Films by Chemical Vapor Deposition and Its Long-Term Stability
in Ambient Condition
American Chemical Society
2018
WTe 2
Chemical Vapor Deposition
uniform
ambient condition
stability
30 days
Surface-oxidization-induced magnetoresistance enhancement
transmission electron microscopy
few-layer WTe 2
thickness-dependent Raman spectra
CVD
chemical vapor deposition
exposure
Ambient Condition WTe 2
2018-03-07 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Centimeter-Scale_Large-Area_Few-Layer_1T_-WTe_sub_2_sub_Films_by_Chemical_Vapor_Deposition_and_Its_Long-Term_Stability_in_Ambient_Condition/5999537
WTe<sub>2</sub> shows
unique properties different from sulfides
and selenides. Large-area, uniform few-layer 1T′ phase WTe<sub>2</sub> and long-term stability are essential for fundamental studies
and applications of WTe<sub>2</sub>. Here, centimeter-scale, large-area,
uniform few-layer 1T′-WTe<sub>2</sub> films are prepared by
a facile, low-temperature, chemical vapor deposition (CVD) method
and the long-term stability of such CVD-grown 1T′-WTe<sub>2</sub> up to 30 days in ambient condition is studied for the first time.
Raman spectroscopy and transmission electron microscopy reveal the
high quality of WTe<sub>2</sub>. The thickness of few-layer WTe<sub>2</sub> can be well tuned, and thickness-dependent Raman spectra
are observed. The electrical and quantum electronic transport properties
are found to be highly influenced by air exposure with different exposure
times under ambient condition. The conductivity decreases by about
10 times with exposure, whereas weak antilocation behavior is observed
in both pristine and air-exposed samples for 30 days. Surface-oxidization-induced
magnetoresistance enhancement up to 30% is discovered unexpectedly.