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.