作者
Ana Laura Elías, Néstor Perea-López, Andrés Castro-Beltrán, Ayse Berkdemir, Ruitao Lv, Simin Feng, Aaron D Long, Takuya Hayashi, Yoong Ahm Kim, Morinobu Endo, Humberto R Gutiérrez, Nihar R Pradhan, Luis Balicas, Thomas E Mallouk, Florentino López-Urías, Humberto Terrones, Mauricio Terrones
发表日期
2013/6/25
期刊
ACS nano
卷号
7
期号
6
页码范围
5235-5242
出版商
American Chemical Society
简介
The isolation of few-layered transition metal dichalcogenides has mainly been performed by mechanical and chemical exfoliation with very low yields. In this account, a controlled thermal reduction–sulfurization method is used to synthesize large-area (∼1 cm2) WS2 sheets with thicknesses ranging from monolayers to a few layers. During synthesis, WOx thin films are first deposited on Si/SiO2 substrates, which are then sulfurized (under vacuum) at high temperatures (750–950 °C). An efficient route to transfer the synthesized WS2 films onto different substrates such as quartz and transmission electron microscopy (TEM) grids has been satisfactorily developed using concentrated HF. Samples with different thicknesses have been analyzed by Raman spectroscopy and TEM, and their photoluminescence properties have been evaluated. We demonstrated the presence of single-, bi-, and few-layered WS2 on as-grown …
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