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A Facile and Universal Top‐Down Method for Preparation of Monodisperse Transition‐Metal Dichalcogenide Nanodots
Author(s) -
Zhang Xiao,
Lai Zhuangchai,
Liu Zhengdong,
Tan Chaoliang,
Huang Ying,
Li Bing,
Zhao Meiting,
Xie Linghai,
Huang Wei,
Zhang Hua
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201501071
Subject(s) - nanodot , dispersity , materials science , nanotechnology , transition metal , sonication , polyvinylpyrrolidone , chemical engineering , catalysis , chemistry , organic chemistry , polymer chemistry , engineering
Despite unique properties of layered transition‐metal dichalcogenide (TMD) nanosheets, there is still lack of a facile and general strategy for the preparation of TMD nanodots (NDs). Reported herein is the preparation of a series of TMD NDs, including TMD quantum dots (e.g. MoS 2 , WS 2 , ReS 2 , TaS 2 , MoSe 2 and WSe 2 ) and NbSe 2 NDs, from their bulk crystals by using a combination of grinding and sonication techniques. These NDs could be easily separated from the N ‐methyl‐2‐pyrrolidone when post‐treated with n‐hexane and then chloroform. All the TMD NDs with sizes of less than 10 nm show a narrow size distribution with high dispersity in solution. As a proof‐of‐concept application, memory devices using TMD NDs, for example, MoSe 2 , WS 2 , or NbSe 2 , mixed with polyvinylpyrrolidone as active layers, have been fabricated, which exhibit a nonvolatile write‐once‐read‐many behavior. These high‐quality TMD NDs should have various applications in optoelectronics, solar cells, catalysis, and biomedicine.

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