期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 53, 期 20, 页码 5083-5087出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201311309
关键词
chalcogenides; copper selenide; nanomaterials; phase transformation; template synthesis
资金
- MOE under AcRF in Singapore [ARC 26/13, MOE2013-T2-1-034, RG 61/12, RGT18/13, RG5/13, M4080865.070.706022]
- National Research Foundation, Prime Minister's Office, Singapore
Semiconducting nanosheets with microscale lateral size are attractive building blocks for the fabrication of electronic and optoelectronic devices. The phase-controlled chemical synthesis of semiconducting nanosheets is of particular interest, because their intriguing properties are not only related to their size and shape, but also phase-dependent. Herein, a facile method for the synthesis of phase-pure, microsized, two-dimensional (2D) CuSe nanosheets with an average thickness of approximately 5nm is demonstrated. These hexagonal-phased CuSe nanosheets were transformed into cubic-phased Cu2-xSe nanosheets with the same morphology simply by treatment with heat in the presence of Cu-I cations. The phase transformation, proposed to be a template-assisted process, can be extended to other systems, such as CuS and Cu1.97S nanoplates. Our study offers a new method for the phase-controlled preparation of 2D nanomaterials, which are not readily accessible by conventional wet-chemical methods.
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