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- Title
Chemical vapor deposition growth of monolayer MoSe nanosheets.
- Authors
Shaw, Jonathan; Zhou, Hailong; Chen, Yu; Weiss, Nathan; Liu, Yuan; Huang, Yu; Duan, Xiangfeng
- Abstract
The synthesis of two-dimensional (2D) layered materials with controllable thickness is of considerable interest for diverse applications. Here we report the first chemical vapor deposition growth of single- and few-layer MoSe nanosheets. By using Se and MoO as the chemical vapor supply, we demonstrate that highly crystalline MoSe can be directly grown on the 300 nm SiO/Si substrates to form optically distinguishable single- and multi-layer nanosheets, typically in triangular shaped domains with edge lengths around 30 μm, which can merge into continuous thin films upon further growth. Micro-Raman spectroscopy and imaging was used to probe the thickness-dependent vibrational properties. Photoluminescence spectroscopy demonstrates that MoSe monolayers exhibit strong near band edge emission at 1.55 eV, while bilayers or multi-layers exhibit much weaker emission, indicating of the transition to a direct band gap semiconductor as the thickness is reduced to a monolayer. [Figure not available: see fulltext.]
- Publication
Nano Research, 2014, Vol 7, Issue 4, p1
- ISSN
1998-0124
- Publication type
Article
- DOI
10.1007/s12274-014-0417-z