Scalable preparation of water-soluble ink of few-layered WSe_2 nanosheets for large-area electronics |
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| Authors: | Guoyu Xian Jianshuo Zhang Li Liu Jun Zhou Hongtao Liu Lihong Bao Chengmin Shen Yongfeng Li Zhihui Qin Haitao Yang |
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| Affiliation: | (Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education&Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices,School of Physics and Electronics,Hunan University,Changsha 410082,China;Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing 102249,China) |
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| Abstract: | Few-layer two-dimensional(2 D) semiconductor nanosheets with a layer-dependent band gap are attractive building blocks for large-area thin-film electronics. A general approach is developed to fast prepare uniform and phase-pure 2 HWSe2 semiconducting nanosheets at a large scale, which involves the supercritical carbon dioxide(SC-CO2) treatment and a mild sonication-assisted exfoliation process in aqueous solution. The as-prepared 2 H-WSe2 nanosheets preserve the intrinsic physical properties and intact crystal structures, as confirmed by Raman, x-ray photoelectron spectroscopy(XPS),and scanning transmission electron microscope(STEM). The uniform 2 H-WSe2 nanosheets can disperse well in water for over six months. Such good dispersivity and uniformity enable these nanosheets to self-assembly into thickness-controlled thin films for scalable fabrication of large-area arrays of thin-film electronics. The electronic transport and photoelectronic properties of the field-effect transistor based on the self-assembly 2 H-WSe2 thin film have also been explored. |
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