Scalable preparation of water-soluble ink of few-layered WSe2 nanosheets for large-area electronics

doi:10.1088/1674-1056/ab889e

Abstract Few-layer two-dimensional (2D) 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 2H-WSe₂ 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 2H-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 2H-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 2H-WSe₂ thin film have also been explored.

Keywords: low dimensional nanosheets self-assembly electronics

Received: 27 March 2020
Revised: 02 April 2020
Accepted manuscript online:

PACS:	68.65.-k	(Low-dimensional, mesoscopic, nanoscale and other related systems: structure and nonelectronic properties)
	62.23.Kn	(Nanosheets)
	81.16.Dn	(Self-assembly)
	77.55.df	(For silicon electronics)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51771224, 51772087, and 51471185), the National Key R&D Program of China (Grant Nos. 2016YFJC020013 and 2018FYA0305800), and Fujian Institute of Innovation, Chinese Academy of Sciences.

Corresponding Authors: Haitao Yang, Zhihui Qin
E-mail: htyang@iphy.ac.cn;zhqin@hnu.edu.cn

Cite this article:

Guoyu Xian(冼国裕), Jianshuo Zhang(张建烁), Li Liu(刘丽), Jun Zhou(周俊), Hongtao Liu(刘洪涛), Lihong Bao(鲍丽宏), Chengmin Shen(申承民), Yongfeng Li(李永峰), Zhihui Qin(秦志辉), Haitao Yang(杨海涛) Scalable preparation of water-soluble ink of few-layered WSe₂ nanosheets for large-area electronics 2020 Chin. Phys. B 29 066802

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Scalable preparation of water-soluble ink of few-layered WSe2 nanosheets for large-area electronics

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Scalable preparation of water-soluble ink of few-layered WSe₂ nanosheets for large-area electronics