Atom-Thin SnS2–xSex with Adjustable Compositions by Direct Liquid Exfoliation from Single Crystals

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• 作者：Zhanhai Yang ; Hui Liang ; Xusheng Wang ; Xinlei Ma ; Tao Zhang ; Yanlian Yang ; Liming Xie ; Dong Chen ; Yujia Long ; Jitao Chen ; Yunjie Chang ; Chunhua Yan ; Xinxiang Zhang ; Xueji Zhang ; Binghui Ge ; Zhian Ren ; Mianqi Xue ; Genfu Chen
• 刊名：ACS Nano
• 出版年：2016
• 出版时间：January 26, 2016
• 年：2016
• 卷：10
• 期：1
• 页码：755-762
• 全文大小：547K
• ISSN：1936-086X

文摘

Two-dimensional (2D) chalcogenide materials are fundamentally and technologically fascinating for their suitable band gap energy and carrier type relevant to their adjustable composition, structure, and dimensionality. Here, we demonstrate the exfoliation of single-crystal SnS_2–xSe_x (SSS) with S/Se vacancies into an atom-thin layer by simple sonication in ethanol without additive. The introduction of vacancies at the S/Se site, the conflicting atomic radius of sulfur in selenium layers, and easy incorporation with an ethanol molecule lead to high ion accessibility; therefore, atom-thin SSS flakes can be effectively prepared by exfoliating the single crystal via sonication. The in situ pyrolysis of such materials can further adjust their compositions, representing tunable activation energy, band gap, and also tunable response to analytes of such materials. As the most basic and crucial step of the 2D material field, the successful synthesis of an uncontaminated and atom-thin sample will further push ahead the large-scale applications of 2D materials, including, but not limited to, electronics, sensing, catalysis, and energy storage fields.