title: Atom-Thin SnS2-xSex with Adjustable Compositions by Direct Liquid Exfoliation from Single Crystals.
abstract: 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 SnS2-xSex (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.
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Zhanhai
authors.initials: Z
authors.lastname: Yang
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Liang
authors.affiliation: Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China.
authors.forename: Xusheng
authors.initials: X
authors.lastname: Wang
authors.affiliation: Research Center for Bioengineering and Sensing Technology, University of Science & Technology Beijing , Beijing 100083, China.
authors.forename: Xinlei
authors.initials: X
authors.lastname: Ma
authors.affiliation: Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Zhang
authors.affiliation: National Center for Nanoscience and Technology , Beijing 100190, China.
authors.forename: Yanlian
authors.initials: Y
authors.lastname: Yang
authors.affiliation: National Center for Nanoscience and Technology , Beijing 100190, China.
authors.forename: Liming
authors.initials: L
authors.lastname: Xie
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Chen
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Yujia
authors.initials: Y
authors.lastname: Long
authors.affiliation: Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China.
authors.forename: Jitao
authors.initials: J
authors.lastname: Chen
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Yunjie
authors.initials: Y
authors.lastname: Chang
authors.affiliation: Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China.
authors.forename: Chunhua
authors.initials: C
authors.lastname: Yan
authors.affiliation: Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China.
authors.forename: Xinxiang
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Research Center for Bioengineering and Sensing Technology, University of Science & Technology Beijing , Beijing 100083, China.
authors.forename: Xueji
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Binghui
authors.initials: B
authors.lastname: Ge
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Zhian
authors.initials: Z
authors.lastname: Ren
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Mianqi
authors.initials: M
authors.lastname: Xue
authors.affiliation: Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Genfu
authors.initials: G
authors.lastname: Chen
keywords: atom-thin chalcogenides; high-performance sensor; in situ pyrolysis; liquid exfoliation; tunable activation energy