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Redox Photochemistry on Van Der Waals Surfaces for Reversible Doping in 2D Materials
Author(s) -
Huang Lingli,
Yang Tiefeng,
Wong Lok Wing,
Zheng Fangyuan,
Chen Xin,
Lai Ka Hei,
Liu Haijun,
Thi Quoc Huy,
Shen Dong,
Lee ChunSing,
Deng Qingming,
Zhao Jiong,
Ly Thuc Hue
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202009166
Subject(s) - materials science , van der waals force , raman spectroscopy , photochemistry , doping , rhenium , redox , x ray photoelectron spectroscopy , chemical engineering , optoelectronics , chemistry , molecule , optics , organic chemistry , physics , metallurgy , engineering
Abstract Despite the van der Waals (vdW) surfaces are usually chemically inert, un‐destructive, scalable, and reversible redox reactions are introduced on the vdW surfaces of 2D anisotropic semiconductors ReX 2 (X = S or Se) facilitated by simple photochemistry. Ultraviolet (UV) light (with humid) and laser exposure can reversibly oxidize and reduce rhenium disulfide (ReS 2 ) and rhenium diselenide (ReSe 2 ), respectively, yielding a pronounced doping effect with good control. Evidenced by Raman spectroscopy, dynamic force microscopy, transmission electron microscopy, and X‐ray photoelectron spectroscopy, the grafting and removal of covalently functionalized oxygen groups on the perfect vdW surfaces are confirmed. The optical and electrical properties can be thereby reversibly tunable in wide ranges. Such optical direct‐writing and rewritable capability via solvent/contaminant‐free approach for chemical doping are compelling in the coming era of 2D materials.