期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 16, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202009166
关键词
anisotropic; photochemistry; redox; reversible doping; 2D materials
类别
资金
- National Science Foundation of China [51872248, 21703076, 51922113]
- Hong Kong Research Grant Council under Early Career Scheme [25301018]
- Hong Kong Research Grant Council General Research Fund [11300820, 15302419]
- City University of Hong Kong [9680241, 7005259]
- Natural Science Foundation of Jiangsu Province of China [BK20170466]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [18KJA140001]
Research has shown that reversible oxidation-reduction reactions can be introduced on van der Waals surfaces through simple photochemistry, enabling doping effects on 2D semiconductors, with evidence of covalently functionalized oxygen groups being grafted and removed. This approach allows for reversible tuning of optical and electrical properties over a wide range.
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 ReX2 (X = S or Se) facilitated by simple photochemistry. Ultraviolet (UV) light (with humid) and laser exposure can reversibly oxidize and reduce rhenium disulfide (ReS2) and rhenium diselenide (ReSe2), 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.
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