Redox Photochemistry on Van Der Waals Surfaces for Reversible Doping in 2D Materials

Lingli Huang, Tiefeng Yang, Lok Wing Wong, Fangyuan Zheng, Xin Chen, Ka Hei Lai, Haijun Liu, Quoc Huy Thi, Dong Shen, Chun Sing Lee, Qingming Deng, Jiong Zhao, Thuc Hue Ly

Research output: Journal article publicationJournal articleAcademic researchpeer-review

12 Citations (Scopus)


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.

Original languageEnglish
Article number2009166
JournalAdvanced Functional Materials
Issue number16
Publication statusPublished - 15 Apr 2021


  • 2D materials
  • anisotropic
  • photochemistry
  • redox
  • reversible doping

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


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