Theoretical and Experimental Insight into the Mechanism for Spontaneous Vertical Growth of ReS2 Nanosheets

Debjit Ghoshal, Anthony Yoshimura, Tushar Gupta, Andrew House, Swastik Basu, Yanwen Chen, Tianmeng Wang, Yang Yang, Wenjia Shou, Jordan A. Hachtel, Juan Carlos Idrobo, Toh Ming Lu, Sagnik Basuray, Vincent Meunier, Su Fei Shi, Nikhil Koratkar

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Rhenium disulfide (ReS2) differs fundamentally from other group-VI transition metal dichalcogenides (TMDs) due to its low structural symmetry, which results in its optical and electrical anisotropy. Although vertical growth is observed in some TMDs under special growth conditions, vertical growth in ReS2 is very different in that it is highly spontaneous and substrate-independent. In this study, the mechanism that underpins the thermodynamically favorable vertical growth mode of ReS2 is uncovered. It is found that the governing mechanism for ReS2 growth involves two distinct stages. In the first stage, ReS2 grows parallel to the growth substrate, consistent with conventional TMD growth. However, subsequent vertical growth is nucleated at points on the lattice where Re atoms are “pinched” together. At such sites, an additional Re atom binds with the cluster of pinched Re atoms, leaving an under-coordinated S atom protruding out of the ReS2 plane. This under-coordinated S is “reactive” and binds to free Re and S atoms, initiating growth in a direction perpendicular to the ReS2 surface. The utility of such vertical ReS2 arrays in applications where high surface-to-volume ratio and electric-field enhancement are essential, such as surface enhanced Raman spectroscopy, field emission, and solar-based disinfection of bacteria, is demonstrated.

Original languageEnglish (US)
Article number1801286
JournalAdvanced Functional Materials
Volume28
Issue number30
DOIs
StatePublished - Jul 25 2018

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Keywords

  • ReS nanosheets
  • field emission
  • photocatalysis
  • solar water disinfection
  • vertical growth mechanism

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