QUANTIZED COLLOIDS PRODUCED BY DISSOLUTION OF LAYERED SEMICONDUCTORS IN ACETONITRILE.

M. W. Peterson, M. T. Nenadovic, T. Rajh, R. Herak, O. I. Micic, J. P. Goral, A. J. Nozik

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

Small colloidal particles (10-35 Angstrom) of crystalline MoS//2 and WS//2 exhibiting size quantization effects in their optical absorption spectra are believed to form by simple dissolution of crystalline powder in acetonitrile. This conclusion is supported by electron microscopy, electron diffraction, X-ray diffraction, EDAX, and chemical analyses. We speculate that the MoS//2 and WS//2 clusters are formed by cleavage of the van der Waals layers by penetrating solvent molecules, a process related to the well-known formation of colloids from layered clay structures. Preliminary experiments with layered WSe//2 suggest that this material may also form colloids by a similar mechanism.

Original languageEnglish (US)
Pages (from-to)1400-1402
Number of pages3
JournalJournal of physical chemistry
Volume92
Issue number6
DOIs
StatePublished - 1988
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

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