Synthesis and Ligand Exchange of Thiol-Capped Silicon Nanocrystals

Yixuan Yu, Clare E. Rowland, Richard D. Schaller, Brian A. Korgel

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29 Citations (Scopus)

Abstract

Hydride-terminated silicon (Si) nanocrystals were capped with dodecanethiol by a thermally promoted thiolation reaction. Under an inert atmosphere, the thiol-capped nanocrystals exhibit photoluminescence (PL) properties similar to those of alkene-capped Si nanocrystals, including size-tunable emission wavelength, relatively high quantum yields (>10%), and long radiative lifetimes (26-280 μs). X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy confirmed that the ligands attach to the nanocrystal surface via covalent Si-S bonds. The thiol-capping layer, however, readily undergoes hydrolysis and severe degradation in the presence of moisture. Dodecanethiol could be exchanged with dodecene by hydrosilylation for enhanced stability.

Original languageEnglish
Pages (from-to)6886-6893
Number of pages8
JournalLangmuir
Volume31
Issue number24
DOIs
Publication statusPublished - Jun 23 2015

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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