Synthesis and Ligand Exchange of Thiol-Capped Silicon Nanocrystals

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

Research output: Contribution to journalArticle

28 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

Fingerprint

Silicon
Sulfhydryl Compounds
thiols
Nanocrystals
Ion exchange
nanocrystals
Ligands
ligands
silicon
synthesis
Hydrosilylation
inert atmosphere
Alkenes
Quantum yield
radiative lifetime
Silanes
moisture
alkenes
Olefins
hydrides

ASJC Scopus subject areas

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

Cite this

Synthesis and Ligand Exchange of Thiol-Capped Silicon Nanocrystals. / Yu, Yixuan; Rowland, Clare E.; Schaller, Richard D; Korgel, Brian A.

In: Langmuir, Vol. 31, No. 24, 23.06.2015, p. 6886-6893.

Research output: Contribution to journalArticle

Yu, Yixuan ; Rowland, Clare E. ; Schaller, Richard D ; Korgel, Brian A. / Synthesis and Ligand Exchange of Thiol-Capped Silicon Nanocrystals. In: Langmuir. 2015 ; Vol. 31, No. 24. pp. 6886-6893.
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