Synthesis of alkyl-terminated silicon nanoclusters by a solution route

Chung Sung Yang, Richard A. Bley, Susan M. Kauzlarich, Howard W H Lee, Gildardo R. Delgado

Research output: Contribution to journalArticle

267 Citations (Scopus)

Abstract

We describe the synthesis and characterization of alkyl-capped nanocrystalline Si (R-n-Si) prepared by the reaction of SiCl4 with Mg2Si in ethylene glycol dimethyl ether (glyme) and surface-terminated with various alkyl groups, R-n-Si (R = methyl, ethyl, n-butyl, and n-octyl). This reaction produces crystalline nanoparticles with surfaces that can be chemically modified. The resultant crystalline nanoparticles can be suspended in organic solvents or isolated as a powder. The nanoclusters were characterized by transmission electron microscopy (TEM), high-resolution TEM, selected area electron diffraction (SAED), and Fourier transform infrared (FTIR) spectroscopy, electron paramagnetic resonance (EPR) spectroscopy, UV-vis absorption, and photoluminescence spectroscopy. The average cluster size depends on the reflux time of Mg2-Si with SiCl4, which provided nanoclusters with an average size of 2-5 nm. HRTEM confirms the presence of crystalline nanoclusters, and SAED is consistent with diamond-structured silicon. FTIR spectra are consistent with alkyl surface termination and show very little or no evidence for oxygen on the surface of the nanoclusters, depending on the surface alkyl group. The alkyl termination can be removed by reaction in air at 450 °C, and a Si-O stretch is observed in the FTIR spectra. EPR spectroscopy is consistent with crystalline Si nanoclusters and shows no signal at 4 K. The optical absorption spectra show an absorption edge between 260 and 240 nm, depending on the surface alkyl group, while a strong UV-blue photoluminescence between 315 and 520 nm is observed.

Original languageEnglish (US)
Pages (from-to)5191-5195
Number of pages5
JournalJournal of the American Chemical Society
Volume121
Issue number22
DOIs
StatePublished - Jun 9 1999

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Nanoclusters
Silicon
Spectrum Analysis
Electron Spin Resonance Spectroscopy
Fourier Analysis
Transmission Electron Microscopy
Nanoparticles
Electrons
Crystalline materials
Diamond
Fourier Transform Infrared Spectroscopy
Electron diffraction
Powders
Paramagnetic resonance
Fourier transforms
Air
Spectroscopy
Oxygen
Infrared radiation
Photoluminescence spectroscopy

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Yang, C. S., Bley, R. A., Kauzlarich, S. M., Lee, H. W. H., & Delgado, G. R. (1999). Synthesis of alkyl-terminated silicon nanoclusters by a solution route. Journal of the American Chemical Society, 121(22), 5191-5195. https://doi.org/10.1021/ja9828509

Synthesis of alkyl-terminated silicon nanoclusters by a solution route. / Yang, Chung Sung; Bley, Richard A.; Kauzlarich, Susan M.; Lee, Howard W H; Delgado, Gildardo R.

In: Journal of the American Chemical Society, Vol. 121, No. 22, 09.06.1999, p. 5191-5195.

Research output: Contribution to journalArticle

Yang, CS, Bley, RA, Kauzlarich, SM, Lee, HWH & Delgado, GR 1999, 'Synthesis of alkyl-terminated silicon nanoclusters by a solution route', Journal of the American Chemical Society, vol. 121, no. 22, pp. 5191-5195. https://doi.org/10.1021/ja9828509
Yang, Chung Sung ; Bley, Richard A. ; Kauzlarich, Susan M. ; Lee, Howard W H ; Delgado, Gildardo R. / Synthesis of alkyl-terminated silicon nanoclusters by a solution route. In: Journal of the American Chemical Society. 1999 ; Vol. 121, No. 22. pp. 5191-5195.
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