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Formation dynamics of hexadecanethiol self-assembled monolayers on (001) GaAs observed with photoluminescence and Fourier transform infrared spectroscopies

J. Appl. Phys. 106, 083518 (2009); doi:10.1063/1.3248370

Published 26 October 2009

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Chan-Kyu Kim,1 Gregory M. Marshall,1,2 Matthieu Martin,1 Michel Bisson-Viens,1 Zbigniew Wasilewski,3 and Jan J. Dubowski1
1Department of Electrical and Computer Engineering, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada
2Institute for Chemical Process and Environmental Technology, National Research Council of Canada, Ottawa, Ontario K1A 0R6, Canada
3Institute for Microstructural Sciences, National Research Council of Canada, Ottawa, Ontario K1A 0R6, Canada
The dynamics of hexadecanethiol (HDT) [HS(CH2)15CH3] chemisorption and the formation of a self-assembled monolayer (SAM) on the GaAs(001) surface was studied in situ by monitoring the photoluminescence (PL) intensity over a 20 h period. Comparing the PL time series in HDT solution with that of the bare GaAs surface similarly exposed to the ethanol solvent, we observed a two-phased evolution of the associated PL enhancement. Time-commensurate changes in the absorption frequency and intensity of the C–H stretching mode vibrations were then recorded using Fourier transform infrared spectroscopy, supporting that the PL enhancement corresponds directly with known mechanisms of ordered SAM formation. These results highlight the sensitivity with which in situ PL monitoring can reflect surface processes and underscores its potential for use in sensor applications. ©2009 American Institute of Physics
History: Received 31 May 2009; accepted 21 September 2009; published 26 October 2009
Permalink: http://link.aip.org/link/?JAPIAU/106/083518/1
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KEYWORDS and PACS

Keywords
PACS
  • 68.43.Mn
    Adsorption kinetics
  • 78.55.Kz
    Photoluminescence in solid organic materials
  • 68.35.Ja
    Solid surface and interface dynamics and vibrations
  • 78.30.Jw
    Infrared and Raman spectra in organic compounds, polymers
  • 07.07.Df
    Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
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