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Infrared spectroscopy studies of iodoethane on Si(100)-2×1: Adsorption and thermal decomposition leading to adsorbate ordering

Authors :
K. M. Bulanin
Andrew V. Teplyakov
Ankit G. Shah
Source :
The Journal of Chemical Physics. 115:7187-7195
Publication Year :
2001
Publisher :
AIP Publishing, 2001.

Abstract

The adsorption and chemical transformation of iodoethane were studied on a Si(100)-2×1 surface using multiple-internal reflection Fourier-transform infrared spectroscopy (MIR-FTIR). The C–H and Si–H stretch vibrations served as fingerprints of all surface transformations. Although ethyl groups are stable on the Si(100)-2×1 surface at room temperature, thermal annealing studies suggest the reaction-limited formation of ethylene, a major hydrocarbon reaction product, accompanied by the loss of hydrogen, which is left on the surface until the temperature of recombinative H2 desorption is reached. Variable temperature studies indicate that ethyl groups are the only hydrocarbon entities on a surface up until the hydrogen elimination temperature. The positions of Si–H stretching bands suggest that a mixture of surface sites is formed at temperatures between 300 K and 600 K. However, the majority of surface hydrogen forms SiH–SiI surface species as the surface temperature reaches 700 K.

Details

ISSN :
10897690 and 00219606
Volume :
115
Database :
OpenAIRE
Journal :
The Journal of Chemical Physics
Accession number :
edsair.doi...........56535b5ea20d3a7dcfc17cee7fa2f2c8
Full Text :
https://doi.org/10.1063/1.1405156