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Webb LJ, Rivillon S, Michalak DJ, et al. Transmission infrared spectroscopy of methyl- and ethyl-terminated silicon(111) surfaces. J Phys Chem B. 2006;110(14):7349-56doi: 10.1021/jp054618c.
Webb, L. J., Rivillon, S., Michalak, D. J., Chabal, Y. J., & Lewis, N. S. (2006). Transmission infrared spectroscopy of methyl- and ethyl-terminated silicon(111) surfaces. The journal of physical chemistry. B, 110(14), 7349-56. https://doi.org/10.1021/jp054618c
Webb, Lauren J, et al. "Transmission infrared spectroscopy of methyl- and ethyl-terminated silicon(111) surfaces." The journal of physical chemistry. B vol. 110,14 (2006): 7349-56. doi: https://doi.org/10.1021/jp054618c
Webb LJ, Rivillon S, Michalak DJ, Chabal YJ, Lewis NS. Transmission infrared spectroscopy of methyl- and ethyl-terminated silicon(111) surfaces. J Phys Chem B. 2006 Apr 13;110(14):7349-56. doi: 10.1021/jp054618c. PMID: 16599509.
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J Phys Chem B. 2006 Apr 13;110(14):7349-56. doi: 10.1021/jp054618c.

Transmission infrared spectroscopy of methyl- and ethyl-terminated silicon(111) surfaces.

The journal of physical chemistry. B

Lauren J Webb, Sandrine Rivillon, David J Michalak, Yves J Chabal, Nathan S Lewis

Affiliations

  1. Division of Chemistry and Chemical Engineering, California Institute of Technology, 210 Noyes Laboratory, Pasadena, California 91125, USA.

PMID: 16599509 DOI: 10.1021/jp054618c

Abstract

Transmission infrared spectroscopy (TIRS) has been used to investigate the surface-bound species formed in the two-step chlorination/alkylation reaction of crystalline (111)-oriented Si surfaces. Spectra were obtained after hydrogen termination, chlorine termination, and reaction of the Cl-Si(111) surface with CH(3)MgX or C(2)H(5)MgX (X = Cl, Br) to form methyl (CH(3))- or ethyl (C(2)H(5))-terminated Si(111) surfaces, respectively. Freshly etched H-terminated Si(111) surfaces that were subsequently chlorinated by immersion in a saturated solution of PCl(5) in chlorobenzene were characterized by complete loss of the Si-H stretching and bending modes at 2083 and 627 cm(-1)(,) respectively, and the appearance of Si-Cl modes at 583 and 528 cm(-1). TIRS of the CH(3)-terminated Si(111) surface exhibited a peak at 1257 cm(-1) polarized perpendicular to the surface assigned to the C-H symmetrical bending, or "umbrella" motion, of the methyl group. A peak observed at 757 cm(-1) polarized parallel to the surface was assigned to the C-H rocking motion. Alkyl C-H stretch modes on both the CH(3)- and C(2)H(5)-terminated surfaces were observed near 2900 cm(-1). The C(2)H(5)-terminated Si(111) surface additionally exhibited broad bands at 2068 and 2080 cm(-1), respectively, polarized perpendicular to the surface, as well as peaks at 620 and 627 cm(-1), respectively, polarized parallel to the surface. These modes were assigned to the Si-H stretching and bending motions, respectively, resulting from H-termination of surface atoms that did not form Si-C bonds during the ethylation reaction.

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