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Alkane and alkanethiol passivation of halogenated Ge nanowires
Collins, Gillian; Fleming, Peter G.; Barth, Sven; O'Dwyer, Colm; Boland, John J.; Morris, Michael A.; Holmes, Justin D.
The ambient stability and surface coverage of halogen (Cl, Br, and I) passivated germanium nanowires were investigated by X-ray photoelectron and X-ray photoelectron emission spectroscopy. After exposure to air for 24 h, the stability of the halogen-terminated Ge nanowire surfaces toward reoxidation was found to improve with the increasing size of the halogen atoms, i.e., I > Br > Cl. Halogen termination was effective in removing the native Ge oxide (GeOx) and could also be utilized for further functionalization. Functionalization of the halogenated Ge nanowires was investigated using alkyl Grignard reagents and alkanethiols. The stability of the alkyl and alkanethiol passivation layers from the different halogen-terminated surfaces was investigated by X-ray photoelectron spectroscopy and attenuated total reflectance infrared spectroscopy. Alkanethiol functionalized nanowires showed greater resistance against reoxidation of the Ge surface compared to alkyl functionalization when exposed to ambient conditions for 1 week.
Keyword(s): Iodine; Alkylation; Bromine; Chlorine; Electrons; Emission spectroscopy; Germanium; Halogenation; Infrared spectroscopy; Nanowires; Paraffins; Passivation; Photons; X ray photoelectron spectroscopy; X rays
Publication Date:
Type: Journal article
Peer-Reviewed: Yes
Language(s): English
Institution: University College Cork
Funder(s): Science Foundation Ireland; Higher Education Authority
Citation(s): Collins, G., Fleming, P., Barth, S., O'Dwyer, C., Boland, J. J., Morris, M. A. and Holmes, J. D. (2010) 'Alkane and Alkanethiol Passivation of Halogenated Ge Nanowires', Chemistry of Materials, 22(23), pp. 6370-6377. doi: 10.1021/cm1023986
Publisher(s): American Chemical Society (ACS)
File Format(s): application/pdf
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First Indexed: 2018-08-29 06:31:15 Last Updated: 2019-06-20 06:34:55