Initial Oxidation of Alkanethiol-Covered Copper Studied by Vibrational Sum Frequency Spectroscopy
2011 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 115, no 48, 23871-23879 p.Article in journal (Refereed) Published
The oxidation of octadecanethiol (ODT, CH3-(CH2)17SH)-covered copper in dry air has been studied by in situ vibrational sum frequency spectroscopy (VSFS), infrared reflection absorption spectroscopy (IRAS), and cathodic reduction (CR). During the first 10 h of exposure, the VSF spectral line shape in the CH stretching region changed
significantly, with resonances observed as dips being transformed into peaks. This was attributed to a phase change in the nonresonant sum frequency signal due to the formation of a thin layer of copper(I) oxide beneath the ODT. Complementary cathodic reduction and infrared reflection/absorption spectroscopy studies yielded a thickness of the oxide layer of <2 nm after 19 h exposure. An orientation analysis on the adsorbed molecules by VSFS indicated a decreased tilt angle of the terminating methyl groups with respect to the surface normal during the formation of the oxide layer.
Place, publisher, year, edition, pages
American Chemical Society (ACS), 2011. Vol. 115, no 48, 23871-23879 p.
Other Chemistry Topics
IdentifiersURN: urn:nbn:se:kth:diva-67442DOI: 10.1021/jp207028eISI: 000297446300028ScopusID: 2-s2.0-82555167517OAI: oai:DiVA.org:kth-67442DiVA: diva2:484952
FunderSwedish Research Council
QC 201202072012-02-072012-01-272013-12-06Bibliographically approved