Anderson, Sarah (2000) Second-harmonic generation as a probe of chemically modified Si(111) surfaces and the initial oxidation of hydrogen terminated Si(111). Masters thesis, Concordia University.
Optical second-harmonic generation (SHG) is used to probe Si(111) surfaces with covalently attached monolayers. The surfaces are prepared using wet chemical modification to form -H, -C 10 H 21 (decyl) and -O-C 10 H 21 (decyloxy) monolayers. The SHG efficiency for these surfaces as well as a Si(111) surface with a native oxide film is reported. The signal's intensity and modulation through a 360 ̕rotation, or rotational anisotropy, can be correlated with the substrate's chemical modification. The potential for SHG to be used as a probe for monitoring the initial oxidation of Si(111)-H in situ is investigated. The mechanism by which this reaction occurs over time is not well understood. Three environments have been studied: N 2 purge to inhibit oxidation, oxidation in ambient air, and photo-oxidation in ambient air using UV irradiation. Possible processes by which water and molecular oxygen initiate the surface oxidation are identified.
|Divisions:||Concordia University > Faculty of Arts and Science > Chemistry and Biochemistry|
|Item Type:||Thesis (Masters)|
|Pagination:||xi, 101 leaves : ill. ; 29 cm.|
|Degree Name:||Theses (M.Sc.)|
|Program:||Chemistry and Biochemistry|
|Thesis Supervisor(s):||Capobianco, John A|
|Deposited By:||Concordia University Libraries|
|Deposited On:||27 Aug 2009 13:18|
|Last Modified:||08 Dec 2010 10:19|
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