期刊
SURFACE SCIENCE
卷 604, 期 19-20, 页码 1791-1799出版社
ELSEVIER
DOI: 10.1016/j.susc.2010.07.007
关键词
Germanium; Infrared absorption spectroscopy; X-ray photoelectron spectroscopy; Density functional calculations; Organic functionalization; Chemisorption
资金
- National Science Foundation [CHE 0615087, CHE 0910717]
- Semiconductor Research Corporation via the Center for Advanced Interconnect Science and Technology (SRC) [1292.040]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0910717] Funding Source: National Science Foundation
The adsorption of tert-butyl isothiocyanate and tert-butyl isocyanate at the Ge(100) - 2 x 1 surface was probed using multiple internal reflection Fourier transform infrared (FTIR) spectroscopy X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) modeling. Results indicate that there are multiple surface products for each molecule. FUR studies of tert-butyl isothiocyanate reveal adsorption through an S-dative bonded state, while XPS studies further suggest a reactive desorption product which leaves excess sulfur atoms at the surface. Studies of tert-butyl isocyanate indicate that the molecule dissociatively adsorbs at the surface, resulting in tert-butyl and germyl isocyanate groups, as the major pathway, in addition to forming several minor products, including a [2 + 2] cycloaddition product across the C=N bond. OFT was used to simulate vibrational spectra and map the reaction pathways, and confirms that the assigned products are energetically favorable. (C) 2010 Elsevier B.V. All rights reserved.
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