Variation of Coverage-Dependent Attachment of Multifunctional Groups in Alanine and Leucine to the Ge(100)-2 x 1 Surface: Bonding Configuration and Adsorption Stability
- Authors
- Yang, Sena; Park, Youngchan; Kim, Jeong Won; Lee, Hangil
- Issue Date
- Oct-2011
- Publisher
- AMER CHEMICAL SOC
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY C, v.115, no.39, pp 19287 - 19292
- Pages
- 6
- Journal Title
- JOURNAL OF PHYSICAL CHEMISTRY C
- Volume
- 115
- Number
- 39
- Start Page
- 19287
- End Page
- 19292
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/12475
- DOI
- 10.1021/Jp206442s
- ISSN
- 1932-7447
1932-7455
- Abstract
- The coverage-dependent attachment of multifunctional groups included in alanine and leucine molecules adsorbed to the Ge(100)-2 x 1 surface was investigated and compared using core-level photoemission spectroscopy (CLPES) and density functional theory (DFT) calculations. The bonding configuration, stability, and adsorption energies were evaluated for two different coverage levels. In both molecules, the core-level spectra at a low coverage indicated that both the carboxyl and amine groups participated in the bonding with the Ge(100) surface by "O-H dissociated and N-dative bonded structure". This is consistent with the D FT calculation results showing that such adsorption geometry is the most stable and follows the minimum reaction pathway. However, at high coverage level, an additional adsorption geometry of "O-H dissociation bonded structure" appeared possibly to minimize the steric hindrance between adsorbed molecules.
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