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Journal Article Dissociative Chemisorption of Methanol on Ge(100)
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Authors
배성수, 김도환, Kim Ansoon, 정순정, 홍석륜, 김세훈
Issue Date
200710
Source
The Journal of Physical Chemistry C, v.111 no.41, pp.15013-15019
ISSN
1932-7447
Publisher
American Chemical Society(ACS)
DOI
https://dx.doi.org/10.1021/jp073656o
Project Code
07MB2700, Ubiquitous Health Monitoring Module and System Development, Park Seon Hee
Abstract
The adsorption of methanol (CH3OH) on Ge(100) surface has been studied using ultrahigh vacuum scanning tunneling microscopy (UHV - STM) and density functional theory (DFT) calculations. At low coverages, high-resolution experimental STM shows that methanol undergoes O - H bond dissociative adsorption on a single Ge - Ge dimer. As the methanol coverage increases to saturation, a series of dissociative adsorptions of methanol results in the formation of dimer row-based chainlike arrays. The DFT calculations show that, at room temperature, O - H bond dissociative adsorption is kinetically more favorable than C - O bond dissociative adsorption, although the final product of C - O bond dissociative adsorption is more stable geometry thermodynamically. From the results of our STM experiments and DFT calculations, we conclude that the adsorption structure of methanol on Ge(100) at room temperature has a H - Ge - Ge - OCH3 geometry as a result of O - H bond dissociative adsorption on a single dimer. © 2007 American Chemical Society.
KSP Keywords
Dissociative adsorption, Final product, H bond, High-resolution, Room-temperature, adsorption structure, density functional theory (DFT) calculations, dissociative chemisorption, ultrahigh vacuum scanning tunneling microscopy(UHV-STM)