(The) adsorption structure of purine on the Ge(100) surface = Ge(100)표면 위의 purine 분자의 흡착에 관한 연구

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The adsorption of purine on Ge(100) has been investigated using Auger electron spectroscopy (AES), temperature-programmed desorption (TPD), scanning tunneling microscopy (STM) and the density functional theory (DFT) calculation. From the ratio of C(KLL) / Ge(MNN) Auger peak intensities, we find that the surface coverage of purine molecules increases with increasing the exposure and reached saturation after the dosing of 8 minutes (θ = 0.25 ML). In TPD spectra, both chemisorbed and physisorbed purine molecules are observed to be present at the temperature of 110 K. Chemisorbed purine molecularly desorbs at 620 K while physisorbed purine at 140 K. It is also found that Purine molecularly desorbed following the first order kinetics, and the desorption energy is 38.67 kcal/mol. The STM image shows that the adsorbed purine molecules reside between the the buckled dimmer rows and bind to the down Ge atoms of the dimers forming local c(4×2) and p(2×2) reconstructions. Accordiong to the DFT calculation based on a four-dimer Ge cluster, the energetcially most stable adsorption geometry is that purine is chemisorbed on Ge(100) making two dative bonds between two N-atoms of purine and down atoms in Ge dimer. These results are in good agreement with the the experimental results.
Advisors
Kim, Se-Hunresearcher김세훈researcher
Description
한국과학기술원 : 화학과,
Publisher
한국과학기술원
Issue Date
2004
Identifier
237865/325007  / 020023556
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 화학과, 2004.2, [ vi, 39 p. ]

Keywords

TPD; STM; GE(100); PURINE; AES; 오제전자분광법; 열탈착분광법; 주사터널링 현미경; 게르마늄; 퓨린

URI
http://hdl.handle.net/10203/31979
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=237865&flag=dissertation
Appears in Collection
CH-Theses_Master(석사논문)
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