Electronic Structure Modulation at Molecule-Bimetallic Interface: an STM/STS Study of Single C60 at Biatomic Step Edge of Co/Cu(111)

碩士 === 國立臺灣大學 === 化學研究所 === 103 === Adsorbate-substrate interactions are important and typical subjects in surface science because the interactions modulate the electronic structures of the adsorbate and thus offer a tactic to modify the interfacial properties. At step edges, in addition to the unde...

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Main Authors: Chi-Feng Ying, 應奇峰
Other Authors: 陳俊顯
Format: Others
Language:en_US
Published: 2015
Online Access:http://ndltd.ncl.edu.tw/handle/yyu63w
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spelling ndltd-TW-103NTU050650422019-05-15T22:17:24Z http://ndltd.ncl.edu.tw/handle/yyu63w Electronic Structure Modulation at Molecule-Bimetallic Interface: an STM/STS Study of Single C60 at Biatomic Step Edge of Co/Cu(111) C60於鈷奈米島/Cu(111)的台階邊緣之掃描穿隧顯微術研究:雙金屬界面的C60電子結構 Chi-Feng Ying 應奇峰 碩士 國立臺灣大學 化學研究所 103 Adsorbate-substrate interactions are important and typical subjects in surface science because the interactions modulate the electronic structures of the adsorbate and thus offer a tactic to modify the interfacial properties. At step edges, in addition to the underneath substrate, lateral interactions from the vertical face of the step come into play. In this thesis work of C60, a bimetallic step edge was prepared by deposition of cobalt nanoislands on Cu(111). Hence, the effect on the electronic structures of C60 from the bimetallic substrate can be compared with that from the Cu(111) step edge. UHV-LT-STM/STS (ultrahigh vacuum-low temperature- scanning tunneling microscopy/spectroscopy) was employed to acquire, at the molecular level, STM images and STS spectra of C60 lodged at the edges of Cu steps and Co nanoislands on Cu(111). Topographic images for the former suggested an orientation of C60 with the hexagon ring facing Cu(111) and for the latter with a hexagon-pentagon bond resting on Cu(111). The discrepancy manifested the effect of aforementioned lateral interactions on the orientation of C60 adsorption. dI/dV spectra of C60 at Cu(111) step edge exhibited LUMO (lowest unoccupied molecular orbital) splitting, while at the edge of cobalt nanoislands additional splitting at the HOMO (highest occupied molecular orbital) level took place. The splitting involved the coupling of adsorbate states to those of the substrate. Different degrees of p-d hybridizations between C60 and metal atoms on the vertical face of the step are proposed for the disparities of dI/dV peaks. 陳俊顯 2015 學位論文 ; thesis 61 en_US
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language en_US
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sources NDLTD
description 碩士 === 國立臺灣大學 === 化學研究所 === 103 === Adsorbate-substrate interactions are important and typical subjects in surface science because the interactions modulate the electronic structures of the adsorbate and thus offer a tactic to modify the interfacial properties. At step edges, in addition to the underneath substrate, lateral interactions from the vertical face of the step come into play. In this thesis work of C60, a bimetallic step edge was prepared by deposition of cobalt nanoislands on Cu(111). Hence, the effect on the electronic structures of C60 from the bimetallic substrate can be compared with that from the Cu(111) step edge. UHV-LT-STM/STS (ultrahigh vacuum-low temperature- scanning tunneling microscopy/spectroscopy) was employed to acquire, at the molecular level, STM images and STS spectra of C60 lodged at the edges of Cu steps and Co nanoislands on Cu(111). Topographic images for the former suggested an orientation of C60 with the hexagon ring facing Cu(111) and for the latter with a hexagon-pentagon bond resting on Cu(111). The discrepancy manifested the effect of aforementioned lateral interactions on the orientation of C60 adsorption. dI/dV spectra of C60 at Cu(111) step edge exhibited LUMO (lowest unoccupied molecular orbital) splitting, while at the edge of cobalt nanoislands additional splitting at the HOMO (highest occupied molecular orbital) level took place. The splitting involved the coupling of adsorbate states to those of the substrate. Different degrees of p-d hybridizations between C60 and metal atoms on the vertical face of the step are proposed for the disparities of dI/dV peaks.
author2 陳俊顯
author_facet 陳俊顯
Chi-Feng Ying
應奇峰
author Chi-Feng Ying
應奇峰
spellingShingle Chi-Feng Ying
應奇峰
Electronic Structure Modulation at Molecule-Bimetallic Interface: an STM/STS Study of Single C60 at Biatomic Step Edge of Co/Cu(111)
author_sort Chi-Feng Ying
title Electronic Structure Modulation at Molecule-Bimetallic Interface: an STM/STS Study of Single C60 at Biatomic Step Edge of Co/Cu(111)
title_short Electronic Structure Modulation at Molecule-Bimetallic Interface: an STM/STS Study of Single C60 at Biatomic Step Edge of Co/Cu(111)
title_full Electronic Structure Modulation at Molecule-Bimetallic Interface: an STM/STS Study of Single C60 at Biatomic Step Edge of Co/Cu(111)
title_fullStr Electronic Structure Modulation at Molecule-Bimetallic Interface: an STM/STS Study of Single C60 at Biatomic Step Edge of Co/Cu(111)
title_full_unstemmed Electronic Structure Modulation at Molecule-Bimetallic Interface: an STM/STS Study of Single C60 at Biatomic Step Edge of Co/Cu(111)
title_sort electronic structure modulation at molecule-bimetallic interface: an stm/sts study of single c60 at biatomic step edge of co/cu(111)
publishDate 2015
url http://ndltd.ncl.edu.tw/handle/yyu63w
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