Electronic States and Excited Electron Dynamics for Alkanethiolate SAM

• EGUCHI Toyoaki

  NAKAJIMA Designer Nanocluster Assembly Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology Agency Faculty of Science and Technology, Keio University

• NAKAYA Masato

  NAKAJIMA Designer Nanocluster Assembly Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology Agency Faculty of Science and Technology, Keio University

• SHIBUTA Masahiro

  NAKAJIMA Designer Nanocluster Assembly Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology Agency Faculty of Science and Technology, Keio University

• HIRATA Naoyuki

  NAKAJIMA Designer Nanocluster Assembly Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology Agency Faculty of Science and Technology, Keio University

• NAKAJIMA Atsushi

  NAKAJIMA Designer Nanocluster Assembly Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology Agency Faculty of Science and Technology, Keio University

Bibliographic Information

Other Title

• アルカンチオール自己組織化単分子膜の電子状態と励起電子ダイナミクス
• アルカンチオール ジコ ソシキカタンブンシマク ノ デンシ ジョウタイ ト レイキデンコ ダイナミクス

Abstract

The electronic structures of alkanethiolate self-assembled monolayers (SAMs) associated with their molecular-scale geometry have been evaluated by combining two types of scanning tunneling spectroscopy (STS): current-voltage (I/V) and distance-voltage (z/V) spectroscopy. In the STS spectra, in addition to electronic states originating from alkyl-chain and SAM/Au interface, an image potential state (IPS) formed in a vacuum gap is clearly observed. The result is well consistent with our two-photon photoemission spectroscopy (2PPES) measurements. Furthermore, by using time- and angle-resolved 2PPES, we found that the electron excited into IPS is highly separated from the Au substrate and has an extremely long lifetime of the order of 100 ps owing to the excellent insulating property of SAM. The lifetime can be prolonged by increasing the length of alkyl chain and by lowering the substrate temperature, which indicates that the degree of electron separation can be precisely controlled by designing the molecular layer.

Journal

• Hyomen Kagaku

  Hyomen Kagaku 35 (8), 432-437, 2014

  The Surface Science Society of Japan

Keywords

• self-assembled monolayer
• alkanethiol
• electronic state
• image potential state
• excited electron dynamics

Details

• CRID: 1390001206459103488
• NII Article ID: 130004678725
• NII Book ID: AN00334149
• DOI: 10.1380/jsssj.35.432
• ISSN: 18814743
• ISSN: 03885321
• NDL BIB ID: 025757549
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I025757549
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed