Issue 10, 2001
From the journal:

Physical Chemistry Chemical Physics

Discrimination of functional groups with scanning tunneling microscopy using chemically modified tips: Recognition of ether oxygens through hydrogen bond interactions

Tomoaki Nishino,a   Philippe Bühlmann,†a   Takashi Itob  and  Yoshio Umezawa*a  

* Corresponding authors

a Department of Chemistry, School of Science, The Uniersity of Tokyo, Bunkyo-Ku, Tokyo, Japan
E-mail: umezawa@chem.s.u-tokyo.ac.jp
Fax: Fax: + 81-3-5841-8349
Tel: Tel: + 81-3-5841-4351

b Department of Chemistry, Science Uniersity of Tokyo, Shinjuku-Ku, Tokyo, Japan

Abstract

Gold tips modified with self-assembled monolayers were used for the scanning tunneling microscopy (STM) observation of monolayers of dihexadecyl ether and 1,11-bis(hexadecyloxy)undecane physisorbed onto highly ordered pyrolytic graphite. The ether oxygens gave dark lines in STM images measured with unmodified and thiophenol-modified tips. In contrast, they appeared as bright lines in images observed with tips modified with 4-mercaptobenzoic acid, allowing the selective recognition of ether oxygens. These changes in image contrasts for ether oxygens appear to result from the facilitation of electron tunneling by hydrogen bond interactions between the ether oxygens of the samples and the carboxyl group of 4-mercaptobenzoic acid on the tips.

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Article information

DOI
https://doi.org/10.1039/B100685L
Article type
Paper
Submitted
18 Jan 2001
Accepted
15 Mar 2001
First published
12 Apr 2001

Phys. Chem. Chem. Phys., 2001,3, 1867-1869

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Discrimination of functional groups with scanning tunneling microscopy using chemically modified tips: Recognition of ether oxygens through hydrogen bond interactions

T. Nishino, P. Bühlmann, T. Ito and Y. Umezawa, Phys. Chem. Chem. Phys., 2001, 3, 1867 DOI: 10.1039/B100685L

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