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http://dx.doi.org/10.5012/bkcs.2009.30.6.1309

Surface Potential Change Depending on Molecular Orientation of Hexadecanethiol Self-Assembled Monolayers on Au(111)  

Ito, Eisuke (Flucto-order Functions Asian Collaboration Team, RIKEN)
Arai, Takayuki (Department of Electronic Chemistry, Tokyo Institute of Technology)
Hara, Masahiko (Department of Electronic Chemistry, Tokyo Institute of Technology)
Noh, Jaegeun (Department of Chemistry, Hanyang University)
Publication Information
Bulletin of the Korean Chemical Society / v.30, no.6, 2009 , pp. 1309-1312 More about this Journal
Abstract
Surface potential and growth processes of hexadecanethiol (HDT) self-assembled monolayers (SAMs) on Au(111) surfaces were examined by Kelvin probe method and scanning tunneling microscopy. It was found that surface potential strongly depends on surface structure of HDT SAMs. The surface potential shift for the striped phase of HDT SAMs chemisorbed on Au(111) surface was +0.45 eV, which was nearly the same as that of the flat-lying hexadecane layer physisorbed on Au(111) surface. This result indicates that the interfacial dipole layer induced by adsorption of alkyl chains is a main contributor to the surface potential change. In the densely-packed HDT monolayer, further change of the surface potential was observed, suggesting that the dipole moment of the alkanethiol molecules is an origin of the surface potential change. These results indicate that the work function of a metal electrode can be modified by controlling the molecular orientation of an adsorbed molecule.
Keywords
Surface potential; Work function change; Self-assembled monolayer; Kelvin probe method; Scanning tunneling microscopy;
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