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Self‐assembled Azobenzenethiol Monolayer on Electrode Surfaces: Effect of Photo‐switching on the Surface and Electrical Property
Author(s) -
Wang SzuYing,
Huang DingChi,
Tao YuTai
Publication year - 2012
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201100467
Subject(s) - chemistry , azobenzene , monolayer , isomerization , electrode , work function , molecule , photochemistry , self assembled monolayer , metal , infrared , organic chemistry , optics , catalysis , biochemistry , physics
Azobenzenethiol molecules carrying different para ‐substituents were used to form mixed monolayers with n ‐alkanethiol molecules on Au and Ag surfaces. UV‐ and visible light irradiation of the surfaces resulted in reversible alternation of contact angle and characteristic infrared absorption peak intensities, as well as the work function of the metal surfaces. The alternations can be correlated with the cis‐trans isomerization of the azobenzene moieties at the surface. Electron transport from the metal electrode to a redox center in a contacting solution was measured and analyzed based on the change in the work function of the electrode as well as the monolayer film structure upon isomerization.