Reversible work function changes induced by photoisomerization of asymmetric azobenzene dithiol self-assembled monolayers on gold

Lloyd F.N. Ah Qune, H. Akiyama, T. Nagahiro, Kaoru Tamada, Andrew T.S. Wee

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38 Citations (Scopus)

Abstract

We measured reversible changes in the work function (Δ φAu) of gold substrates modified by asymmetric azobenzene dithiol self-assembled monolayers (SAMs) following photoisomerization and thermal recovery of the azo unit. The azobenzene derivative SAMs were photoisomerized to cis form by UV irradiation. Δ φAu was monitored in real time during thermal recovery to trans form by ultraviolet photoelectron spectroscopy using a synchrotron light source. Changing the substituted functional group in the p′ position of the azobenzene from electron donating to electron withdrawing resulted in opposite responses of Δ φAu against photoisomerization. Hence, a direct correlation between Δ φAu and changes in molecular dipole moments was obtained.

Original languageEnglish
Article number083109
JournalApplied Physics Letters
Volume93
Issue number8
DOIs
Publication statusPublished - Sep 15 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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