Photoisomerization of azobenzene dendrimer monolayer investigated by Maxwell displacement current technique

Daisuke Shimura, Takaaki Manaka, Masayuki Nakamoto, Wei Zhao, Yutaka Majima, Mitsumasa Iwamoto, Shiyoshi Yokoyama, Tohru Kubota, Shinro Mashiko

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Photoisomerization in monolayers of a novel azobenzene compound, azobenzene dendrimer, was investigated for the first time by means of the absorption spectrum and Maxwell displacement current (MDC) technique. According to the absorption spectrum, trans-to-cis conversion ratio was estimated to be approximately 10% for the third generation of azobenzene dendrimer deposited onto a glass substrate. Temperature-dependent induced charge with trans-cis isomerization was also measured by means of MDC technique, and we found that the thermal isomerization process must be taken into account for theoretical analysis of trans-to-cis photoisomerization. The temperature dependence was theoretically treated in terms of the three-state model that takes into account the stimulated thermal isomerization. As a result, we could obtain a ground state energy barrier of 0.93 eV in cis-to-trans isomerization for the first-generation of the azobenzene dendrimer (AZ-G1), and the value is in good agreement with the previous results obtained from the molecular orbital (MO) calculation which suggests that thermal cis-to-trans isomerization in AZ-G1 passes through the inversion process.

Original languageEnglish
Pages (from-to)7085-7090
Number of pages6
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume40
Issue number12
DOIs
Publication statusPublished - Dec 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Photoisomerization of azobenzene dendrimer monolayer investigated by Maxwell displacement current technique'. Together they form a unique fingerprint.

Cite this