Maxwell displacement-current generation due to trans-cis photoisomerization in monolayer Langmuir–Blodgett film

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Abstract
The Maxwell displacement current was generated from 4-octyl-4′-(5-carboxylpentamethyleneoxy)-azobenzene (denoted as 8A5H) monolayer Langmuir–Blodgett films prepared on SnO2-coated glass substrates due to trans-cis photoisomerization of 8A5H by application of alternate irradiation with UV light and visible light. The generation of the displacement current by the photoirradiation was examined in connection with the degree of H-aggregate of 8A5H molecules. It was concluded that the high-H-aggregate molecule of the azobenzene group is not appropriate for the application of the molecular switching based on the displacement-current measurement.