Abstract
Optical absorption of retinoids, retinal and retinoic acid, in immobilized thin films were measured and evaluated using films fabricated by spin coating, Langmuir–Blodgett (LB), and layer-by-layer self-assembly methods. We succeeded in forming thin films of immobilized retinoids fabricated by self-assembly methods for the first time. Based on measurements with an atomic force microscope (AFM), it is estimated that film thickness was about 30 nm, with a total of sixteen layers. The photoisomerization reaction rate of the self-assembled film was found to be much more suppressed than that of LB films. Photoreceptive devices were built around films produced using a chitosan sol and immobilized retinoids in a self-assembled film, and the photocurrent responses of these devices were measured. Photoreceptive biophotonic devices using a self-assembled film showed photocurrent response by irradiation of ultraviolet light of 254 nm. Photocurrent response of the self-assembled films was faster than that of sol-based films. These nanoscale photoreceptive devices may be applied to bio-functional optical sensing or to future visual information processing devices.
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