| Autor: |
Tsuchida, Yosuke, Ikeda, Yasukazu, Kobayashi, Naohiro, Arakawa, Takamasa, Yamano, Shinichiro, Mitachi, Seiko |
| Zdroj: |
Japanese Journal of Applied Physics; Mar2009, Vol. 48 Issue 3R, p1-1, 1p |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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