Photocurrent Response of Photoreceptive Devices Using a Retinoid Immobilized in a Chitosan Gel Film
Photocurrent Response of Photoreceptive Devices Using a Retinoid Immobilized in a Chitosan Gel Film
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DOI：
10.1143/jjap.49.127003
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发表时间：
2010-01-01
影响因子：
1.5
通讯作者：
Mitachi，Seiko
中科院分区：
文献类型：
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作者：
Tsuchida，Yosuke;Hidaka，Akira;Mitachi，Seiko
为了实现具有仿生功能的生物光子器件，我们对人眼视网膜进行了研究。将全反式视黄醛固定在壳聚糖凝胶膜上，制成光感受器。该器件用氧化铟锡（ITO）涂覆的玻璃和金涂覆的玻璃电极（ITO-Au）或两端使用ITO电极（ITO-ITO）制备。每个器件在4V的施加电压下用365 nm紫外光照射20 s间隔。光电流响应与紫外光的开-关状态同步，并且ITO-ITO器件的光电流响应比ITO-Au器件的光电流响应高约16倍。我们寻找最佳的施加电压，因为ITO-ITO器件在第二天在4V下劣化，并且发现3V在再生前后的器件中都产生光电流响应。制备了使用三种类视色素（全反式视黄醇、全反式视黄酸和全反式视黄醇）的进一步ITO-ITO器件。通过类似的方法测量的光电流反应持续331天，使用视网膜，313天，使用视黄酸，和59天，使用视黄醇。此外，在这些ITO-ITO器件的再生后凝胶膜中也观察到光电流响应。这些光感受器件可以应用于生物功能光学传感或未来的视觉信息处理设备。
In order to realize a biophotonic device with biomimetic functions, we focus on the retinal in human eyes. A photoreceptive device was prepared using all-trans retinal immobilized in a gel film chitosan. This device was prepared with either indium tin oxide (ITO)-coated glass and gold-coated glass electrodes (ITO–Au), or using ITO electrodes for both ends (ITO–ITO). Each device was irradiated with 365 nm ultraviolet light for 20 s intervals at an applied voltage of 4 V. The photocurrent response was synchronized to the ON–OFF states of the ultraviolet light and was about 16 times higher for an ITO–ITO device than for an ITO–Au device. We searched for the optimum applied voltage because the ITO–ITO devices deteriorated on the second day at 4 V and found that 3 V produced a photocurrent response in both pre-and post-regenerated devices. Further ITO–ITO devices using three kinds of retinoids (all-trans retinal, all-trans retinoic acid, and all-trans retinol) were prepared. Photocurrent responses measured by a similar method persisted for 331 days using retinal, 313 days using retinoic acid, and 59 days using retinol. Furthermore, the photocurrent response was also observed in post-regenerated gel films of these ITO–ITO devices. These photoreceptive devices could be applied to bio-functional optical sensing or to future visual information processing devices.