オプティカルリン酸イオンセンサ [in Japanese] Optical Phoshate-Ion Sensor Based on Electrochromism of Metal-Oxide Thin-Film Electrode [in Japanese]
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Optical phosphate-ion sensors based on electrochromism of oxide thin-film electrodes were developed. Among the oxide thin-films tested, it was found that Co<sub>3</sub>O<sub>4</sub> and NiO -based electrodes prepared onto ITO glasses by a sol-gel method showed good sensing performance, i.e., the transmittance at 400-800nm of the electrodes changed reversibly depending on HPO<sub>4</sub><sup>2-</sup> concentration under applying anodic electrode potentials. The transmittance change of Co<sub>3</sub>O<sub>4</sub> based element at 620nm was almost linear to the logarithm of the HPO<sub>4</sub><sup>2-</sup> concentration between 1.0×10<sup>-6</sup> and 1.0×10<sup>-2</sup> M at+0.4 V vs. SCE. The 90% response time of the element, when the electrode potential was changed from +0.4 to 0 V vs. SCE at 1.0×10<sup>-2</sup> M, was about 50s at room temperature.
- The Journal of the Institute of Electrical Engineers of Japan
The Journal of the Institute of Electrical Engineers of Japan 119(5), 285-289, 1999-05
The Institute of Electrical Engineers of Japan