Development of a Nb-Doped TiO_2 Semiconductor pH Sensor for the Use in High-Temperature Aqueous Solutions

用于高温水溶液的掺铌TiO_2半导体pH传感器的研制

• 批准号: 02555145
• 负责人: SUGIMOTO Katsuhisa
• 金额: $ 2.94万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02555145/
• 关键词: TiO_2 single crystal; pH sensor; Mott-Schottky plot; Flatband potential; Oxide semiconductor; High temperature aqueous solution; Mott-Schottkyプロット

A semiconductor pH sensor using a Bh-doped TiO_2 single crystal has been developed for pH measurement in high temperature aqueous solutions. The pH response of this sensor is based on the pH-dependent change in the flatband potential, E_<fb>, of semiconductor electrode. The value of E_<fb> can be obtained by measuring the Mott-Schottky plot on the semiconductor electrode in a solution. The measurement of the plots has been done on the Nb_2O_5-doped TiO_2 single crystal electrodes with different doping levels in solutions having various composition and pH's at temperatures in the range 298-523K. It was found that the plots measured using the 0.01mass% Nb_2O_5-doped electrode at a frequency of 10Hz had good linearity under all experimental conditions used and the relationships between the values of E_<fb> and the solution pH's showed straight lines with the Nernstian slopes (-2.303RT/F). The pH of pure water at temperatures up to 523K could be measured by this electrode. The pH response of the sensor was fast, stable and not affected by redox systems in the solutions. Interfering effects were observed, however, at higher K^+ and Na^+ concentrations.

研制了一种用于高温水溶液pH测量的半导体pH传感器，该传感器采用BH掺杂的TiO_2单晶。该传感器的pH响应是基于半导体电极平带电位E_随pH的变化<fb>。通过<fb>测量溶液中半导体电极上的Mott-Schottky曲线可以获得E_的值。在298- 523 K温度范围内，在不同组成和pH值的溶液中，对不同掺杂量的Nb_2O_5掺杂的TiO_2单晶电极进行了曲线测量。结果表明，在10 Hz频率下，用0.01mass%Nb_2O_5电极测得的E_2值<fb>与溶液pH值呈线性关系，其能斯特斜率为-2.303RT/F。该电极可用于523 K以下纯水的pH值测量。该传感器的pH响应快速、稳定，不受溶液中氧化还原体系的影响。然而，在较高的K^+和Na^+浓度下观察到了干扰效应。

项目成果

Nobuyoshi Hara: "A Nb-doped TiO_2 Semiconductor pH Sensor for the Use in High-Temperature Aqueous Solutions" J. Electrochem. Soc.137. 2517-2523 (1990)

Nobuyoshi Hara：“一种用于高温水溶液的掺铌 TiO_2 半导体 pH 传感器”J. Electrochem。

Katsuhisa Sugimoto: "Semiconductor pH Sensor" Bull. Japan Inst. Metals. 29. 633-636 (1990)

Katsuhisa Sugimoto：“半导体 pH 传感器”公牛。

杉本 克久: "半導体電極型pHセンサ-" 日本金属学会会報. 29. 633-636 (1990)

Katsuhisa Sugimoto：“半导体电极型 pH 传感器”日本金属研究所公告 29. 633-636 (1990)。