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Catalytic combustion type hydrogen gas sensor using TiO_2 and UV-LED

机译：TiO_2和UV-LED的催化燃烧式氢气传感器

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摘要

A thick film catalytic gas sensor operable at a temperature of 82℃ in the presence of UV-LED (ultra violet-light emitting diode) has been developed to measure hydrogen concentration in the range of 0.5-5%. The sensing material as a combustion catalyst consists of TiO_2 (5 wt%) and Pd/Pt (20 wt%) supported on γ-Al_2O_3 powder. The reference material to compensate the heat capacity of it in a bridge circuit is γ-Al_2O_3 powder. A platinum heater and the sensor materials were formed on an alumina plate by a screen printing method, followed by heat treatment. The effect of UV irradiation in the presence of photocatalyst TiO_2 on the sensor response, response and recovery time has been investigated. The reduction of operating temperature from 253 to 82℃ for hydrogen gas sensing in the presence of UV radiation is attributed to the enhanced activity of the chemisorbed oxygen ions which facilitate a higher rate of reaction between O_2 and H_2.
机译：已经开发出一种厚膜催化气体传感器，该传感器可在存在UV-LED（超紫光发光二极管）的情况下在82℃的温度下工作，以测量0.5-5％范围内的氢浓度。作为燃烧催化剂的传感材料由负载在γ-Al_2O_3粉末上的TiO_2（5 wt％）和Pd / Pt（20 wt％）组成。补偿桥式电路中热容量的参考材料是γ-Al_2O_3粉末。通过丝网印刷法在氧化铝板上形成铂加热器和传感器材料，然后进行热处理。研究了在光催化剂TiO_2存在下紫外线辐射对传感器响应，响应和恢复时间的影响。在存在紫外线辐射的情况下，用于氢气检测的工作温度从253降至82℃，这归因于化学吸附氧离子的活性增强，从而促进了O_2和H_2之间更高的反应速率。

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