Catalytic combustion type hydrogen gas sensor using TiO2 and UV-LED
Catalytic combustion type hydrogen gas sensor using TiO2 and UV-LED
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DOI：
10.1016/j.snb.2007.02.017
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发表时间：
2007-07-16
影响因子：
8.4
通讯作者：
Singh, Kfishan C.
中科院分区：
文献类型：
--
作者：
Han, Chi-Hwan;Hong, Dae-Woong;Singh, Kfishan C.
已经开发出一种在紫外发光二极管（UV - LED）存在下可在82℃工作的厚膜催化气体传感器，用于测量0.5 - 5%范围内的氢气浓度。作为燃烧催化剂的传感材料由负载在γ - Al₂O₃粉末上的TiO₂（5 wt%，重量百分比）和Pd/Pt（20 wt%）组成。在桥式电路中用于补偿其热容量的参考材料是γ - Al₂O₃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TiO₂存在下紫外线照射对传感器响应、响应时间和恢复时间的影响。在紫外线辐射存在下，氢气传感的工作温度从253℃降低到82℃，这归因于化学吸附氧离子活性的增强，它促进了O₂和H₂之间更高的反应速率。（c）2007爱思唯尔有限公司。保留所有权利。
A thick film catalytic gas sensor operable at a temperature of 82 degrees C 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 TiO2 (5 wt%) and Pd/Pt (20 wt%) supported on gamma-Al2O3 powder. The reference material to compensate the heat capacity of it in a bridge circuit is gamma-Al2O3 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 TiO2 on the sensor response, response and recovery time has been investigated. The reduction of operating temperature from 253 to 82 degrees C 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. (c) 2007 Elsevier B.V. All rights reserved.