摘  要：基于氧化铟（In2O3）纳米材料催化二硫化碳的氧化反应产生化学发光的现象，建立一种检测环境空气中痕量二硫化碳的催化发光气体传感器。研究结果表明：在检测波长460 nm、反应温度371 ℃、载气流速600 mL/min的最优条件下，考察二硫化碳浓度在0.42～21 μg/mL（r=0.999 3，n=6）间的响应情况，检出限为0.04 μg/mL（3σ），对21 μg/mL的二硫化碳连续平行测7次，其相对标准偏差为1.8%。此外，考察相同浓度的常见挥发性有机物的干扰情况，其结果表明该传感器具有很好的选择性。连续80h通过8.4 μg/mL的二硫化碳，发光强度无明显降低，相对标准偏差小于5%，表明此传感器使用寿命长。
关键词：纳米氧化铟；催化发光；二硫化碳；气体传感器
中图分类号：TP212.2；O659.32；TQ127.1+4；O614.37+2    文献标志码：A    文章编号：1674-5124（2013）05-0042-04
Research of gas sensor based on cataluminescence emission on the
surface of nano-In2O3
CAI Ping-yang， HUANG Cheng-yun， AN Jin-ling
（Chengdu Hydrology Team，Sichuan Provincial Bureau of Geology，Chengdu 610072，China）
Abstract: On the basis of cataluminescence（CTL） emission on the surface of Nano-In2O3， a novel and sensitive sensor for determing carbon disulfide was developed. The CTL’s characteristics and the optimal conditions， air flow rate of 600 mL/min， working temperature at 371 ℃ and wavelength at 460 nm were investigated. Under the optimized conditions， the linear range of CTL intensity versus concentration of ammonium sulfide was 0.42-21 μg/mL（r=0.999 3， n=6） with a detection limit of 0.04 μg/mL （3σ）. The relative standard deviation （RSD） for 21 μg/mL carbon disulfide was 1.8%（n=7）. Interference experiments showed that there was no response from common foreign substances， and the present sensor can be used for the coutinuously determing 8.4 μg/mL carbon disulfide more than 80 h over two weeks with a RSD less than 5%.
Key words: nano indium oxide； cataluminescence； carbon disulfide； gas sensor