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    基于纳米氧化铟表面的二硫化碳传感器研究

    2013-10-23 蔡苹杨

    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
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