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    基于納米氧化銦表面的二硫化碳傳感器研究

    2013-10-23 蔡蘋楊

    摘  要:基于氧化銦(In2O3)納米材料催化二硫化碳的氧化反應產生化學發光的現象,建立一種檢測環境空氣中痕量二硫化碳的催化發光氣體傳感器。研究結果表明:在檢測波長460 nm、反應溫度371 ℃、載氣流速600 mL/min的最優條件下,考察二硫化碳濃度在0.42~21 μg/mL(r=0.999 3,n=6)間的響應情況,檢出限為0.04 μg/mL(3σ),對21 μg/mL的二硫化碳連續平行測7次,其相對標準偏差為1.8%。此外,考察相同濃度的常見揮發性有機物的干擾情況,其結果表明該傳感器具有很好的選擇性。連續80h通過8.4 μg/mL的二硫化碳,發光強度無明顯降低,相對標準偏差小于5%,表明此傳感器使用壽命長。
    關鍵詞:納米氧化銦;催化發光;二硫化碳;氣體傳感器
    中圖分類號:TP212.2;O659.32;TQ127.1+4;O614.37+2    文獻標志碼:A    文章編號: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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