基于納米氧化銦表面的二硫化碳傳感器研究
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
