Studies of the Cataluminescence of Benzene Homologues on Nanosized γ–Al2O3/Eu2O3 and the Development of a Gas Sensor for Benzene Homologue Vapors

Sensors

Jieshan Lu²  Xiaoan Cao¹  Canying Pan²  Lianfeng Yang²  Guangbo Lai²  Jianling Chen² 

[1] Environmental Science and Engineering Institute, Guangzhou University, 510006, Guangzhou, P. R. China; E-mails

关键词: Cataluminescence;    benzene homologues;    gas sensor;    nanosized γ–Al₂O₃+Eu₂O₃;   

DOI  :  10.3390/s6121827

来源: mdpi

【 摘 要 】

The cataluminescence (CTL) of benzene and the benzene homologues toluene and xylene on nanosized γ–Al₂O₃ doped with Eu₂O₃ (γ–Al₂O₃/Eu₂O₃) was studied and a sensor of determining these gases was designed. The proposed sensor showed high sensitivity and selectivity at an optimal temperature of 432 ºC, a wavelength of 425 nm and a flow rate of 400 mL/min. Quantitative analysis was performed at the optimal conditions. The linear ranges of CTL intensity versus concentration of the benzene homologues were as follows: benzene 2.4~5000 mL/m³, toluene 4.0~5000 mL/m³ and xylene 6.8~5000 mL/m³, with detection limits (3σ) of 1.8 mL/m³, 3.0 mL/m³ and 3.4 mL/m³ for each one, respectively. The response time of this system was less than 3 s. The coexistence of other gases, such as SO_2, CO and NH_3, caused interference at levels around 11.7%, 5.8% and 8.9% respectively. The technique is a convenient and fast way of determining the vapors of benzene homologues in air.

【 授权许可】

Unknown   
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