Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2021-06-02 , DOI: 10.1016/j.jhazmat.2021.126290
Ning Sui 1 , Shuang Cao 1 , Peng Zhang 1 , Tingting Zhou 1 , Tong Zhang 1
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Crystalline phase regulation could optimize the band gap, which has a great impact on the amount of chemisorbed gas molecules on the gas sensing materials. Herein, a facile route of hydrothermal method followed by calcination treatment was used to synthesize cubic bixbyite-type (C-In2O3), rhombohedral corundum-type (Rh-In2O3) and the mixed phase In2O3 (Rh+C-In2O3). The band gap of C-In2O3 was narrowed to a suitable value (2.38 eV) and the relative percentage of chemisorbed oxygen was enhanced (31.8%). The sensing results to ozone (O3) indicated that the C-type structure stood out. The gas sensor based on C-In2O3 exhibited extraordinary O3 sensing performances with a response of 5.7 (100 ppb) and an ultralow limit of detection of 30 ppb. The amazing results could be attributed to the narrow band gap and the enrichment of chemisorbed oxygen. This work inspires a new perspective to design highly sensitive and reliable O3 sensors.
中文翻译:
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In2O3不同晶相对臭氧传感性能的影响
晶相调节可以优化带隙,这对气敏材料上化学吸附的气体分子的数量有很大影响。本文采用水热法和煅烧处理的简便路线合成立方方方锰矿型(C-In 2 O 3)、菱形刚玉型(Rh-In 2 O 3)和混合相In 2 O 3( Rh+C-In 2 O 3 )。C-In 2 O 3的带隙缩小到合适的值(2.38 eV),化学吸附氧的相对百分比提高(31.8%)。臭氧(O 3) 表明 C 型结构突出。基于 C-In 2 O 3的气体传感器表现出非凡的 O 3传感性能,响应为 5.7 (100 ppb),超低检测限为 30 ppb。惊人的结果可归因于窄带隙和化学吸附氧的富集。这项工作激发了设计高灵敏度和可靠 O 3传感器的新视角。