期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 282, 期 -, 页码 331-338出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.11.072
关键词
Heterojunction; Composite semiconductor; Toluene; Xylene; NiO; NiGa2O4
资金
- National Natural Science Foundation of China (NSFC) [21771079]
- National Key R&D Program of China [2017YFA0207800]
- Jilin Province Science and Technology Development Plan [20170101141JC]
- Young Elite Scientist Sponsorship Program by CAST
- Jilin Province Industrial Innovation Special Fund Project of China [2017C052-1]
- Postdoctoral Innovative Talent Support Program [BX20180120]
- China Postdoctoral Science Foundation [2018M641772]
- NSFC [21621001]
- 111 Project [B17020]
The selective detection of methyl benzene (e.g. toluene and xylene) using oxide semiconductor-based gas/vapor sensors is highly desirable but limited by the low chemical reactivity of the benzene compounds. Exploiting p-type semiconductor oxides (e.g., NiO) which provide distinctive catalytic activities for methyl benzene detection is an essential approach. However, the intrinsic responses of p-type semiconductor oxides are often low. In this paper, high-performance toluene and xylene detection has been realized by a sensor based on novel p-p heterojunction NiGa2O4-NiO nanospheres. Construction of optimized p-p heterojunctions, which resulting from the rationally controlling of the NiGa2O4 content in NiGa2O4-NiO, leads to significantly promoted sensing properties for toluene and xylene detection. It is found that the sensor based on 50% NiGa2O4-NiO exhibits the best sensing performances. Its highest response (R-g/R-a = 12.7 to toluene; R-g/R-a = 16.3 to xylene) is almost 10 times higher than that of the pure NiO (R-g/R-a < 2) to 100 ppm toluene and xylene at 230 degrees C. More importantly, the sensor exhibits superior selectively for detection of the methyl benzene even against more reactive interfering gases/vapors, such as formaldehyde and ethanol. The p-p oxide heterojunction suggests a promising sensing material for toluene and xylene detection with high response, excellent selectivity, good stability and rapid response/recover time.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据