Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 315, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.128120
Keywords
Co3O4; Hierarchical assembly; BTX gases; Gas sensor
Funding
- National Natural Science Foundation of China [61704120, 61804109]
- ScienceAMP
- Technology Development Fund of Tianjin Education Commission for Higher Education [2018KJ219]
- China Postdoctoral Science Foundation [2018M630321]
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BTX (benzene, toluene and xylene) gases, as the aromatic group of volatile organic compounds (VOCs), are some of the most hazardous pollutants among VOCs. In order to achieve rapid selective detection of BTX gases, Co3O4 hierarchical porous architectures are constructed by porous nanosheets building blocks in a three dimensional assembly pattern. Without the addition of noble metals or the construction of heterostructures, Co3O4 hierarchical porous architectures based sensor shows superior selectivity, rapid response/recovery speed and well repeatability and stability toward BTX gases. Especially, Co3O4 hierarchical porous architectures based sensor exhibits an enhanced gas sensing response (59%) with a rapid response/recovery speed (1 s/16 s) toward 50 ppm xylene gas at a working temperature of 220 degrees C. The response time (1 s) toward xylene is the same as that of the other seven testing gases while the sensitivity (59%) toward 50 ppm xylene is 6.1, 6.3, 7.3, 7.7, 10.6, 3.5 and 1.5 times higher than that of ethanol, acetone, methanol, methanal, ammonia, benzene and toluene, respectively. The enhanced BTX gas sensing properties may originate from hierarchical porous structures and moderate catalytic activity in p-type semiconductor Co3O4, which not only provide tridimensional channels for BTX gas penetration and diffusion and more active sites for gas adsorption, but also facilitate and accelerate the oxidation of BTX gases. In particular, the gas sensing reaction toward the relatively more reactive xylene is promoted preferentially, leading to a higher xylene response.
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