Enhancement of 2-butanone sensing properties of SiO2@CoO core-shell structures

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Vioto, Gabriel C.N. [UNESP]
Perfecto, Tarcísio M. [UNESP]
Zito, Cecilia A. [UNESP]
Volanti, Diogo P. [UNESP]

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Volatile organic compounds (VOCs) can be associated with some diseases when found in human exhaled breath as a result of alterations in metabolic pathways. Therefore, the development of highly selective sensors to a particular VOC is required. In this paper, we used silica (SiO2) nanospheres as support for the growth of cobalt (II) oxide (CoO) nanosheets, resulting in the SiO2@CoO core-shell structure with a high specific surface area. This structure was applied as a chemoresistive VOCs sensor. The SiO2@CoO material exhibited increased sensitivity to 2-butanone in comparison with acetone, methanol, ethanol, isopropanol, acetaldehyde, benzene, toluene, and m-xylene. The response to 100 ppm of 2-butanone was ~44.7, with a response time of 27 s. The enhanced performance might be attributed to the high surface area provided by the unique core-shell structure with 2D CoO nanosheets.



Cobalt oxide, Gas sensor, Hard-template, P-type semiconductor, Selectivity, Volatile organic compounds

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Ceramics International, v. 46, n. 14, p. 22692-22698, 2020.