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

• Autor(a) principal: Vioto, Gabriel C.N. [UNESP]
• Data de Publicação: 2020
• Outros Autores: Perfecto, Tarcísio M. [UNESP], Zito, Cecilia A. [UNESP], Volanti, Diogo P. [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1016/j.ceramint.2020.06.032; http://hdl.handle.net/11449/198989
• topic: Cobalt oxide; Gas sensor; Hard-template; P-type semiconductor; Selectivity; Volatile organic compounds

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.