| Texto completo | |
| Autor(es): |
Gropelo, Henrique da Silva
;
Theodoro, Reinaldo dos Santos
;
dos Santos, Gustavo Sanghikian Marques
;
Perfecto, Tarcisio Micheli
;
Volanti, Diogo Paschoalini
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Alloys and Compounds; v. 1036, p. 12-pg., 2025-07-20. |
| Resumo | |
Metal oxide semiconductor sensors derived from metal-organic frameworks (MOFs) possess the potential to detect and recognize microbial volatile organic compounds (MVOCs). These materials hold promises for environmental, industrial, and medical monitoring applications. However, research on the influence of metal oxide crystallite sizes on sensor performance remains relatively limited. Consequently, we present the synthesis, characterization, and application of MOF-derived ZnO nanoparticles with varying crystallite sizes for the detection of MVOCs. The ZnO precursor utilized in this study was MOF-5, synthesized through a microwave-assisted solvothermal (MAS) method. Subsequently, MOF-5 was calcined at varying temperatures of 450, 600, and 800 degrees C to produce ZnO nanoparticles with sizes of 17.8 nm at 450 degrees C (ZnO-450), 26.8 nm at 600 degrees C (ZnO-600), and 34.3 nm at 800 degrees C (ZnO-800). These materials were evaluated as sensors to detect six distinct MVOCs (100 ppm) at operating temperatures ranging from 200 degrees C to 450 degrees C in dry air, including acetone, 2-butanone, mxylene, toluene, benzene, and 1-pentanol. The ZnO-450 sensor, characterized by the smallest crystallite size, exhibited the highest response, reaching 2680.0, to 1-pentanol at 400 degrees C. On the other hand, the ZnO-600 sensor, with a middle crystallite size, demonstrated an excellent response of 2205.0 to detect 1-pentanol at 400 degrees C in dry conditions. Notably, ZnO-600 exhibited superior selectivity for 1-pentanol compared to ZnO-450 and ZnO-800. Therefore, our findings demonstrated that the varying crystallite sizes of ZnO nanoparticles significantly impact sensor response and selectivity for 1-pentanol. Furthermore, the ZnO-600 sensor demonstrated satisfactory performance across a range of controlled relative humidity levels. (AU) | |
| Processo FAPESP: | 22/05381-1 - Heteroestruturas do tipo ZnO/NiO derivadas de estruturas metal-orgânicas para a detecção de compostos orgânicos voláteis microbianos |
| Beneficiário: | Reinaldo dos Santos Theodoro |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 22/14720-4 - Dos Átomos às Cerâmicas: Um Estudo de Microscopia Eletrônica de Transmissão sobre o Desenvolvimento de Materiais Transparentes |
| Beneficiário: | Tarcísio Micheli Perfecto |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 24/03388-4 - Influência dos defeitos eletrônicos e estruturais em sensores à base de In2O3 decorados com metais nobres para detecção de compostos orgânicos voláteis microbianos |
| Beneficiário: | Gustavo Sanghikian Marques dos Santos |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 20/06421-1 - Desenvolvimento de sensores derivados de estruturas metal-orgânicas para detecção de compostos orgânicos voláteis microbianos |
| Beneficiário: | Diogo Paschoalini Volanti |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |