Transition metal (Nb and W) doped TiO2 nanostructures: The role of metal doping in their photocatalytic activity and ozone gas-sensing performance

Autor(es)

Santos, Emerson ^[1] ; Catto, Ariadne C. ^{[2, 1]} ; Peterline, Allan F. ^[1] ; Avansi Jr, Waldir

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, UFSCar, Lab Nanostruct Multifunct Mat, Dept Phys, BR-13565905 Sao Carlos - Brazil

^[2] Univ Fed Sao Carlos, Ctr Dev Funct Mat CDMF, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Applied Surface Science; v. 579, MAR 30 2022.
• Citações Web of Science: 0

Resumo

Semiconducting metal oxide nanostructures have drawn much attention from the researchers due to several advantages related to their wide-ranging applications, such as photocatalytic activity and gas-sensing performance. In this way, the effect of metal ions on the structural, morphological and electronic properties of the asprepared samples were investigated by X-ray diffraction (XRD), Raman spectroscopy, UV-visible diffuse reflectance spectra (DRS), X-ray photoelectron spectroscopy (XPS) and electron microscopy techniques. XRD analysis confirmed that all MxTi1\_xO2 (M = Nb and W) samples presented only the TiO2 anatase phase despite the different amounts of dopant. Additionally, scanning electron microscopy (SEM) showed that the increased metal ion content leads to a morphological evolution from anisotropic to isotropic nanostructures, which consequently reduces their size. It was observed that the presence of W and Nb as dopants clearly induces a change in the surface characteristics of the nanostructures, favoring the photodegradation of cationic dyes, which does not occur for Rhodamine (RhB) since the photocatalytic mechanism appears strictly related to carrier charges. From the studied samples, W0.29Ti0.71O2 presented interesting ozone (O3) gas-sensing performance, which was evidenced by their working temperature (below 150 degrees C), sensor response, stability and good range of detection. (AU)

• Processo FAPESP: 17/18649-4 - 2017 MRS Fall Meeting and Exhibit
• Beneficiário: Waldir Avansi Junior
• Modalidade de apoio: Auxílio à Pesquisa - Reunião - Exterior
• Processo FAPESP: 18/18208-0 - Heteroestruturas a-Fe2O3/g-C3N4: Preparação, Caracterização e Aplicação como Sensores Resistivos de Gás
• Beneficiário: Ariadne Cristina Catto
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/12437-5 - Preparação e caracterização de nanoheterojunções semicondutoras aplicadas como sensores resistivos de gás fotoativados
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• Processo FAPESP: 13/17639-4 - Obtenção de semicondutores nanoestruturados: correlação das propriedades fotocatalíticas com suas características estruturais
• Beneficiário: Waldir Avansi Junior
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
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• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs