Intrinsic defects generated by iodine during TiO2 crystallization and its relationship with electrical conductivity and photoactivity
Carregando...
Data
Data de publicação
Autores IPEN
Orientador
Título da Revista
ISSN da Revista
Título do Volume
É parte de
É parte de
É parte de
International Journal of Ceramic Engineering and Science
Exportar
Resumo
Defect formation during synthesis is one of the strategies used to improve the
photoactivity of polycrystalline semiconductors such as titanium dioxide (TiO2).
Defects can modify the electronic structure of TiO2 and change the surface
of the interaction between the photocatalyst and the reactants. In this study,
TiO2 relationship between processing in the presence of iodine and the consequent formation of intrinsic defects were explored. TiO2 nanoparticles were
synthesized using the polymeric precursor method and exposed to iodine ions at
concentrations up to 5 mol%. After calcination at 350◦C, detailed chemical analyses revealed that iodine was absent in the samples. However, the TiO2 properties,
such as specific surface area, crystallite sizes, and specific grain boundary area,
were affected. Further experiments, such as electron paramagnetic resonance,
diffuse reflectance, optical measurements, and electrochemical impedance spectroscopy indicated the presence of defects in the iodine-processed samples.
These defects directly influenced the electrical properties of the material, which
affected the photoactivity, measured by the degradation of acetaminophen.
Como referenciar
BERNARDES, ANDRE A.; SILVA, ANDRE L. de; RAMOS, BRUNO; FONSECA, FABIO C.; GOUVEA, DOUGLAS. Intrinsic defects generated by iodine during TiO2 crystallization and its relationship with electrical conductivity and photoactivity. International Journal of Ceramic Engineering and Science, v. 5, n. 5, p. 1-11, 2023. DOI: 10.1002/ces2.10186. Disponível em: http://repositorio.ipen.br/handle/123456789/34243. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.