Raman spectroscopy applied on the structural characterization of TiO2/expanded graphite films
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2023
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BRAZIL MRS MEETING, 21st
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Photocatalytic heterojunctions obtained from the use of titanium dioxide (TiO2) and carbon based
materials are a promising way for the efficient water treatment [1]. The structural
properties of the composite photocatalysts are an important characteristic that can
influence their photocatalytic behavior [2]. Here, TiO2/expanded graphite (TiO2-EG) films
were synthetized by sol-gel and deposited on borosilicate glass substrates by airbrush spray
coating method at room temperature. Then, the hybrid films were heat treated at 350, 450
and 550 °C. Raman spectroscopy technique was applied to evaluate the effect of carbon
amount and temperature on the structural properties of the films. The films heat treated at
350 °C exhibited a characteristic profile of amorphous material. Raman spectra of
composite films heat treated at 450 and 550 °C showed well-defined peaks that can be
attributed to anatase-TiO2phase. No peaks related to the rutile or other phases were
observed. The investigation revealed that the G and 2D bands present a slight shift, as well
as asymmetry, as the carbon content and heat treatment temperature increase – behavior
that may be associated with the formation of the semiconductor-C heterojunction. Peaks
deconvolution process demonstrated the presence of a second signal not found in the pure
films. This effect may indicate a reduction of sp2 domains after the formation of
semiconductor-C heterojunction, mainly due to the removal of oxygenated groups during
heat treatment, and consequent Ti-C / Ti-O-C bonds formation [3]. The results suggested
that the carbon amount and the temperature of heat treatment have great influence on the
TiO2 -EG structural properties, which may contribute to the improvement of the
photocatalytic activity of the composite films under visible light.
Como referenciar
BENTO, RODRIGO T.; ABE, IGOR Y.; CORREA, OLANDIR V.; PILLIS, MARINA F. Raman spectroscopy applied on the structural characterization of TiO2/expanded graphite films. In: BRAZIL MRS MEETING, 21st, October 1-5, 2023, Maceió, AL. Abstract... São Carlos, SP: Aptor Software, 2023. p. 707-707. Disponível em: http://repositorio.ipen.br/handle/123456789/34560. Acesso em: 11 May 2024.
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.