BENTO, RODRIGO T.ABE, IGOR Y.CORREA, OLANDIR V.PILLIS, MARINA F.2024-02-082024-02-08BENTO, 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. <b>Abstract...</b> São Carlos, SP: Aptor Software, 2023. p. 707-707. Disponível em: http://repositorio.ipen.br/handle/123456789/34560.http://repositorio.ipen.br/handle/123456789/34560Photocatalytic 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.707-707openAccessResumo de eventos científicos0000-0002-1423-871X0000-0002-1797-9652https://orcid.org/0000-0002-1423-871X