Preparation of titania-reduced graphene oxide composite coatings with electro- and photosensitive properties

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dc.creatorLucas Márlon Castro Silva
dc.creatorBruno de Souza Gonçalves
dc.creatorJorgimara de Oliveira Braga
dc.creatorTarcizo da Cruz Costa de Souza
dc.creatorVinícius Gomide de Castro
dc.creatorGlaura Goulart Silva
dc.creatorGlenda Ribeiro de Barros Silveira Lacerda
dc.creatorTulio Matencio
dc.creatorTiago Campolina Barbosa
dc.creatorCarlos Martins Viana
dc.creatorManuel Noel Paul Georges Houmard
dc.creatorEduardo Henrique Martins Nunes
dc.date.accessioned2023-08-09T19:31:52Z
dc.date.accessioned2025-09-08T23:28:02Z
dc.date.available2023-08-09T19:31:52Z
dc.date.issued2021
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.format.mimetypepdf
dc.identifier.doihttps://doi.org/10.1016/j.apsusc.2020.148029
dc.identifier.issn1873-5584
dc.identifier.urihttps://hdl.handle.net/1843/57660
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofApplied Surface Science
dc.rightsAcesso Aberto
dc.subjectNanotecnologia
dc.subjectDióxido de titânio
dc.subjectRadiação ultravioleta
dc.subjectCalcinação (Metalurgia)
dc.subjectPropriedades elétricas
dc.subjectRaios X — Difração
dc.subjectRaman, Espectroscopia de
dc.subjectMicroscopia eletrônica de varredura
dc.subjectEspectroscopia de ultravioleta
dc.subjectEspectroscopia visível
dc.subject.otherTitania
dc.subject.otherGraphene oxide
dc.subject.otherWettability
dc.subject.otherUV illumination
dc.subject.otherCalcination
dc.subject.otherElectrical properties
dc.titlePreparation of titania-reduced graphene oxide composite coatings with electro- and photosensitive properties
dc.typeArtigo de periódico
local.citation.volume538
local.description.resumoSmooth and optically transparent titania (TiO2) and TiO2-reduced graphene oxide (RGO) composite films were successfully prepared here. A nanocrystalline anatase suspension was initially prepared by combining the sol-gel process and hydrothermal treatment. Graphene oxide (GO) nanosheets were prepared following a route similar to the Hummers method. Glass slides were then dip-coated using mixtures of TiO2 and GO suspensions. The concentration of GO in the prepared coatings ranged from 1 to 5 wt%. The coated samples were air-dried, and then either calcined or irradiated with UVA light. It was observed that UVA light promoted the reduction of GO to RGO, which increased both the electrical conductivity and hydrophilicity of the composites. The heat treatment of as-prepared coatings also decreased the water contact angle (WCA) with its surface, which is related to the removal of organics residues, graphene burning, and the increase in surface energy. The superhydrophilicity of the prepared samples was investigated after keeping them in air for up to 60 days, followed by UVA illumination. It was also demonstrated that a hydrophilic behavior can be induced in the samples prepared here by applying a direct current (DC) voltage, which could allow their use as smart materials in several applications.
local.identifier.orcidhttps://orcid.org/0009-0002-2962-897X
local.identifier.orcidhttps://orcid.org/0000-0001-6437-0009
local.identifier.orcidhttps://orcid.org/0000-0002-0308-0179
local.identifier.orcidhttps://orcid.org/0000-0002-8460-4893
local.identifier.orcidhttps://orcid.org/0000-0002-5660-8125
local.identifier.orcidhttps://orcid.org/0000-0001-6303-4222
local.identifier.orcidhttps://orcid.org/0000-0002-1543-5416
local.identifier.orcidhttps://orcid.org/0000-0001-6653-5137
local.publisher.countryBrasil
local.publisher.departmentENG - DEPARTAMENTO DE ENGENHARIA METALÚRGICA
local.publisher.departmentENG - DEPARTAMENTO DE ENGENHARIA QUÍMICA
local.publisher.departmentICX - DEPARTAMENTO DE QUÍMICA
local.publisher.initialsUFMG
local.url.externahttps://www.sciencedirect.com/science/article/pii/S0169433220327860

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