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http://hdl.handle.net/1843/57660| Type: | Artigo de Periódico |
| Title: | Preparation of titania-reduced graphene oxide composite coatings with electro- and photosensitive properties |
| Authors: | Lucas Márlon Castro Silva Bruno de Souza Gonçalves Jorgimara de Oliveira Braga Tarcizo da Cruz Costa de Souza Vinícius Gomide de Castro Glaura Goulart Silva Glenda Ribeiro de Barros Silveira Lacerda Tulio Matencio Tiago Campolina Barbosa Carlos Martins Viana Manuel Noel Paul Georges Houmard Eduardo Henrique Martins Nunes |
| Abstract: | Smooth 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. |
| Subject: | Nanotecnologia Dióxido de titânio Radiação ultravioleta Calcinação (Metalurgia) Propriedades elétricas Raios X — Difração Raman, Espectroscopia de Microscopia eletrônica de varredura Espectroscopia de ultravioleta Espectroscopia visível |
| language: | eng |
| metadata.dc.publisher.country: | Brasil |
| Publisher: | Universidade Federal de Minas Gerais |
| Publisher Initials: | UFMG |
| metadata.dc.publisher.department: | ENG - DEPARTAMENTO DE ENGENHARIA METALÚRGICA ENG - DEPARTAMENTO DE ENGENHARIA QUÍMICA ICX - DEPARTAMENTO DE QUÍMICA |
| Rights: | Acesso Aberto |
| metadata.dc.identifier.doi: | https://doi.org/10.1016/j.apsusc.2020.148029 |
| URI: | http://hdl.handle.net/1843/57660 |
| Issue Date: | 2021 |
| metadata.dc.url.externa: | https://www.sciencedirect.com/science/article/pii/S0169433220327860 |
| metadata.dc.relation.ispartof: | Applied Surface Science |
| Appears in Collections: | Artigo de Periódico |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| Preparation of titania-reduced graphene oxide composite coatings with electro- and photosensitive properties.pdf | 6.22 MB | Adobe PDF | View/Open |
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