Produção e caracterização de filmes de MoO3 para aplicação fotocatalítica na região visível do espectro solar

Main Article Content

Paulo Victor Nogueira Costa
Carlos Luiz Ferreira
Roberto Ribeiro de Avillez
Leila Rosa de Oliveira Cruz

Abstract

Hydrogen production from photocatalytic water splitting is a clean and renewable alternative to replace fossil fuels and meet the global demand for energy. Currently. The objective of this work is to obtain thin films of MoO3 for dissociating water under visible light. The effect of the oxygen fraction in the gas mixture (O2/Ar+O2) on the crystalline phases was investigated. X-ray diffraction results showed that films with 5%O2 were mostly monoclinic, while films deposited with oxygen fractions above 20% were mostly orthorhombic. Transmittance analyzes showed a change in the fundamental absorption edge, from 400 nm to 750 nm, as the oxygen fraction decreased. The bandgap decreased from 3.20 eV to 1.51 eV, favoring visible light absorption. Atomic force microscopy images showed that the roughness and surface area increased as the oxygen fraction decreased. These results indicate that the fraction of oxygen can be used as a control parameter for the microstructural, optical and surface properties of the material.

Downloads

Download data is not yet available.

Article Details

How to Cite
Costa, P. V. N., Ferreira, C. L., de Avillez, R. R., & Cruz, L. R. de O. (2023). Produção e caracterização de filmes de MoO3 para aplicação fotocatalítica na região visível do espectro solar. Revista Militar De Ciência E Tecnologia, 39(3), 244-258. Retrieved from http://ebrevistas.eb.mil.br/CT/article/view/9223
Section
Ciência dos Materiais