Light-assisted ozone gas-sensing performance of SnO2 nanoparticles: Experimental and theoretical insights

Sensors and Actuators Reports

Marisa C. de Oliveira¹  Ariadne C. Catto¹  Marcio D. Teodoro²  Luís F. da Silva³  João V.N. de Palma³  Renan A.P. Ribeiro⁴ 

[1]Center for the Development of Functional Materials, Federal University of São Carlos, São Carlos, SP, Brazil

[2]Department of Physics, Federal University of São Carlos, 13565-090, São Carlos, SP, Brazil

[3]Laboratory of Nanostructured Multifunctional Materials, Federal University of São Carlos, São Carlos, SP, Brazil

[4]Laboratory of Theoretical Chemistry and Computational Modelling, Minas Gerais State University, Divinópolis, MG, Brazil

关键词: SnO2;    Nanoparticles;    Chemiresistor;    Light-assisted;    Ozone;    DFT calculations;   

DOI  :  

来源: DOAJ

【 摘 要 】

We report herein an investigation on the ozone gas-sensing performance at room temperature of SnO2 nanoparticles assisted by a light-emitting diode. X-ray diffraction and high-resolution transmission electron microscopy analyses indicated the nanocrystalline characteristics of the SnO2 particles after heat treatment. Besides, optical measurements pointed out that the nanoparticles presented an optical gap of approximately 3.8 eV with a broad photoluminescence emission at around 625 nm, which was linked to the presence of oxygen vacancies, suggested by XPS analysis. With regard to the light-assisted gas-sensing measurements, electrical analysis revealed a clear dependence of the ozone sensing performance on the wavelength of the source of illumination chosen, with the highest ozone response being reached upon excitation in the ultraviolet region. Theoretical calculations showed that the (110) surface could increase the stability of photogenerated carriers and contribute to enhancing the gas-sensing features under ultraviolet excitation due to the presence of [SnO6] and [SnO5] clusters, which are capable of inducing an electron-hole dissociation and a reliable chemical environment for O3 interaction.

【 授权许可】

Unknown