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

IF 6.5 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Sensors and Actuators Reports Pub Date : 2022-11-01 DOI:10.1016/j.snr.2022.100081

João V.N. de Palma , Ariadne C. Catto , Marisa C. de Oliveira , Renan A.P. Ribeiro , Marcio D. Teodoro , Luís F. da Silva

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引用次数: 2

Abstract

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.

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SnO2纳米粒子光辅助臭氧气敏性能:实验和理论见解

本文报道了在发光二极管的辅助下，SnO2纳米颗粒在室温下的臭氧气敏性能。x射线衍射和高分辨率透射电镜分析表明，热处理后的SnO2颗粒具有纳米晶化特征。此外，光学测量表明，纳米颗粒的光学间隙约为3.8 eV，在625 nm左右有宽的光致发光，XPS分析表明，这与氧空位的存在有关。关于光辅助气敏测量，电分析显示臭氧传感性能明显依赖于所选光源的波长，在紫外线区域激发时达到最高的臭氧响应。理论计算表明，(110)表面存在的[SnO6]和[SnO5]团簇能够诱导电子-空穴解离，为O3相互作用提供可靠的化学环境，从而提高了光生载流子的稳定性，并有助于增强紫外激发下的气敏特性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Sensors and Actuators Reports Multiple-

CiteScore

9.60

自引率

0.00%

发文量

审稿时长

49 days

期刊介绍： Sensors and Actuators Reports is a peer-reviewed open access journal launched out from the Sensors and Actuators journal family. Sensors and Actuators Reports is dedicated to publishing new and original works in the field of all type of sensors and actuators, including bio-, chemical-, physical-, and nano- sensors and actuators, which demonstrates significant progress beyond the current state of the art. The journal regularly publishes original research papers, reviews, and short communications. For research papers and short communications, the journal aims to publish the new and original work supported by experimental results and as such purely theoretical works are not accepted.

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