High-sensitive NO2 sensor based on p-NiCo2O4/n-WO3 heterojunctions

IF 8 1区化学 Q1 CHEMISTRY, ANALYTICAL

Sensors and Actuators B: Chemical Pub Date : 2022-02-01 DOI:10.1016/j.snb.2021.130912

Yaqing Hu, Tingting Li, Jianhua Zhang, Jingyu Guo, Weiwei Wang, Dongzhi Zhang

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引用次数: 45

Abstract

In this paper, a NO₂ gas sensor with outstanding sensing performance based on NiCo₂O₄/WO₃ nanocomposite was synthesized by a hydrothermal method. A variety of testing methods such as XRD, SEM, TEM and XPS were applied to characterize the microstructure, morphology and element compositions of the sensing material. The sensing properties of NiCo₂O₄/WO₃ composite films to NO₂ gas were studied at the optimal temperature of 150 ^oC. The test results of gas sensor showed that, compared with the pristine WO₃ sensor, the NiCo₂O₄/WO₃ composite film sensor had higher response (116.9@20 ppm), shorter response/recovery time (13 s/16 s@20 ppm), good linearity, stable repeatability and brilliant selectivity. The enhanced gas sensitivity of NiCo₂O₄/WO₃ nanocomposite films may be due to the synergistic effect of the unique microstructure of NiCo₂O₄/WO₃ and the p-n heterojunction formed between the two materials.

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基于p-NiCo2O4/n-WO3异质结的高灵敏度NO2传感器

本文采用水热法制备了一种基于NiCo2O4/WO3纳米复合材料的NO2气体传感器。采用XRD、SEM、TEM和XPS等多种测试方法对传感材料的微观结构、形貌和元素组成进行了表征。研究了NiCo2O4/WO3复合膜对NO2气体的传感性能，最佳温度为150℃。气体传感器的测试结果表明，与原始WO3传感器相比，NiCo2O4/WO3复合膜传感器具有更高的响应(116.9@20 ppm)、更短的响应/恢复时间(13 s/16 s@20 ppm)、良好的线性、稳定的重复性和出色的选择性。NiCo2O4/WO3纳米复合膜的气敏性增强可能是由于NiCo2O4/WO3独特的微观结构和两种材料之间形成的p-n异质结的协同作用。

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 B: Chemical 工程技术-电化学

CiteScore

14.60

自引率

11.90%

发文量

1776

审稿时长

3.2 months

期刊介绍： Sensors & Actuators, B: Chemical is an international journal focused on the research and development of chemical transducers. It covers chemical sensors and biosensors, chemical actuators, and analytical microsystems. The journal is interdisciplinary, aiming to publish original works showcasing substantial advancements beyond the current state of the art in these fields, with practical applicability to solving meaningful analytical problems. Review articles are accepted by invitation from an Editor of the journal.