Nanocrystalline ZnO quantum dot-based chemiresistive gas sensors: Improving sensing performance towards NO2 and H2S by optimizing operating temperature

IF 6.5 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Sensors and Actuators Reports Pub Date : 2023-06-03 DOI:10.1016/j.snr.2023.100166

Dung Thi Hanh To , Ji Young Park , Bingxin Yang , Nosang V. Myung , Yong-Ho Choa

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引用次数: 2

Abstract

Nanocrystalline ZnO quantum dots (QD) with a diameter of 10 nm was synthesized and tested toward eight different toxic industrial chemicals (i.e., nitrogen dioxide (NO₂), hydrogen sulfide (H₂S), ammonia (NH₃), carbon monoxide (CO), methane (CH₄), ethanol (C₂H₅OH), acetone (CH₃)₂CO, and toluene (C₆H₅CH₃)) with a broad concentration range at five different operating temperatures. Systemic studies allow to determine the kinetics of gas sensing as well as the competing reactions of analytes with sensing material and adsorbed oxygen. ZnO QD showed an excellent sensing performance toward NO₂ and H₂S in comparison to other target analytes. The selectivity can be further improved by controlling the operating temperature (i.e., higher selectivity toward NO₂ and H₂S were achieved at 300 °C and 450 °C, respectively). Moreover, the optimal temperature was found to be analyte dependent.

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基于纳米晶ZnO量子点的化学电阻气体传感器:通过优化工作温度提高对NO2和H2S的传感性能

合成了直径为10 nm的纳米晶ZnO量子点(QD)，并在5种不同的工作温度下对8种不同浓度范围的有毒工业化学品(二氧化氮(NO2)、硫化氢(H2S)、氨(NH3)、一氧化碳(CO)、甲烷(CH4)、乙醇(C2H5OH)、丙酮(CH3)2CO和甲苯(C6H5CH3))进行了测试。系统研究可以确定气敏动力学以及分析物与传感材料和吸附氧的竞争反应。与其他目标分析物相比，ZnO QD对NO2和H2S具有优异的传感性能。通过控制操作温度可以进一步提高选择性(即在300℃和450℃时，对NO2和H2S的选择性分别较高)。此外，发现最佳温度与分析物相关。

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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.