A high selectivity and low detection limit carbon monoxide sensor based on Au-GO/Co-ZnO composite material.

IF 9.9 1区工程技术 Q1 INSTRUMENTS & INSTRUMENTATION

Microsystems & Nanoengineering Pub Date : 2025-09-29 DOI:10.1038/s41378-025-00981-9

Tianye Zhou, Tingting Chen, Zhimei Qi, Jianhai Sun, Zhiyuan Niu, Xuehui Li, Tianjun Ma, Xiangqian Kong, Liang Zhao, Junyi Lin, Bofeng Luo, Zhengkai Li

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Abstract

Metal oxide semiconductor gas sensors offer high sensitivity and low-cost gas detection. However, low selectivity and poor stability are significant challenges associated with these sensors. In this study, we designed a sheet-like stacked zinc oxide (ZnO) nanomaterial using ZIF-67 and prepared the nanomaterial AGCZ-2 by doping with gold-modified graphene oxide (GO). This material demonstrates rapid and sensitive detection of low concentrations of carbon monoxide (CO) gas and exhibits excellent selectivity towards CO. The crystal structure, microstructure, elemental composition, and pore size of the material were characterized and analyzed using XRD, FESEM, EDS elemental analysis, TEM, and N₂ adsorption-desorption techniques. The CO gas sensing performance of the sensor prepared in this study was tested, and the results showed that the AGCZ-2 sensor, operating at an optimal temperature of 260 °C, had a response value of 5.84 for 50 ppm CO, with response and recovery times of 103 s and 84 s, respectively. In terms of selectivity, the response of the AGCZ-2 sensor to CO was 3.84 times that of the second most sensitive gas (hydrogen), indicating excellent selectivity towards CO over hydrogen. Additionally, the sensor exhibited good stability and repeatability, with a relative standard deviation of 2.27% for the response values to 5 ppm CO gas over five consecutive tests. Over a 28-day testing period, the sensor's response to 5 ppm CO exhibited a decay rate of 5.22%, with a relative standard deviation of 2.41.

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基于Au-GO/Co-ZnO复合材料的高选择性低检测限一氧化碳传感器。

金属氧化物半导体气体传感器提供高灵敏度和低成本的气体检测。然而，低选择性和较差的稳定性是与这些传感器相关的重大挑战。在本研究中，我们使用ZIF-67设计了一种片状堆叠氧化锌（ZnO）纳米材料，并通过掺杂金修饰的氧化石墨烯（GO）制备了纳米材料AGCZ-2。采用XRD、FESEM、EDS元素分析、TEM和N2吸附-脱附技术对材料的晶体结构、微观结构、元素组成和孔径进行了表征和分析。对所制备的传感器的CO气体传感性能进行了测试，结果表明，AGCZ-2传感器在260℃的最佳工作温度下，对50 ppm CO的响应值为5.84，响应时间和恢复时间分别为103 s和84 s。在选择性方面，AGCZ-2传感器对CO的响应是第二敏感气体（氢气）的3.84倍，表明对CO的选择性优于氢气。此外，该传感器具有良好的稳定性和可重复性，在连续五次测试中，对5 ppm CO气体的响应值的相对标准偏差为2.27%。在28天的测试期内，传感器对5 ppm CO的响应衰减率为5.22%，相对标准偏差为2.41。

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来源期刊

Microsystems & Nanoengineering Materials Science-Materials Science (miscellaneous)

CiteScore

12.00

自引率

3.80%

发文量

123

审稿时长

20 weeks

期刊介绍： Microsystems & Nanoengineering is a comprehensive online journal that focuses on the field of Micro and Nano Electro Mechanical Systems (MEMS and NEMS). It provides a platform for researchers to share their original research findings and review articles in this area. The journal covers a wide range of topics, from fundamental research to practical applications. Published by Springer Nature, in collaboration with the Aerospace Information Research Institute, Chinese Academy of Sciences, and with the support of the State Key Laboratory of Transducer Technology, it is an esteemed publication in the field. As an open access journal, it offers free access to its content, allowing readers from around the world to benefit from the latest developments in MEMS and NEMS.