Enhanced acetone gas sensor based on ZnCo2O4/rGO/Ag composite: Morphology and concentration effects

IF 3.9 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B Pub Date : 2025-07-14 DOI:10.1016/j.mseb.2025.118587

M. Ebrahimifar , I. Kazeminezhad

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Abstract

In the present work, ZnCo₂O₄/rGO/Ag nanocomposite was synthesized and structurally studied by XRD and FESEM techniques. Then the nanocomposite was used as the main part of a gas sensor. Considering the importance of morphology in gas sensing, two different morphologies of ZnCo₂O₄, microrods (ZCO-R) and microspheres (ZCO-S) were synthesized in pure and composited with rGO forms and used in acetone gas sensing. After obtaining relatively good response of 15.2 at 200 °C temperature for ZCO-S/rGO_0.50mg/ml composite, in order to improve the sensing performance, this composite was decorated with different weight percentages of Ag nanoparticles. The sensor made of ZCO-S/rGO_0.50mg/ml/Ag_4% decorated nanocomposite showed a significant increase in response as 38.5 at a temperature of 160 °C the best sensing performance with a response of at low working temperature compared to other sensors. This result indicates the synergistic effect of Ag and rGO on ZCO-S in enhancing the performance of ZCO-S/rGO/Ag decorated nanocomposite gas sensor. The sensor made of this composite showed very good response time of 14 s, recovery time of 40 s, and stability in the long-term period. The results also showed that this composite has relatively good selectivity to acetone gas compared to other gases such as ethanol, benzene, methanol, isopropane and toluene.

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基于ZnCo2O4/rGO/Ag复合材料的增强型丙酮气体传感器：形貌及浓度效应

本文合成了ZnCo2O4/rGO/Ag纳米复合材料，并用XRD和FESEM技术对其结构进行了研究。然后将该纳米复合材料用作气体传感器的主体部分。考虑到形貌在气敏中的重要性，以纯ZnCo2O4为材料，合成了微棒（ZCO-R）和微球（ZCO-S）两种不同形态的ZnCo2O4，并与还原氧化石墨烯（rGO）形式复合，用于丙酮气敏。ZCO-S/rGO0.50mg/ml复合材料在200℃温度下获得了相对较好的15.2的响应后，为了提高该复合材料的传感性能，采用不同重量百分比的Ag纳米粒子修饰该复合材料。ZCO-S/rGO0.50mg/ml/Ag4%修饰纳米复合材料制成的传感器在160°C温度下的响应率显著提高，达到38.5，与其他传感器相比，在低工作温度下的响应率最高。结果表明，Ag和rGO对ZCO-S具有协同作用，可以提高ZCO-S/rGO/Ag修饰的纳米复合气体传感器的性能。该复合材料制成的传感器具有良好的响应时间为14 s，恢复时间为40 s，且长期稳定。结果还表明，与乙醇、苯、甲醇、异丙烷和甲苯等气体相比，该复合材料对丙酮气体具有较好的选择性。

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

Materials Science and Engineering: B 工程技术-材料科学：综合

CiteScore

5.60

自引率

2.80%

发文量

481

审稿时长

3.5 months

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.