用于室温下 VOC 检测的层状双氢氧化物气体传感器,ACS Omega

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用于室温下 VOC 检测的层状双氢氧化物气体传感器
ACS Omega ( IF 3.7 ) Pub Date : 2021-07-29 , DOI: 10.1021/acsomega.1c02038
Lorenzo Vigna ₁ , Arianna Nigro ₁ , Alessio Verna ₁ , Ivan Vito Ferrari ₂ , Simone Luigi Marasso _{1,

3} , Sergio Bocchini ₂ , Marco Fontana ₂ , Angelica Chiodoni ₂ , Candido Fabrizio Pirri _{1,

2} , Matteo Cocuzza _{1,

3}

Affiliation

用于挥发性有机化合物 (VOC) 的小型化低成本传感器有潜力成为室内外空气质量监测的基本工具，从而显着改善日常生活。层状双氢氧化物（LDH）属于阴离子粘土类，主要用于NO _x检测，而关于VOC 的结果报道很少。在这项工作中，提出了一种新的 LDH 共沉淀方法。首次对四种 LDH（ZnAl-Cl、ZnFe-Cl、ZnAl-NO ₃和 MgAl-NO ₃）进行比较，以研究其传感性能。通过多次显微镜和光谱分析进行探索，LDH 显示出一种形态，其特征是大表面积和三维分层花状结构，具有微米和纳米孔，可诱导目标气体的快速扩散和高效的表面相互作用。所制造的传感器在室温下运行，能够可逆地选择性检测丙酮、乙醇、氨和氯蒸气，在 21°C 时达到高达 6% 的显着传感响应值。结果表明，通过改变LDH的组成，可以调节传感器的灵敏度和选择性，有助于区分不同的分析物，随后在传感器阵列上的集成为电子鼻的发展铺平了道路。

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Layered Double Hydroxide-Based Gas Sensors for VOC Detection at Room Temperature

Miniaturized low-cost sensors for volatile organic compounds (VOCs) have the potentiality to become a fundamental tool for indoor and outdoor air quality monitoring, to significantly improve everyday life. Layered double hydroxides (LDHs) belong to the class of anionic clays and are largely employed for NO_x detection, while few results are reported on VOCs. In this work, a novel LDH coprecipitation method is proposed. For the first time, a study comparing four LDHs (ZnAl–Cl, ZnFe–Cl, ZnAl–NO₃, and MgAl–NO₃) is carried out to investigate the sensing performances. As explored through several microscopy and spectroscopy analyses, LDHs show a morphology characterized by a large surface area and a three-dimensional hierarchical flowerlike architecture with micro- and nanopores that induce a fast diffusion and highly effective surface interaction of the target gases. The fabricated sensors, operating at room temperature, are able to reversibly and selectively detect acetone, ethanol, ammonia, and chlorine vapors, reaching significant sensing response values up to 6% at 21 °C. The results demonstrate that by changing the LDHs’ composition, it is possible to modulate the sensitivity and selectivity of the sensor, helping the discrimination of different analytes, and the consequent integration on a sensor array paves the way for electronic nose development.

更新日期：2021-08-10

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