Abstract
Methanol is one of the characteristic gases that distinguish between healthy individuals and lung cancer (LC) lesions in exhaled human breath. Its concentration in exhaled breath is generally below one part per million (1×10−6). The second-phase composite is widely regarded as one of the methods to improve the gas-sensing performance of metal oxide semiconductor (MOS) materials. In this study, LaF3–Co3O4 was synthesized by a simple hydrothermal method to enhance its low-concentration methanol gas-sensing performance. 5 at% LaF3–Co3O4 nanorods exhibited excellent methanol detection performance, including a wider linear detection concentration range (0.2×10−6–5×10−6), a response value exceeding 4.0 for 1×10−6 methanol at 275 °C and 75% relative humidity (RH), long-term stability (maximum deviation within 15% over 2 weeks), and excellent selectivity. The mechanism of performance enhancement was studied using various techniques, and density functional theory. The special spinel structure of Co3O4, the high ionic migration of F− in LaF3, the larger specific surface area of 5 at% LaF3–Co3O4 nanorods, and the generated crystal defects all explain the excellent methanol gas-sensing property. This work provides a novel route to prepare MOS composite materials for low-concentration methanol gas detection.
Graphical abstract
摘要
甲醇是人体呼出气中区分健康个体和肺癌患者的特征气体之一。其在呼出气体中的浓度通常低于ppm。第二相复合材料被广泛认为是提高金属氧化物半导体(MOS)材料气敏性能的方法之一。本研究采用简单水热法合成了LaF3–Co3O4, 以提高其低浓度甲醇气敏性能。5 at% LaF3–Co3O4纳米棒表现出优异的甲醇检测性能, 包括较宽的线性检测浓度范围(0.2–5 ppm), 在275℃和75%相对湿度下, 对1 ppm甲醇的响应值超过4.0, 长期稳定性(2周内最大偏差在15%以内), 以及出色的选择性。利用各种技术和密度泛函理论研究了性能增强的机理。Co3O4特殊的尖晶石结构、LaF3中F−的高离子迁移、5 at% LaF3–Co3O4纳米棒的大比表面积以及产生的晶体缺陷都解释了其优异的甲醇气敏性能。本工作为制备用于低浓度甲醇气体检测的MOS复合材料提供了一条新方法。
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This work was financially supported by the Outstanding Youth Foundation of Jiangsu Province of China (No. BK20211548) and Yangzhou City-Yangzhou University Cooperation Foundation (No. YZ2021153).
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He, XX., Chai, HF., Zhou, YW. et al. Sensing properties and mechanisms of LaF3–Co3O4 nanorods for low-concentration methanol detection. Rare Met. 43, 2193–2204 (2024). https://doi.org/10.1007/s12598-023-02593-6
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DOI: https://doi.org/10.1007/s12598-023-02593-6