Amplifying the receptor function on Ba0.9La0.1FeO3-SnO2 composite particle surface for high sensitivity toward ethanol gas sensing
Amplifying the receptor function on Ba0.9La0.1FeO3-SnO2 composite particle surface for high sensitivity toward ethanol gas sensing
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DOI：
10.1016/j.snb.2021.131256
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发表时间：
2022-03
期刊：
影响因子：
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通讯作者：
K. Suematsu;Yuki Hiroyama;Ken Watanabe;K. Shimanoe
中科院分区：
文献类型：
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作者：
K. Suematsu;Yuki Hiroyama;Ken Watanabe;K. Shimanoe
设计了Ba0.9La0.1FeO_3(BLF)和SnO_2复合粒子，以放大半导体气体传感器的感受器功能，实现对挥发性有机化合物气体的高灵敏度。在工作期间，传感器在包括高温预热的双脉冲模式(DP模式)下驱动。程序升温脱附测试表明，BLF-SnO2复合材料的脱附温度低于SnO2，脱附量也较大。在DP模式下，BLF-SnO2的电阻显著高于SnO2，这是因为BLF作为氧供应者增加了敏感层中的有效氧浓度。此外，程序升温反应测量表明，乙醇从BLF中脱附，乙醇在BLF-SnO2上的脱附和燃烧总量大于在SnO2上。因此，在DP模式下使用BLF-SnO2可以提高传感器对乙醇燃烧反应的响应，特别是在400℃的预热温度和250℃的测量温度下，传感器对1ppm乙醇的响应分别为143。这种增强的反应归因于氧气和乙醇在DP模式下的缩合，而BLF扮演着氧气和乙醇提供者的角色。因此，将BLF与SnO2复合可以显著增强敏感材料的受体功能，这样的材料设计可以提高灵敏度。
Composite particles of Ba0.9La0.1FeO3(BLF) and SnO2have been designed to amplify the receptor function of semiconductor gas sensor and achieve high sensitivity toward volatile organic compound gases. During operation, the sensor was driven under double-pulse mode (DP-mode) that includes high-temperature preheating. According to the temperature programmed desorption measurement, oxygen desorption from the BLF-SnO2composite occurred at lower temperatures than that from SnO2, and the amount of oxygen desorption was also larger. Under the DP-mode, the electrical resistance of BLF-SnO2was significantly higher than that of SnO2, because BLF acted as an oxygen supplier to increase effective oxygen concentration in the sensing layer. In addition, temperature programmed reaction measurement revealed that ethanol desorbed from BLF, and that the total amount of ethanol desorption and combustion on BLF-SnO2was larger than that on SnO2. Thus, the sensor response to ethanol based on ethanol combustion reaction was enhanced when using BLF-SnO2under the DP-mode, especially the sensor response to 1 ppm ethanol showed 143 at the preheating and measurement temperatures of 400 °C and 250 °C, respectively. This enhanced response was attributed to the condensation of oxygen and ethanol under the DP-mode, with BLF playing the role of oxygen and ethanol provider. Thus, compositing BLF with SnO2significantly amplified the receptor function of the sensing material, and such materials design could lead to improved sensitivity.