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Effect of AgO loading on flame-made LaFeO3 p-type semiconductor nanoparticles to acetylene sensing
Sensors and Actuators B: Chemical ( IF 8.4 ) Pub Date : 2020-03-29 , DOI: 10.1016/j.snb.2020.127990
A. Sukee , A.A. Alharbi , A. Staerz , A. Wisitsoraat , C. Liewhiran , U. Weimar , N. Barsan

In this work, unloaded and Ag-loaded LaFeO3 gas sensors produced using flame spray pyrolysis (FSP) for the first time were investigated for acetylene gas-sensing applications. From the structural analyses using X-ray diffraction, electron microscopy, energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy that the formation of AgO nanoclusters on spherical LaFeO3 particles was identified. From gas-sensing measurements, the unloaded LaFeO3 sensor displayed high sensitivity and selectivity to low concentrations (< 500 ppm) of acetylene. The 0.1 wt% Ag-loaded LaFeO3 sensor gave the highest sensor signal (60) towards 100 ppm acetylene, which is almost 12 times higher than the pure material at an optimal working temperature of 200 °C. In addition, it exhibited low cross sensitivity to hydrogen, carbon monoxide, ethylene, methane and carbon dioxide. Higher Ag loading (1 wt%) resulted in low sensitivity and no selectivity to acetylene. Loading with Ag at the low content (0.1 wt%) also lowered the humidity dependence of the sensor response. Through a detailed analysis, the enhanced acetylene-sensing performance of Ag-loaded LaFeO3 could be attributed to a Fermi-level control mechanism. It was found that the FSP-made LaFeO3-based gas sensors are better than other materials for sensing low acetylene concentrations in practical applications such as the dissolved gas analysis of transformer oil.



中文翻译:

AgO负载量对火焰制备的LaFeO 3 p型半导体纳米粒子的乙炔传感影响

在这项工作中,首次研究了使用火焰喷雾热解法(FSP)生产的未加载和已加载Ag的LaFeO 3气体传感器,用于乙炔气体传感应用。通过使用X射线衍射,电子显微镜,能量色散X射线光谱和X射线光电子能谱的结构分析,可以确定在球形LaFeO 3颗粒上形成AgO纳米团簇。根据气体传感测量结果,未加载的LaFeO 3传感器对低浓度(<500 ppm)的乙炔显示出高灵敏度和选择性。含银量为0.1 wt%的LaFeO 3传感器向100 ppm乙炔提供最高的传感器信号(60),在最佳工作温度200°C时几乎比纯材料高12倍。此外,它对氢,一氧化碳,乙烯,甲烷和二氧化碳的交叉敏感性低。较高的银负载量(1 wt%)导致灵敏度低,对乙炔没有选择性。以低含量(0.1重量%)的Ag负载也降低了传感器响应的湿度依赖性。通过详细的分析,负载Ag的LaFeO 3的增强的乙炔传感性能可以归因于费米能级控制机制。发现由FSP制造的LaFeO 3的气体传感器在实际应用中(例如变压器油的溶解气体分析)比其他用于检测低乙炔浓度的材料要好。

更新日期:2020-03-30
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