Abstract The present work reports on a novel resistive ppm level ethanol sensor, prepared from nanocrystalline lanthanum loaded indium tin oxide (ITO) impregnated with palladium and antimony additives. A simple unique gel calcination process was adapted to synthesize the nanocomposite powders from their water based precursor salts. This was followed by detailed material characterizations through X-ray diffractometer, FESEM, TEM, EDX and XPS analyses. Fabricated Taguchi type sensor with an optimum concentration of Pd exhibited an excellent sensing performance towards a wide concentration range of (1–100 ppm) ethanol vapour. The sensor showed ~87% sensing response for 10 ppm ethanol vapour at an operating temperature of 300 °C. Even at 1 ppm concentration, ~53% response was observed with fast response and recovery time. The sensing action has been elucidated as the catalytic oxidation of ethanol to carbon di oxide over the La loaded ITO surface layer that resulted in electron transfer to the indium tin oxide site. In addition, synergistic effect of palladium and antimony enhanced the sensing performance as well as reduced the base resistance of the sensor by chemical/electronic sensitization and increasing carrier ion concentration respectively. Comparatively low resistance, negligible cross sensitivity, quick response/recovery time and good long term stability makes the sensor suitable for deployment in practical applications.

中文翻译：

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基于 Pd 和 Sb 添加剂浸渍的负载 La 的 ITO 的新型 ppm 级乙醇传感器

摘要 目前的工作报告了一种新型电阻式 ppm 级乙醇传感器，该传感器由负载有钯和锑添加剂的纳米晶镧负载氧化铟锡 (ITO) 制成。一种简单的独特凝胶煅烧工艺适用于从纳米复合粉末的水基前体盐合成。然后通过 X 射线衍射仪、FESEM、TEM、EDX 和 XPS 分析对材料进行详细表征。具有最佳 Pd 浓度的制造田口型传感器对宽浓度范围（1-100 ppm）的乙醇蒸汽表现出优异的传感性能。该传感器在 300 °C 的工作温度下对 10 ppm 乙醇蒸汽显示出约 87% 的感应响应。即使在 1 ppm 浓度下，也观察到了约 53% 的响应，响应速度快且恢复时间快。传感作用已被阐明为乙醇在负载 La 的 ITO 表面层上催化氧化为二氧化碳，导致电子转移到氧化铟锡位点。此外，钯和锑的协同作用增强了传感性能，并分别通过化学/电子敏化和增加载流子离子浓度降低了传感器的基极电阻。相对较低的电阻、可忽略的交叉灵敏度、快速的响应/恢复时间和良好的长期稳定性使传感器适合部署在实际应用中。钯和锑的协同作用分别通过化学/电子敏化和增加载流子离子浓度增强了传感性能并降低了传感器的基极电阻。相对较低的电阻、可忽略的交叉灵敏度、快速的响应/恢复时间和良好的长期稳定性使传感器适合部署在实际应用中。钯和锑的协同作用分别通过化学/电子敏化和增加载流子离子浓度增强了传感性能并降低了传感器的基极电阻。相对较低的电阻、可忽略的交叉灵敏度、快速的响应/恢复时间和良好的长期稳定性使传感器适合部署在实际应用中。