The porous Pd-loaded In2O3 hollow spheres were successfully prepared by simple one-step method with the template of carbon spheres. The effect of calcination temperatures on morphology, composition and gas sensing performance of the as-obtained products was discussed by a series of test methods. The sample calcined at 550∘C showed uniform porous hollow spheres with an average diameter of 100[Formula: see text]nm. Gas-sensing results exhibited that the Pd-In2O3 hollow spheres-based sensor possessed excellent sensing properties to formaldehyde, which include high response value (33), low working temperature (180∘C) and fast response and recovery time (12[Formula: see text]s and 22[Formula: see text]s). The enhanced HCHO-sensing properties of Pd-In2O3 composites were attributed to the special porous and hollow structure, abundant oxygen vacancies and the catalysis of palladium. Pd-loaded In2O3 hollow spheres had been proved to be an ideal material for detecting HCHO at a low working temperature.

中文翻译：

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具有增强低温甲醛传感的 Pd 负载 In2O3 空心球

多孔 Pd 负载 In2○3以碳球为模板，通过简单的一步法成功制备空心球。通过一系列测试方法讨论了煅烧温度对所得产品的形貌、组成和气敏性能的影响。样品在 550 下煅烧∘C显示平均直径为100[公式：见正文]nm的均匀多孔空心球。气敏结果表明，Pd-In2○3基于空心球的传感器对甲醛具有优异的传感性能，包括高响应值（33），低工作温度（180∘C) 和快速的响应和恢复时间（12[公式：见文本]s 和 22[公式：见文本]s）。Pd-In 增强的 HCHO 传感特性2○3复合材料归因于特殊的多孔和中空结构、丰富的氧空位和钯的催化作用。载钯2○3空心球已被证明是在低工作温度下检测 HCHO 的理想材料。