In2O3 nanoparticle (NP)-decorated WO3 nanorods (NRs) were prepared using sol–gel and hydrothermal methods. The In2O3 NRs and WO3 NPs were crystalline. WO3 NP-decorated In2O3 NRs were also prepared using thermal evaporation and hydrothermal methods. The NO2 sensing performance of the In2O3 NP-decorated WO3 NR sensor toward NO2 was compared to that of the WO3 NP-decorated In2O3 NR sensor. The former showed a high response to NO2 due to a significant reduction of the conduction channel width upon exposure to NO2. In contrast, the latter showed a far less pronounced response due to limited reduction of the conduction channel width upon exposure to NO2. When the sensors were exposed to a reducing gas instead of an oxidizing gas (NO2), the situation was reversed, i.e., the WO3 NP-decorated In2O3 NR exhibited a stronger response to the reducing gas than the In2O3 NP-decorated WO3 NR sensor. Thus, a semiconducting metal oxide (SMO) with a smaller work function must be used as the decorating material in decorated heterostructured SMO sensors for detection of oxidizing gases. The In2O3 NP-decorated WO3 NR sensor showed higher selectivity for NO2 compared to other gases, including reducing gases and other oxidizing gases, as well as showed high sensitivity to NO2.

中文翻译：

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用WO ₃装饰的In ₂ O ₃纳米棒和用In ₂ O ₃装饰的WO ₃纳米棒的NO ₂感测特性

使用溶胶-凝胶法和水热法制备了In2O3纳米颗粒（NP）装饰的WO3纳米棒（NRs）。In2O3 NR和WO3 NP是结晶的。还使用热蒸发和水热方法制备了WO3 NP修饰的In2O3 NR。将装饰有In2O3 NP的WO3 NR传感器对NO2的NO2感应性能与装饰有WO3 NP的In2O3 NR传感器的NO2感应性能进行了比较。前者显示出对NO2的高响应性，这是因为暴露于NO2后传导通道宽度显着减小。相反，由于暴露于NO 2时传导通道宽度的有限减小，后者显示出远不那么明显的响应。当传感器暴露于还原性气体而不是氧化性气体（NO2）时，情况就相反了，即 WO3 NP修饰的In2O3 NR比In2O3 NP修饰的WO3 NR传感器对还原气体的响应更强。因此，必须使用具有较小功函数的半导体金属氧化物（SMO）作为装饰异质结构SMO传感器中的装饰材料，以检测氧化性气体。与其他气体（包括还原气体和其他氧化性气体）相比，In2O3 NP装饰的WO3 NR传感器对NO2的选择性更高。