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In 2 O 3  nanoparticle (NP)-decorated WO 3  nanorods (NRs) were prepared using sol–gel and hydrothermal methods. The In 2 O 3  NRs and WO 3  NPs were crystalline. WO 3  NP-decorated In 2 O 3  NRs were also prepared using thermal evaporation and hydrothermal methods. The NO 2  sensing performance of the In 2 O 3  NP-decorated WO 3  NR sensor toward NO 2  was compared to that of the WO 3  NP-decorated In 2 O 3  NR sensor. The former showed a high response to NO 2  due to a significant reduction of the conduction channel width upon exposure to NO 2 . In contrast, the latter showed a far less pronounced response due to limited reduction of the conduction channel width upon exposure to NO 2 . When the sensors were exposed to a reducing gas instead of an oxidizing gas (NO 2 ), the situation was reversed, i.e., the WO 3  NP-decorated In 2 O 3  NR exhibited a stronger response to the reducing gas than the In 2 O 3  NP-decorated WO 3  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 In 2 O 3  NP-decorated WO 3  NR sensor showed higher selectivity for NO 2  compared to other gases, including reducing gases and other oxidizing gases, as well as showed high sensitivity to NO 2 .

NO2 sensing properties of WO3-decorated In2O3 nanorods and In2O3-decorated WO3 nanorods