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TiO 2 -Ag 2 O composite nanorods with various Ag 2 O configurations were synthesized by a two-step process, in which the core TiO 2 nanorods were prepared by the hydrothermal method and subsequently the Ag 2 O crystals were deposited by sputtering deposition. Two types of the TiO 2 -Ag 2 O composite nanorods were fabricated; specifically, discrete Ag 2 O particle-decorated TiO 2 composite nanorods and layered Ag 2 O-encapsulated TiO 2 core-shell nanorods were designed by controlling the sputtering duration of the Ag 2 O. The structural analysis revealed that the TiO 2 -Ag 2 O composite nanorods have high crystallinity. Moreover, precise control of the Ag 2 O sputtering duration realized the dispersive decoration of the Ag 2 O particles on the surfaces of the TiO 2 nanorods. By contrast, aggregation of the massive Ag 2 O particles occurred with a prolonged Ag 2 O sputtering duration; this engendered a layered coverage of the Ag 2 O clusters on the surfaces of the TiO 2 nanorods. The TiO 2 -Ag 2 O composite nanorods with different Ag 2 O coverage morphologies were used as chemoresistive sensors for the detection of trace amounts of NO 2 gas. The NO 2 gas-sensing performances of various TiO 2 -Ag 2 O composite nanorods were compared with that of pristine TiO 2 nanorods. The underlying mechanisms for the enhanced sensing performance were also discussed.

nanomaterials

Design of Nanoscaled Surface Morphology of TiO2–Ag2O Composite Nanorods through Sputtering Decoration Process and Their Low-Concentration NO2 Gas-Sensing Behaviors