Enhanced NO2 gas-sensing performance of Pd/ZnO-codecorated SnO2 nanorod sensors
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SnO2 nanorods codecorated with Pd and ZnO were synthesized using a three-step process involving: the synthesis of SnO2 nanorods by the thermal evaporation of Sn powders followed by the sol–gel deposition of ZnO and Pd nanoparticles. The NO2 gas-sensing properties of the nanorods were examined. The nanorods were composed of primitive tetragonal-structured single crystal SnO2, while the ZnO and Pd nanoparticles were composed of wurtzite-structured ZnO single crystal and face-centered cubic-structured Pd single crystal, respectively. The Pd/ZnO-codecorated SnO2 nanorod sensors showed a remarkably enhanced response to NO2 compared to either ZnO or Pd-decorated SnO2 nanorod sensors. The responses of multiple networked Pd/ZnO-decorated SnO2 nanorod sensors were increased four to fivefold at NO2 concentrations ranging from 1 to 5 ppm Pd/ZnO-decorated SnO2 nanorod sensors which also showed shorter response and recovery times and higher selectivity than with ZnO or Pd-decorated SnO2 nanorod sensors. The NO2 sensing mechanism of the Pd/ZnO-codecorated SnO2 nanorods is also discussed.
This study was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (nos. 2015R1D1A1A01057029 and 2010–0020163).
- 27.K. Nejati, Z. Rezvani, R. Pakizevand, Int. Nano Lett. 1, 75–81 (2011)Google Scholar