Low-temperature chemical solution route for ZnO based sulfide coaxial nanocables: general synthesis and gas sensor application
Du, Ning; Zhang, Hui; Chen, Bingdi; Wu, Jianbo; Yang, Deren; Yang, Deren;; Du, Ning; State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, People’s Republic of China; Zhang, Hui; State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, People’s Republic of China; Chen, Bingdi; State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, People’s Republic of China; Wu, Jianbo; State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, People’s Republic of China
Журнал:
Nanotechnology
Дата:
2007-03-21
Аннотация:
A novel chemical solution approach has been developed to synthesize ZnO based sulfide coaxial nanocables such as ZnO/ZnS and ZnO/CdS by chemical reaction in tetrahydrofuran (THF; C<sub>4</sub>H<sub>8</sub>O), in which sulfur, NaBH<sub>4</sub> and ZnCl<sub>2</sub> or CdCl<sub>2</sub> were used as reactants and ZnO nanorods were used as the template at room temperature. The morphology and structure of ZnO/ZnS and ZnO/CdS coaxial nanocables have been characterized by transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), x-ray powder diffraction (XRD), x-ray photoelectron spectroscopy (XPS) and Brunauer–Emmett–Teller (BET) analysis. Furthermore, the as-prepared ZnO/CdS coaxial nanocables have been applied as NH<sub>3</sub> gas sensors at room temperature with superior sensitivity, good reproducibility and a short response/recovery time. Finally, a first explanation for the improved performance of the ZnO/CdS coaxial nanocable based gas sensors has been presented.
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