Abstract
Hierarchical and hollow cylinder comb-like nanostructures with ZnO backbones and SnO2 branches were successfully prepared by an ultrasonic spray pyrolysis process. The observation of field scanning electron microscopy and transmission electron microscopy showed that a high density of SnO2 nanowires grew epitaxially on as-synthesized ZnO nanorod arrays. The diameter and length of the SnO2 nanowires were about 50 nm and 300 nm. The morphologies of ZnO/SnO2 hierarchical nanostructures could be tailored by changing the growth time of SnO2 nanowires. A possible formation process and growth mechanism are proposed from the viewpoint of inside-out Ostwald ripening. In addition, gas sensors based on the hierarchical ZnO/SnO2 nanostructures were fabricated and exhibited good response to ethanol. At an ethanol concentration of 100 ppm, the response was about 11 and the response time was about 1 s at the operating temperature of 275 °C.
Original language | English |
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Pages (from-to) | 6135-6140 |
Number of pages | 6 |
Journal | CrystEngComm |
Volume | 16 |
Issue number | 27 |
DOIs | |
Publication status | Published - Jul 21 2014 |
All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics