Core-shell ZnO/SnO₂ Nanorods: two-step Synthesis and Enhanced Ethanol Sensing Performance

Title:Core-shell ZnO/SnO₂ Nanorods: two-step Synthesis and Enhanced Ethanol Sensing Performance

Volume: 11 Issue: 4

Author(s): Guang Sun, Saisai Zhang, Yanwei Li, Fengxiao Qi, Honglin Chen and Zhanying Zhang

Affiliation:

Keywords: Core-shell nanorods, ethanol sensors, gas-sensing mechanism, heterostructured ZnO/SnO₂.

Abstract: Core-shell ZnO/SnO₂ nanorods (NRs) were successfully synthesized via a facile two-step synthesis route. ZnO NRs (core) with the diameter about 300–800 nm and the length about 2-2.5 µm were first synthesized via a hydrothermal route, and then a continuous SnO₂ layer (shell) with the thickness about 20-25 nm was easily coated on the ZnO NRs via a solvothermal route. Compared with pure ZnO NRs and SnO₂ nanoparticles (NPs), the ZnO/SnO₂ core-shell NRs show an obvious enhancement in gas sensing performance. The response of the sensor based on as-prepared ZnO/SnO₂ core-shell NRs to 100 ppm ethanol is as high as 29.5 at 340 °C, and the response and recovery time are found to be about 18 s and 11 s, respectively. The gas sensing mechanism of the ZnO/SnO₂ core-shell NRs was discussed in relation to ZnO/SnO₂ heterojunctions.

Cite this article as:

Sun Guang, Zhang Saisai, Li Yanwei, Qi Fengxiao, Chen Honglin and Zhang Zhanying, Core-shell ZnO/SnO₂ Nanorods: two-step Synthesis and Enhanced Ethanol Sensing Performance, Current Nanoscience 2015; 11 (4) . https://dx.doi.org/10.2174/1573413711666150202234602