| Citation: |
Cheng Zhiming, Zhou Sumei, Chen Tongyun, Dong Yongping, Zhang Wangbing, Chu Xiangfeng. Acetic acid gas sensors based on Ni2+ doped ZnO nanorods prepared by using the solvothermal method[J]. Journal of Semiconductors, 2012, 33(11): 112003. doi: 10.1088/1674-4926/33/11/112003
Cheng Z M, Zhou S M, Chen T Y, Dong Y P, Zhang W B, Chu X F. Acetic acid gas sensors based on Ni2+ doped ZnO nanorods prepared by using the solvothermal method[J]. J. Semicond., 2012, 33(11): 112003. doi: 10.1088/1674-4926/33/11/112003.
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Acetic acid gas sensors based on Ni2+ doped ZnO nanorods prepared by using the solvothermal method
doi: 10.1088/1674-4926/33/11/112003
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Abstract
Ni2+-doped ZnO nanorods with different doping concentrations are prepared via the solvothermal method. The doped ZnO nanorods are characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The amount of Ni2+ ions that enter the lattice of ZnO increases with increasing the Ni2+/Zn2+ molar ratio when the molar ratio of Ni2+/Zn2+ in the starting solution is lower than 3% and does not change obviously if the mole ratio of Ni2+/Zn2+ in the starting solution is in the range of 3-10 mol%. The effect of Ni2+ doping on the gas-sensing properties is investigated. The results reveal that the amount of Ni2+ has a great influence on the response (Ra/Rg) and the gas-sensing selectivity. The sensor based on 1 mol % Ni2+ doped ZnO nanorods (120 ℃, 10 h) exhibits a high response to acetic acid vapor, in particular, the responses to 0.001 ppm and 0.01 ppm acetic acid vapor reach 1.6 and 2, respectively. The response time and the recovery time for 0.001 ppm acetic acid are only 4 s and 27 s, respectively.-
Keywords:
- ZnO,
- nanorods,
- gas sensor,
- acetic acid
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References
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