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Journal of Materials Science

, Volume 49, Issue 1, pp 347–352 | Cite as

Synthesis of ZnO nanorod arrays on Zn substrates by a gas–solution–solid method and their application as an ammonia sensor

  • Yongfu Qiu
  • Minlin Yang
  • Hongbo Fan
  • Yongjun Xu
  • Youyuan Shao
  • Xiaoxi Yang
  • Shihe Yang
Article

Abstract

The design of the 1D nano-structured material arrays on substrates is required for the development of conductivity sensors. A simple method, the so-called gas–solution–solid, has been developed to prepare ZnO nanorod arrays on Zn substrate. The method consists of putting Zn foils above an ammonia solution for about 24 h to obtain the aligned ZnO nanorods on substrates. The sizes of ZnO nanorod arrays could be controlled by adjusting the concentration of the ammonia–water solution and reaction time. Moreover, the growth mechanism of the nanorod arrays was studied and proposed. In the proposed mechanism, the Zn source from the Zn foil is first oxidized to ZnO and Zn2+ by oxygen. Then ZnO nanorod arrays are grown with the help of ammonia in the solution as a transporter of zinc ions. The nanorod arrays growth mechanism involves oxygen gas, ammonia solution, and Zn foil, and is, therefore, named as gas–solution–solid mechanism. Finally, the NH3 sensing properties were measured and the results showed that ZnO nano-array sensor has high sensitivity and reversibility for NH3 sensing at the room temperature and the sensitivity increases with increasing gas concentration.

Graphical Abstract

Keywords

Ammonia Solution Nanorod Array Conductivity Sensor Nanorod Growth Increase Ammonia Concentration 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The work described in this paper was supported by the National Natural Science Foundation of China (No. 51206029) and the National Basic Research Program of China (2010CB227306).

Supplementary material

10853_2013_7711_MOESM1_ESM.docx (39 kb)
Figure S1 Diagram for the gas sensitivity measurement apparatus

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Yongfu Qiu
    • 1
  • Minlin Yang
    • 1
  • Hongbo Fan
    • 1
  • Yongjun Xu
    • 1
  • Youyuan Shao
    • 1
  • Xiaoxi Yang
    • 1
  • Shihe Yang
    • 2
  1. 1.Guangdong Provincial Key Laboratory of Distributed Energy Systems, College of Chemistry and Environmental EngineeringDongguan University of TechnologyGuangdongPeople’s Republic of China
  2. 2.Department of ChemistryThe Hong Kong University of Science and TechnologyKowloonPeople’s Republic of China

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