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Fast response characteristics of hydrogen sensors based on Pd nanoparticle films with controlled coverage

  • Bo Xie
  • Mengyang Zheng
  • Fei Liu
  • Xing Peng
  • Guanghou Wang
  • Min Han
Research Paper

Abstract

The response time of the quantum conductance-based hydrogen sensor fabricated from films consisting of closely spaced palladium nanoparticles formed with cluster beam deposition was investigated. The dependence of the response time on the coverage-regulated nanoparticle size, as well as the hydrogen pressure, was determined. At low hydrogen pressure, the response time is dominated by the hydriding time of the larger Pd nanoparticles. Fast response as short as 3 s to 1,000 Pa H2 could be realized with the lower coverage nanoparticle film, with a sensitive change of the relative conductance as high as 70 %. At 10 kPa hydrogen pressure, subsecond hydrogen response could be realized. With the increase of the hydrogen pressure, the response time of the devices becomes longer and longer as determined by the hydriding time of the Pd nanoparticles involved in the smaller size population of the size distribution, and approaches the same value for the hydrogen sensors with different nanoparticle coverages. The abnormal increase of the response time accompanied by the formation of the α + β coexistence phase of PdH x was also investigated.

Keywords

Palladium nanoparticles Hydrogen sensor Response time Quantum conductance 

Notes

Acknowledgments

The authors thank the National Natural Science Foundation of China (Grant nos. 10974092, 51171077), the National Basic Research Program of China (973 Program, Grant no. 2009CB930501), and the Industrialization Promotion of University Research Program in Jiangsu Province under the contract No. JH10-2. This research was also supported by a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Bo Xie
    • 1
  • Mengyang Zheng
    • 1
  • Fei Liu
    • 1
  • Xing Peng
    • 1
  • Guanghou Wang
    • 2
  • Min Han
    • 1
  1. 1.National Laboratory of Solid State Microstructures, Department of Materials Science and EngineeringNanjing UniversityNanjingChina
  2. 2.National Laboratory of Solid State Microstructures, Department of PhysicsNanjing UniversityNanjingChina

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