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Applied Physics Letters / Volume 91 / Issue 18 / STRUCTURAL, MECHANICAL, THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER

Appl. Phys. Lett. 91, 181910 (2007); http://dx.doi.org/10.1063/1.2802730 (3 pages)

A hydrogen sensor based on tunneling between palladium clusters

J. van Lith1, A. Lassesson1, S. A. Brown2, M. Schulze1, J. G. Partridge3, and A. Ayesh3

1Nano Cluster Devices Ltd., Rutherford Building, University of Canterbury, Christchurch 8140, New Zealand
2Nano Cluster Devices Ltd., Nanostructure Engineering Science and Technology (NEST) Group, and MacDiarmid Institute for Advanced Materials and Nanotechnology, Rutherford Building, University of Canterbury, Christchurch 8140, New Zealand
3Nanostructure Engineering Science and Technology (NEST) Group and MacDiarmid Institute for Advanced Materials and Nanotechnology, Rutherford Building, University of Canterbury, Christchurch 8140, New Zealand

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(Received 7 August 2007; accepted 5 October 2007; published online 30 October 2007)

We describe nanocluster based tunneling sensors for detecting hydrogen. Pd clusters with diameters ranging from 3.5 to 6 nm are deposited between a pair of contacts until a predetermined resistance between the contacts is obtained. We demonstrate that the conduction through the cluster film is dominated by tunneling gaps. Upon exposure to hydrogen, the clusters expand, reducing the average size of the gaps and reducing the measured resistance. The sensor response as a function of external hydrogen pressure is described, for different cluster sizes and different operating temperatures, by a simple model with a single physically meaningful fitting parameter.

© 2007 American Institute of Physics

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KEYWORDS and PACS

Keywords

chemical sensors, metal clusters, metallic thin films, nanostructured materials, palladium, tunnelling

PACS

  • 07.07.Df

    Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2802730

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    J. Schmelzer, S. A. Brown, A. Wurl, M. Hyslop, and R. J. Blaikie, Phys. Rev. Lett. 88, 226802 (2002).

    M. W. Lee and R. Glosser, J. Appl. Phys. 57, 5236 (1985)JAPIAU000057000012005236000001.


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