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Design, Fabrication and Testing of a Novel Gas Sensor utilizing Vertically Aligned Zinc Oxide Nanowire Arrays

Published online by Cambridge University Press:  01 February 2011

Prahalad Parthangal ,
Richard Cavicchi  and
Michael Zachariah
Prahalad Parthangal
Affiliation:
[email protected], University of Maryland, Mechanical Engineering, 2121 Glenn L. Martin Hall, College Park, MD, 20742, United States, 301-975-5215, 301-975-8288
Richard Cavicchi
Affiliation:
[email protected], NIST, Process Measurements Division, Gaithersburg, MD, 20899, United States
Michael Zachariah
Affiliation:
[email protected], University of Maryland, Mechanical Engineering and Chemistry, College Park, MD, 20742, United States
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Abstract

We report on a novel, non-destructive, in-situ approach toward connecting and electrically contacting vertically aligned zinc oxide nanowire arrays using conductive gold nanoparticles. A chemical gas-sensing device was constructed and tested using this nano-architecture. Well-aligned, single-crystalline zinc oxide nanowires were grown through a direct thermal evaporation process at 550 °C on gold catalyst layers. Electrical contact to the top of the NW array was established by creating a contiguous nanoparticle film through electrostatic attachment of conductive gold nanoparticles exclusively onto the tips of nanowires. The gas-sensing device fabricated through this approach was found to be sensitive to both reducing (methanol) and oxidizing (nitrous oxides) gases. This assembly approach is amenable to any array of one-dimensional nanostructures for which a top contact electrode is needed.

Keywords

nanoscalesensorsemiconducting
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 951: Symposium E – Nanofunctional Materials, Nanostructures and Novel Devices for Biological and Chemical Detection , 2006 , 0951-E08-09
Copyright
Copyright © Materials Research Society 2007

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References

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