Highly sensitive hydrogen detection of catalyst-free ZnO nanorod networks suspended by lithography-assisted growth

Junghwan Huh, Jonghyurk Park, Gyu-Tae Kim, Jeong Young Park

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

We have successfully demonstrated a ZnO nanorod-based 3D nanostructure to show a high sensitivity and very fast response/recovery to hydrogen gas. ZnO nanorods have been synthesized selectively over the pre-defined area at relatively low temperature using a simple self-catalytic solution process assisted by a lithographic method. The conductance of the ZnO nanorod device varies significantly as the concentration of the hydrogen is changed without any additive metal catalyst, revealing a high sensitivity to hydrogen gas. Its superior performance can be explained by the porous structure of its three-dimensional network and the enhanced surface reaction of the hydrogen molecules with the oxygen defects resulting from a high surface-to-volume ratio. It was found that the change of conductance follows a power law depending on the hydrogen concentration. A Langmuir isotherm following an ideal power law and a cross-over behavior of the activation energy with respect to hydrogen concentration were observed. This is a very novel and intriguing phenomenon on nanostructured materials, which suggests competitive surface reactions in ZnO nanorod gas sensors.

Original languageEnglish
Article number085502
JournalNanotechnology
Volume22
Issue number8
DOIs
Publication statusPublished - 2011 Feb 25

Fingerprint

Nanotubes
Nanorods
Lithography
Hydrogen
Catalysts
Growth
Nanostructures
Gases
Surface reactions
Chemical sensors
Nanostructured materials
Isotherms
Activation energy
Metals
Oxygen
Recovery
Equipment and Supplies
Defects
Molecules
Temperature

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

Cite this

Highly sensitive hydrogen detection of catalyst-free ZnO nanorod networks suspended by lithography-assisted growth. / Huh, Junghwan; Park, Jonghyurk; Kim, Gyu-Tae; Park, Jeong Young.

In: Nanotechnology, Vol. 22, No. 8, 085502, 25.02.2011.

Research output: Contribution to journalArticle

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