Hydrogen and ozone gas sensing using multiple ZnO nanorods

B. S. Kang, Y. W. Heo, L. C. Tien, D. P. Norton, F. Ren, B. P. Gila, S. J. Pearton

Research output: Contribution to journalArticlepeer-review

112 Scopus citations

Abstract

ZnO nanorods grown by site-selective molecular beam epitaxy show current-voltage characteristics that are sensitive to the presence of hydrogen or ozone in the measurement ambient for temperatures as low as ∼ 112°C for H2 or room temperature for O3. The sensitivity to hydrogen increases sharply with temperature and multiple nanorods contacted at both ends by ohmic electrodes show currents of ∼ 10-8 A at 200°C and a differential current change of ∼ 18% when changing from a pure N2 ambient to 10% H2 in N2. The nanorods are able to detect small concentrations (3%) of O3 in O2, with changes in current of ∼ 10-7 A at 25°C. The sensitivity was 21% for O3 at room temperature. The nanorods also show a strong response to above-band-gap illumination with ultraviolet light.

Original languageEnglish
Pages (from-to)1029-1032
Number of pages4
JournalApplied Physics A: Materials Science and Processing
Volume80
Issue number5
DOIs
StatePublished - Feb 2005

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