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 language | English |
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Pages (from-to) | 1029-1032 |
Number of pages | 4 |
Journal | Applied Physics A: Materials Science and Processing |
Volume | 80 |
Issue number | 5 |
DOIs | |
State | Published - Feb 2005 |