Volume 127, Number 5, September 2019
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||23 October 2019|
Anomalous conductance induced by hydrogen on ZnO and catalyzed ZnO nanoflowers
Department of Physics, BITS-Pilani, K.K. Birla Goa Campus - Zuarinagar, Goa 403726, India
Received: 15 April 2019
Accepted: 5 September 2019
In this work, we report on the anomalous conductance induced by hydrogen (H2) gas on as-grown and gold/palladium (Au/Pd)-catalyzed zinc oxide nanoflowers (ZnO NFs). The catalyzed ZnO NFs exhibited a sharp increase in conductivity on H2 exposure and the conductance persisted for several hours on removing H2. This anomalous behavior is in sharp contrast to conventional ZnO-based H2 gas sensors wherein the conductivity decreases on removing H2 gas. The as-grown ZnO NF sample showed drastic response to H2 under UV illumination with its conductivity increasing by almost 500%. We attribute our observation to catalyzed chemidesorption of oxygen from the ZnO lattice.
PACS: 71.20.Be – Transition metals and alloys / 68.43.Nr – Desorption kinetics / 81.20.-n – Methods of materials synthesis and materials processing
© EPLA, 2019
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