期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 251, 期 -, 页码 1068-1075出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.05.173
关键词
Porous ZnO films; UV-assisted photocurrent; O-2 sensor; Dissolved oxygen detection
资金
- Research Grants Council of the Hong Kong Administrative Region [PolyU 5016/08P, B-Q10N, 5242/11E, B-Q26D]
- NSF of China [51502186, 11574227, 11374225]
- Innovative Technology Fund [ITS/558/09, ZP2U, K.11.27.ZP2U]
- Hong Kong Polytechnic University [G-UA7P, G-YBB6, G-YBFU, G-YM42]
Room-temperature dynamic light-enhanced galvanometric response of supersonic cluster beam deposited (SCBD) zinc oxide (ZnO) films to oxygen (O-2) was investigated. The photocurrent was recorded when above-bandgap light is turned on, being maintained and turned off. Measurements were done in dry gaseous environment, and repeated in dry and wet gaseous environment after adding a water-proof superhydrophobic polymer coating on top. A dissolved oxygen sensor prototype made of a polymer coated ZnO film was fabricated to detect oxygen content in water. A model involving photo generation and recombination of electron-hole pairs, trapping and release of conduction electrons associated with sorption-desorption processes of oxygen was proposed. A practical method for determining the 02 concentration in the media based on fitting parameters to the dynamic photocurrent was tested. (C) 2017 Elsevier B.V. All rights reserved.
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