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Title: Room-temperature polymer-coated supersonic cluster beam deposited ZnO film for O-2 gas and dissolved O-2 sensing
Authors: Wong, MH 
Ng, NH 
Zhao, M
Lau, KS 
Man, HC 
Cheung, JT
Ong, CW 
Keywords: Porous ZnO films
UV-assisted photocurrent
O-2 sensor
Dissolved oxygen detection
Issue Date: 2017
Publisher: Elsevier
Source: Sensors and actuators. B, Chemical, 2017, v. 251, p. 1068-1075 How to cite?
Journal: Sensors and actuators. B, Chemical 
Abstract: 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.
ISSN: 0925-4005
EISSN: 1873-3077
DOI: 10.1016/j.snb.2017.05.173
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