Room-temperature polymer-coated supersonic cluster beam deposited ZnO film for O2gas and dissolved O2sensing

Man Hon Wong; Ngai Hang Ng; Meng Zhao; Ka Seng Lau; Hau Chung Man; Jeffery T. Cheung; Chung Wo Ong

doi:10.1016/j.snb.2017.05.173

Room-temperature polymer-coated supersonic cluster beam deposited ZnO film for O₂gas and dissolved O₂sensing

Man Hon Wong, Ngai Hang Ng, Meng Zhao, Ka Seng Lau, Hau Chung Man, Jeffery T. Cheung, Chung Wo Ong

Research output: Journal article publication › Journal article › Academic research › peer-review

3 Citations (Scopus)

Abstract

Room-temperature dynamic light-enhanced galvanometric response of supersonic cluster beam deposited (SCBD) zinc oxide (ZnO) films to oxygen (O2) 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 O2concentration in the media based on fitting parameters to the dynamic photocurrent was tested.

Original language	English
Pages (from-to)	1068-1075
Number of pages	8
Journal	Sensors and Actuators, B: Chemical
Volume	251
DOIs	https://doi.org/10.1016/j.snb.2017.05.173
Publication status	Published - 1 Nov 2017

Keywords

Dissolved oxygen detection
O sensor 2
Porous ZnO films
UV-assisted photocurrent

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Instrumentation
Condensed Matter Physics
Surfaces, Coatings and Films
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

More information

10.1016/j.snb.2017.05.173

http://hdl.handle.net/10397/104299

Cite this

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title = "Room-temperature polymer-coated supersonic cluster beam deposited ZnO film for O2gas and dissolved O2sensing",

abstract = "Room-temperature dynamic light-enhanced galvanometric response of supersonic cluster beam deposited (SCBD) zinc oxide (ZnO) films to oxygen (O2) 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 O2concentration in the media based on fitting parameters to the dynamic photocurrent was tested.",

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AU - Wong, Man Hon

AU - Ng, Ngai Hang

AU - Zhao, Meng

AU - Lau, Ka Seng

AU - Man, Hau Chung

AU - Cheung, Jeffery T.

AU - Ong, Chung Wo

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AB - Room-temperature dynamic light-enhanced galvanometric response of supersonic cluster beam deposited (SCBD) zinc oxide (ZnO) films to oxygen (O2) 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 O2concentration in the media based on fitting parameters to the dynamic photocurrent was tested.

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KW - O sensor 2

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KW - UV-assisted photocurrent

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