Formaldehyde gas sensing using metal oxide semiconductor: a brief review

Purpose This review aims to give an overview about zinc oxide (ZnO) based gas sensors and the role of doping in enhancing the gas sensing properties. Gas sensors based on ZnO thin film are preferred for sensing applications because of their modifiable surface morphology, very large surface-to-volume...

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Bibliographic Details
Published in:Sensor review 2022-08, Vol.42 (5), p.554-567
Main Authors: Ishak, Syafiqah, Johari, Shazlina, Ramli, Muhammad Mahyiddin, Darminto, Darminto
Format: Article
Language:English
Subjects:
Adsorption
Cancer
Chromatography
Dopants
Doping
Electrical properties
Electrical resistivity
Formaldehyde
Gallium
Gas sensors
Gases
Metal oxide semiconductors
Metal oxides
Morphology
Nanostructured materials
Operating temperature
Optics
Response time
Semiconductors
Sensors
Surface reactions
Surface stability
Thin films
Tin
Zinc oxide
Zinc oxides
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Summary:Purpose This review aims to give an overview about zinc oxide (ZnO) based gas sensors and the role of doping in enhancing the gas sensing properties. Gas sensors based on ZnO thin film are preferred for sensing applications because of their modifiable surface morphology, very large surface-to-volume ratio and superior stability due to better crystallinity. The gas detection mechanism involves surface reaction, in which the adsorption of gas molecules on the ZnO thin film affects its conductivity and reduces its electrical properties. One way to enhance the gas sensing properties is by doping ZnO with other elements. A few of the common and previously used dopants include tin (Sn), nickel (Ni) and gallium (Ga). Design/methodology/approach In this brief review, previous works on doped-ZnO formaldehyde sensing devices are presented and discussed. Findings Most devices provided good sensing performance with low detection limits. The reported operating temperatures were within the range of 200̊C –400̊C. The performance of the gas sensors can be improved by modifying their nanostructures and/or adding dopants. Originality/value As of yet, a specific review on formaldehyde gas sensors based on ZnO metal semiconductors has not been done.
ISSN:0260-2288
1758-6828
0260-2288
DOI:10.1108/SR-04-2021-0136