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A sub-ppm level formaldehyde gas sensor based on Zn-doped NiO prepared by a co-precipitation route

Lontio Fomekong, R. and Tedjieukeng Kamta, H.M. and Ngolui Lambi, J. and Lahem, D. and Eloy, P. and Debliquy, M. and Delcorte, A. (2017) A sub-ppm level formaldehyde gas sensor based on Zn-doped NiO prepared by a co-precipitation route. Journal of Alloys and Compounds, 731, pp. 1188-1196. Elsevier. ISSN 0925-8388

Full text not available from this repository.

Official URL: http://dx.doi.org/10.1016/j.jallcom.2017.10.089

Abstract

Doping is an important and effective way to improve the gas sensing properties of sensors based on metal oxide semiconductors. Undoped NiO and Zn-doped NiO (with 2%, 3% and 4% of Zn) were successfully synthesized by a thermal treatment of the corresponding nickel zinc malonate previously prepared by a controlled coprecipitation in aqueous solution. The phase identification, the texture, the morphologies and the chemical composition (including the chemical state of Zn and Ni) for all the samples were investigated by a set of techniques such as XRD, BET, SEM and XPS respectively. The comparison of the gas-sensing properties towards formaldehyde of the undoped NiO and the Zn-doped NiO was also carried out. Among all the as synthesized materials, the 3% Zn-doped NiO exhibited significantly enhanced formaldehyde sensing properties, including lower operating temperature (200 °C), higher sensitivity, better selectivity, low detection limit and good reproducibility. The response (defined by S = (Rgas/Rair -1) for reducing gases) of the as prepared 3% Zn-doped NiO to 1.4 ppm at 200 °C is 5 times higher than that of undoped NiO. The experimental detection limit is 74 ppb which is lower than the limit set by WHO (80 ppb). The possible gas-sensing mechanism is discussed. The enhancement of sensor properties for 3% Zn-doped NiO can be explained by the effect of Zn on both, the quantity of adsorbed oxygen on the surface and the conductivity of the material. The catalytic activity of ZnO also plays a key role on the sensor performance.

Item URL in elib:https://elib.dlr.de/117070/
Document Type:Article
Title:A sub-ppm level formaldehyde gas sensor based on Zn-doped NiO prepared by a co-precipitation route
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lontio Fomekong, R.UNSPECIFIEDUNSPECIFIED
Tedjieukeng Kamta, H.M.UNSPECIFIEDUNSPECIFIED
Ngolui Lambi, J.UNSPECIFIEDUNSPECIFIED
Lahem, D.UNSPECIFIEDUNSPECIFIED
Eloy, P.UNSPECIFIEDUNSPECIFIED
Debliquy, M.UNSPECIFIEDUNSPECIFIED
Delcorte, A.UNSPECIFIEDUNSPECIFIED
Date:2017
Journal or Publication Title:Journal of Alloys and Compounds
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:731
Page Range:pp. 1188-1196
Publisher:Elsevier
ISSN:0925-8388
Status:Published
Keywords:Pristine nickel oxide. Zn-dopant, Co-precipitation synthesis, Gas sensor, Formaldehyde
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignment
DLR - Research theme (Project):L - no assignment
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Lontio Fomekong, Roussin
Deposited On:12 Dec 2017 07:46
Last Modified:06 Sep 2019 15:18

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