Ozone detection in the ppt-level with rGO-ZnO based sensor

[Display omitted] •This article presents an innovative approach for the development of rGO/SMOx-based for gas sensing applications.•The nanocomposite material exhibited a superior surface area due to the laser reduction process of graphene oxide.•The metal oxide layer acts as an environmental shield...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2021-07, Vol.338, p.129779, Article 129779
Main Authors: de Lima, B.S., Komorizono, A.A., Silva, W.A.S., Ndiaye, A.L., Brunet, J., Bernardi, M.I.B., Mastelaro, V.R.
Format: Article
Language:English
Subjects:
Deposition
Engineering Sciences
Gas sensor
Gas sensors
High temperature
Laser processing
Magnetron sputtering
Nanocomposite
Nanocomposites
Nanoparticles
Ozone
Photovoltaic cells
rGO
Ultraviolet lasers
Zinc oxide
ZnO
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Summary:[Display omitted] •This article presents an innovative approach for the development of rGO/SMOx-based for gas sensing applications.•The nanocomposite material exhibited a superior surface area due to the laser reduction process of graphene oxide.•The metal oxide layer acts as an environmental shield to the rGO layer and allows it to operate at high temperatures.•The nanocomposites exhibited a limit of detection 10 times lower than pure ZnO for ozone detection. Although several studies have explored the rGO-ZnO nanocomposites gas sensing properties towards many gases, only a few are devoted to ozone detection. This paper explores a novel synthesis procedure of rGO-ZnO nanocomposites based upon a two-step physical process. Namely, a reduction process of GO carried out using UV laser radiation followed by a deposition of ZnO nanoparticles on the rGO surface by RF-magnetron Sputtering. Our results demonstrate that the deposition of ZnO on the surface of the rGO film produces a stable and conductive material with a larger surface area. Consequently, this material is able to operate at high temperatures and exhibited a limit of detection (LOD) in the range of 100 ppt, while pure ZnO exhibited LOD in the vicinity of 1 ppb.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2021.129779