Issue 10, 2024

Fabrication of a room-temperature NO2 gas sensor with high performance at the ppb level using an rGO/BiOCl heterostructure

Abstract

In recent years, the continuous and accurate detection of human hazardous gases, such as NO2, using a low-cost gas sensing device is quite important. For a new generation of gas sensors, rGO or 2-D materials have gained considerable attention. This work presents a low-temperature rGO/BiOCl heterojunction fabricated NO2 gas sensor that exhibits an excellent response (Rg/Ra = 3.78) for NO2 at 100 ppb compared to pristine BiOCl. The selected synthesis pathway results in the generation of a perforated floral morphology. Moreover, the sensor showed outperforming selectivity with a quick response/recovery of ∼9 s/21 s at ambient temperature (25 °C). Additionally, it has an ultralow LOD (∼0.06 ppb). Besides, the mechanism of gas sensing was initially elucidated through finite-difference time-domain (FDTD) simulation. This analysis confirms that rGO in BiOCl serves as a bridge, enhancing the transfer of electrons from BiOCl to NO2 and resulting in a substantial increase in the depletion region and a heightened sensor response. Our fabricated NO2 gas sensor offers a low gas detection limit with high accuracy and fast response at even lower temperatures.

Graphical abstract: Fabrication of a room-temperature NO2 gas sensor with high performance at the ppb level using an rGO/BiOCl heterostructure

Supplementary files

Article information

Article type
Paper
Submitted
19 2 2024
Accepted
19 3 2024
First published
03 4 2024
This article is Open Access
Creative Commons BY license

Mater. Adv., 2024,5, 4187-4199

Fabrication of a room-temperature NO2 gas sensor with high performance at the ppb level using an rGO/BiOCl heterostructure

N. Dhariwal, P. Yadav, A. Sanger, S. B. Kang, M. S. Goyat, Y. K. Mishra and V. Kumar, Mater. Adv., 2024, 5, 4187 DOI: 10.1039/D4MA00168K

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