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 фев 2024
Accepted
19 мар 2024
First published
03 апр 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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