In:
Journal of Materials Chemistry C, Royal Society of Chemistry (RSC), Vol. 10, No. 11 ( 2022), p. 4295-4305
Abstract:
Nitrogen dioxide (NO 2 ) is very toxic and harmful to humans and the environment; therefore, it is essential to develop a sensor for the detection of NO 2 gas. In this paper, a NO 2 sensing device was fabricated based on a Au-decorated ZnO/rGO heterostructure, which achieved a remarkable sensing response of 67.38 to 1 ppm NO 2 and a notably low theoretical detection limit of 138 parts per trillion (ppt) at a low working temperature of 60 °C. Here, we demonstrate a synthesis approach involving Au decoration on the surface of the ZnO/rGO heterojunction. The chemical, morphological, structural, and electrical properties of the Au@ZnO/rGO heterostructure were studied through various characterization techniques. The Au@ZnO/rGO nanocomposite-based sensor exhibited good linearity and time constants of 248 s and 170 s during the adsorption and desorption of NO 2 gas. Moreover, the Au@ZnO/rGO nanocomposite sensor demonstrated outstanding selectivity towards 1 ppm NO 2 , which is significantly higher than that of other interfering gases, indicating its potential for use in NO 2 gas detection. The exceptional sensing response is attributed to the higher catalytic activity or synergistic effect between Au and the ZnO/rGO heterostructure. This study delivers an effective method for improving the sensing performance of metal oxide-based nanomaterials.
Type of Medium:
Online Resource
ISSN:
2050-7526
,
2050-7534
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
2702245-6
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