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Ag-Modified 3D Reduced Graphene Oxide Aerogel-Based Sensor with an Embedded Microheater for a Fast Response and High-Sensitive Detection of NO 2 .
- Source :
-
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2020 Jun 03; Vol. 12 (22), pp. 25243-25252. Date of Electronic Publication: 2020 May 21. - Publication Year :
- 2020
-
Abstract
- A chemiresistive gas sensor based on a three-dimensional Ag-modified reduced graphene oxide (3D Ag-rGO) aerogel is reported. We improve the graphene-based sensor performance by optimization of operating temperature, chemical modification, and new design of the material geometrical structure. The self-assembly and Ag nanoparticle (NP) decoration of the Ag-rGO aerogel are realized by a facile, one-step hydrothermal method. An integrated low-power microheater fabricated on a micromachined SiO <subscript>2</subscript> membrane is employed to enhance the performance of the sensor with a fast response to NO <subscript>2</subscript> and a shortened recovery time. The 3D Ag-rGO-based sensor at a temperature of 133 °C exhibits the highest response. At the same time, the response to other gases is suppressed while the response of the Ag-rGO sensor toward ammonia at 133 °C is reduced to half of the value at room temperature, demonstrating a greatly improved selectivity toward NO <subscript>2</subscript> . Additionally, the sensor exhibits a remarkably fast response to 50 ppb NO <subscript>2</subscript> and a low limit of detection of 6.9 ppb.
Details
- Language :
- English
- ISSN :
- 1944-8252
- Volume :
- 12
- Issue :
- 22
- Database :
- MEDLINE
- Journal :
- ACS applied materials & interfaces
- Publication Type :
- Academic Journal
- Accession number :
- 32391684
- Full Text :
- https://doi.org/10.1021/acsami.9b22098