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Quasicrystal Nanosheet/α-Fe 2 O 3 Heterostructure-Based Low Power NO 2 Sensors: Experimental and DFT Studies.
- Source :
-
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2024 Apr 03; Vol. 16 (13), pp. 16687-16698. Date of Electronic Publication: 2024 Mar 22. - Publication Year :
- 2024
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Abstract
- Industrial emissions, environmental monitoring, and medical fields have put forward huge demands for high-performance and low power consumption sensors. Two-dimensional quasicrystal (2D QC) nanosheets of metallic multicomponent Al <subscript>70</subscript> Co <subscript>10</subscript> Fe <subscript>5</subscript> Ni <subscript>10</subscript> Cu <subscript>5</subscript> have emerged as a promising material for gas sensors due to their excellent catalytic and electronic properties. Herein, we demonstrate highly sensitive and selective NO <subscript>2</subscript> sensors developed by low-cost and scalable fabrication techniques using 2D QC nanosheets and α-Fe <subscript>2</subscript> O <subscript>3</subscript> nanoparticles. The sensitivity (Δ R / R %) of the optimal amount of 2D QC nanosheet-loaded α-Fe <subscript>2</subscript> O <subscript>3</subscript> sensor was 32%, which is significantly larger about 3.5 times than bare α-Fe <subscript>2</subscript> O <subscript>3</subscript> sensors for 1 ppm of NO <subscript>2</subscript> at 150 °C operating temperature. The sensors exhibited p-type conduction, and resistance was reduced when exposed to NO <subscript>2</subscript> , an oxidizing gas. The enhanced sensing characteristics are a result of the formation of nanoheterojunctions between 2D QC and α-Fe <subscript>2</subscript> O <subscript>3</subscript> , which improved the charge transport and provided a large sensing signal. In addition, the heterojunction sensor demonstrated excellent NO <subscript>2</subscript> selectivity over other oxidizing and reducing gases. Furthermore, density functional theory calculation examines the adsorption energy and charge transfer between NO <subscript>2</subscript> molecules on the α-Fe <subscript>2</subscript> O <subscript>3</subscript> (110) and QC/α-Fe <subscript>2</subscript> O <subscript>3</subscript> (110) heterostructure surfaces, which coincides well with the experimental results.
Details
- Language :
- English
- ISSN :
- 1944-8252
- Volume :
- 16
- Issue :
- 13
- Database :
- MEDLINE
- Journal :
- ACS applied materials & interfaces
- Publication Type :
- Academic Journal
- Accession number :
- 38517362
- Full Text :
- https://doi.org/10.1021/acsami.4c00201