201. Silver nanoparticle functionalized heterojunction NiO/SnO2 nanotubes for comprehensive sensitization of acetone sensor.
- Author
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Yang, Lei, Qin, Jiaqiong, Cui, Shaobo, and Liu, Wei
- Subjects
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NANOPARTICLES , *CARBON nanotubes , *ACETONE , *METAL oxide semiconductors , *NANOTUBES , *STANNIC oxide , *SILVER nanoparticles , *SILVER - Abstract
Acetone detection with a good sensitivity and a low operating temperature is crucial owing to the serious harm that acetone can cause to the environment and humans and its importance as a marker of diabetes in human exhalation. One-dimensional (1D) semiconductor metal oxides with easily accessible active sites are potential candidates for use in gas sensors; however, the facile synthesis of 1D nanotubes (NTs) remains a challenge. Herein, Ag–NiO/SnO 2 NTs are synthesized via an electrospinning process, followed by spin-coating permeation and subsequent annealing and chemical reduction; furthermore, the gas-sensing properties of the Ag–NiO/SnO 2 NTs are investigated. The Ag–NiO/SnO 2 NT-based sensor exhibits a rapid response to acetone (12 s) with excellent sensitivity and selectivity at a low operating temperature (190 °C). The lower acetone detection limit of the Ag–NiO/SnO 2 NT-based sensor is 50 ppb. The 1D porous NTs efficiently promote gas diffusion during reversible resistance signal cycling and provide numerous active sites. Furthermore, the conjunction of NiO nanograins with SnO 2 nanograins forms a heterogeneous construction, enhancing the gas sensitivity of the sensing layers. In addition, Ag nanoparticles homogeneously incorporated onto the surface of the 1D NTs enhance substantially the acetone detection capability based on noble-metal sensitization. [Display omitted] • Ag-NiO/SnO 2 NTs were obtained by an easy and general route. • Ag-NiO/SnO 2 NTs promote the adsorption and desorption speed of gas molecules. • The Ag-NiO/SnO 2 NTs sensor shows outstanding acetone sensing properties. • The construction of p-n heterojunction enlarges the electron depletion layer. • The decoration of Ag NPs promotes the dissociation of adsorbed oxygen. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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