Surface-plasmon-enhanced ultraviolet emission of Au-decorated ZnO structures for gas sensing and photocatalytic devices

Pure and Au-decorated sub-micrometer ZnO spheres were successfully grown on glass substrates by simple chemical bath deposition and photoreduction methods. The analysis of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images, energy-dispersive X-ray spectroscopy (EDS)...

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Bibliographic Details
Published in:Beilstein journal of nanotechnology 2018-03, Vol.9 (1), p.771-779
Main Authors: Do, T Anh Thu, Ho, Truong Giang, Bui, Thu Hoai, Pham, Quang Ngan, Giang, Hong Thai, Do, Thi Thu, Nguyen, Duc Van, Tran, Dai Lam
Format: Article
Language:English
Subjects:
Au-decorated ZnO
carrier dynamics
Catalysis
Charge transfer
Decoration
Detection
Dielectric properties
Electron microscopy
Energy dispersive X ray spectroscopy
Energy transmission
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Gas sensors
Gases
Glass substrates
Gold
Image transmission
Lasers
Nanoparticles
Nanoscience
Nanotechnology
Nitrogen dioxide
photocatalyst
Photochemistry
Photodegradation
Photoluminescence
Photovoltaic cells
Recovery time
Sensitivity enhancement
Sensors
Spectrum analysis
Spheres
SPR effect
Ultraviolet emission
Zinc oxide
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Summary:Pure and Au-decorated sub-micrometer ZnO spheres were successfully grown on glass substrates by simple chemical bath deposition and photoreduction methods. The analysis of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images, energy-dispersive X-ray spectroscopy (EDS), UV-vis absorption, and photoluminescence (PL) spectra results were used to verify the incorporation of plasmonic Au nanoparticles (NPs) on the ZnO film. Time-resolved photoluminescence (TRPL) spectra indicated that a surface plasmonic effect exists with a fast rate of charge transfer from Au nanoparticles to the sub-micrometer ZnO sphere, which suggested the strong possibility of the use of the material for the design of efficient catalytic devices. The NO sensing ability of as-deposited ZnO films was investigated with different gas concentrations at an optimized sensing temperature of 120 °C. Surface decoration of plasmonic Au nanoparticles provided an enhanced sensitivity (141 times) with improved response (τ = 9 s) and recovery time (τ = 39 s). The enhanced gas sensing performance and photocatalytic degradation processes are suggested to be attributed to not only the surface plasmon resonance effect, but also due to a Schottky barrier between plasmonic Au and ZnO structures.
ISSN:2190-4286
2190-4286
DOI:10.3762/bjnano.9.70