Graphene-Encapsulated Silver Nanoparticles for Plasmonic Vapor Sensing

Graphene-covered silver nanoparticles were prepared directly on highly oriented pyrolytic graphite substrates and characterized by atomic force microscopy. UV–Vis reflectance spectroscopy was used to measure the shift in the local surface plasmon resonance (LSPR) upon exposure to acetone, ethanol, 2...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2022-07, Vol.12 (14), p.2473
Main Authors: Piszter, Gábor, Molnár, György, Pálinkás, András, Osváth, Zoltán
Format: Article
Language:English
Subjects:
Acetone
Aluminum
Annealing
Atomic force microscopy
Chemical vapor deposition
Defect annealing
Ethanol
Experiments
Graphene
graphene coating
LSPR-based sensing
Nanoparticles
Optical properties
Oxygen plasma
Plasma
Point defects
Principal components analysis
Production processes
Propanol
Pyrolytic graphite
Scanning electron microscopy
Silver
silver nanoparticles
Spectroscopy
Spectrum analysis
Substrates
Surface plasmon resonance
Toluene
VOC detection
VOCs
Volatile organic compounds
Water vapor
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Summary:Graphene-covered silver nanoparticles were prepared directly on highly oriented pyrolytic graphite substrates and characterized by atomic force microscopy. UV–Vis reflectance spectroscopy was used to measure the shift in the local surface plasmon resonance (LSPR) upon exposure to acetone, ethanol, 2-propanol, toluene, and water vapor. The optical responses were found to be substance-specific, as also demonstrated by principal component analysis. Point defects were introduced in the structure of the graphene overlayer by O2 plasma. The LSPR was affected by the plasma treatment, but it was completely recovered using subsequent annealing. It was found that the presence of defects increased the response for toluene and water while decreasing it for acetone.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano12142473