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- Title
Synthesis and Characterization of Graphene–Silver Nanoparticle Hybrid Materials.
- Authors
Osváth, Zoltán; Pálinkás, András; Piszter, Gábor; Molnár, György
- Abstract
Silver nanoparticles (Ag NPs) play important roles in the development of plasmonic applications. Combining these nanoparticles with graphene can yield hybrid materials with enhanced light–matter interaction. Here, we report a simple method for the synthesis of graphene–silver nanoparticle hybrids on highly oriented pyrolytic graphite (HOPG) substrates. We demonstrate by scanning tunneling microscopy and local tunneling spectroscopy measurements the electrostatic n-type doping of graphene by contact with silver. We show by UV-Vis reflectance investigations that the local surface plasmon resonance (LSPR) of Ag NPs partially covered with graphene is preserved for at least three months, i.e., three times longer than the LSPR of bare Ag NPs. The gradual loss of LSPR is due to the spontaneous sulfurization of non-covered Ag NPs, as revealed by scanning electron microscopy and energy-dispersive X-ray spectroscopy. We show that the Ag NPs completely sandwiched between graphene and HOPG do not sulfurize, even after one year.
- Subjects
SCANNING tunneling microscopy; SILVER nanoparticles; SURFACE plasmon resonance; TUNNELING spectroscopy; PYROLYTIC graphite; GRAPHENE; GRAPHENE synthesis; N-type semiconductors
- Publication
Materials (1996-1944), 2020, Vol 13, Issue 20, p4660
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma13204660