title: Influence of the layer thickness in plasmonic gold nanoparticles produced by thermal evaporation.
abstract: Metallic nanoparticles (NPs) have received recently considerable interest of photonic and photovoltaic communities. In this work, we report the optoelectronic properties of gold NPs (Au-NPs) obtained by depositing very thin gold layers on glass substrates through thermal evaporation electron-beam assisted process. The effect of mass thickness of the layer was evaluated. The polycrystalline Au-NPs, with grain sizes of 14 and 19 nm tend to be elongated in one direction as the mass thickness increase. A 2 nm layer deposited at 250°C led to the formation of Au-NPs with 10-20 nm average size, obtained by SEM images, while for a 5 nm layer the wide size elongates from 25 to 150 nm with a mean at 75 nm. In the near infrared region was observed an absorption enhancement of amorphous silicon films deposited onto the Au-NPs layers with a corresponding increase in the PL peak for the same wavelength region.
authors.affiliation: CENIMAT/I3N, Departamento de Ciência dos Materiais and CEMOP/UNINOVA, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal.
authors.forename: D
authors.initials: D
authors.lastname: Gaspar
authors.forename: A C
authors.initials: AC
authors.lastname: Pimentel
authors.forename: T
authors.initials: T
authors.lastname: Mateus
authors.forename: J P
authors.initials: JP
authors.lastname: Leitão
authors.forename: J
authors.initials: J
authors.lastname: Soares
authors.forename: B P
authors.initials: BP
authors.lastname: Falcão
authors.forename: A
authors.initials: A
authors.lastname: Araújo
authors.forename: A
authors.initials: A
authors.lastname: Vicente
authors.forename: S A
authors.initials: SA
authors.lastname: Filonovich
authors.forename: H
authors.initials: H
authors.lastname: Aguas
authors.forename: R
authors.initials: R
authors.lastname: Martins
authors.forename: I
authors.initials: I
authors.lastname: Ferreira
mesh_terms: D006046:Gold / Q000737:chemistry*; D006358:Hot Temperature; D008027:Light; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000379:methods*
chemical_list: D006046:Gold
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