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Título

Influence of size, shape and core-shell interface on surface plasmon resonance in Ag and Ag@MgO nanoparticle films deposited on Si/SiOx

AutorD'Addato, Sergio; Bergamini, Luca
Palabras claveSurface plasmon resonance
Surface differential reflectivity
MgO
Ag
Core–shell nanoparticles
Electron microscopy
Fecha de publicación2015
EditorBeilstein-Institut für Literatur der Organischen Chemie
CitaciónBeilstein Journal of Nanotechnology 6: 404-413 (2015)
ResumenAg and Ag@MgO core-shell nanoparticles (NPs) with a diameter of d = 3-10 nm were obtained by physical synthesis methods and deposited on Si with its native ultrathin oxide layer SiOx (Si/SiOx). Scanning electron microscopy and transmission electron microscopy (TEM) images of bare Ag NPs revealed the presence of small NP aggregates caused by diffusion on the surface and agglomeration. Atomic resolution TEM gave evidence of the presence of crystalline multidomains in the NPs, which were due to aggregation and multitwinning occurring during NP growth in the nanocluster source. Co-deposition of Ag NPs and Mg atoms in an oxygen atmosphere gave rise to formation of a MgO shell matrix surrounding the Ag NPs. The behaviour of the surface plasmon resonance (SPR) excitation in surface differential reflectivity (SDR) spectra with p-polarised light was investigated for bare Ag and Ag@MgO NPs. It was shown that the presence of MgO around the Ag NPs caused a red shift of the plasmon excitation, and served to preserve its existence after prolonged (five months) exposure to air, realizing the possibility of technological applications in plasmonic devices. The Ag NP and Ag@MgO NP film features in the SDR spectra could be reproduced by classical electrodynamics simulations by treating the NP-containing layer as an effective Maxwell Garnett medium. The simulations gave results in agreement with the experiments when accounting for the experimentally observed aggregation.
DescripciónThis is an Open Access article under the terms of the Creative Commons Attribution License.-- et al.
Versión del editorhttp://dx.doi.org/10.3762/bjnano.6.40
URIhttp://hdl.handle.net/10261/136477
DOI10.3762/bjnano.6.40
Identificadoresdoi: 10.3762/bjnano.6.40
e-issn: 2190-4286
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