Tunable plasmonic resonance of gallium nanoparticles by thermal oxidation at low temperatures
EntityUAM. Departamento de Física Aplicada
10.1088/1361-6528/aa8505Nanotechnology 28.40 (2017): 405705
ISSN0957-4484 (print); 1361-6528 (online)
Funded byThis research is supported by the MINECO (CTQ2014-53334-C2-2-R and MAT2016-80394-R) and Comunidad de Madrid (NANOAVANSENS ref. S2013/MIT-3029) projects. ARC acknowledges Ramón y Cajal program (under contract number RYC-2015-18047). FN acknowledges support from Marie Sklodowska-Curie grant agreement No 641899 from the European Union’s Horizon 2020 research and innovation programme
ProjectGobierno de España. CTQ2014-53334-C2-2-R; Gobierno de España. MAT2016-80394-R; Comunidad de Madrid. S2013/MIT-3029/NANOAVANSENS; info:eu-repo/grantAgreement/EC/H2020/641899/EU//PROMIS
SubjectsEllipsometry; Gallium; Nanoparticles; Oxidation; Plasmonics; Física
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Esta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
The effect of the oxidation of gallium nanoparticles (Ga NPs) on their plasmonic properties is investigated. Discrete dipole approximation has been used to study the wavelength of the out-of-plane localized surface plasmon resonance in hemispherical Ga NPs, deposited on silicon substrates, with oxide shell (Ga2O3) of different thickness. Thermal oxidation treatments, varying temperature and time, were carried out in order to increase experimentally the Ga2O3 shell thickness in the NPs. The optical, structural and chemical properties of the oxidized NPs have been studied by spectroscopic ellipsometry, scanning electron microscopy, grazing incidence x-ray diffraction and x-ray photoelectron spectroscopy. A clear redshift of the peak wavelength is observed, barely affecting the intensity of the plasmon resonance. A controllable increase of the Ga2O3 thickness as a consequence of the thermal annealing is achieved. In addition, simulations together with ellipsometry results have been used to determine the oxidation rate, whose kinetics is governed by a logarithmic dependence. These results support the tunable properties of the plasmon resonance wavelength in Ga NPs by thermal oxidation at low temperatures without significant reduction of the plasmon resonance intensity
Google Scholar:Catalán-Gómez, S. - Redondo-Cubero, A. - Palomares, F. J. - Nucciarelli, F. - Pau Vizcaíno, José Luis
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