The role of the oxide shell in the chemical functionalization of plasmonic gallium nanoparticles
EntityUAM. Departamento de Física Aplicada; UAM. Departamento de Química Analítica y Análisis Instrumental
PublisherSociety of Photo-optical Instrumentation Engineers (SPIE)
10.1117/12.2265665Proceedings. of SPIE 10231 Optics + Optoelectronics. Edited by Francesco Baldini, Jiri Homola, Robert A. Lieberman;16 May 2017
ISSN0277-786X (print); 1996-756X (online)
SubjectsEllipsometry; Functionalization; Gallium; MCH.; Nanoparticles; Oxidation; Plasmonics; Física; Química
NoteS. Catalán-Gómez, M. Briones, A. Redondo-Cubero, F. J. Palomares, F. Nucciarelli, E. Lorenzo, J. L. Pau, "The role of the oxide shell in the chemical functionalization of plasmonic gallium nanoparticles", SPIE Optics + Optoelectronics Proc. SPIE 10231 (16 May 2017); doi: 10.1117/12.2265665; Copyright 2017 Society of Photo‑Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Rights© 2017 Society of Photo‑Optical Instrumentation Engineers.
Plasmonic Ga nanoparticles (NPs) were thermally oxidized at low temperature in order to increase the native Ga 2 O 3 shell thickness and to improve their stability during the chemical functionalization. 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 with the increasing annealing time due to the Ga 2 O 3 thickness increase, and barely affecting the intensity of the plasmon resonance. This oxide layer enhances the stability of the NPs upon immersion in ethanol or water. The surface sensitivity properties of the as-grown and oxidized NPs were investigated by linking a thiol group from 6-Mercapto-1-hexanol through immersion. Ellipsometric spectra at the reversal polarization handedness (RPH) condition are in agreement with the Langmuir absorption model, indicating the formation of a thiol monolayer on the NPs.
Google Scholar:Catalán-Gómez, S. - Briones, M. - Redondo-Cubero, A. - Palomares, F. J. - Nucciarelli, F. - Lorenzo, E. - Pau Vizcaíno, José Luis
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