Optical properties of Au nanoparticles included in mesoporous TiO 2 thin films: A dual experimental and modeling study
Gold nanoparticles (NP) were synthesized inside ordered mesoporous TiO 2 thin films (MTTF) by stepwise reduction of AuCl4 - with NaBH4. This leads to an optical material (Au@TiO2) of interest for plasmonic applications. The films (pure titania or gold-titania nanocomposites) were thoroughly characte...
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todo:paper_19327447_v117_n14_p7246_Sanchez2023-10-03T16:35:55Z Optical properties of Au nanoparticles included in mesoporous TiO 2 thin films: A dual experimental and modeling study Sánchez, V.M. Martínez, E.D. Martínez Ricci, M.L. Troiani, H. Soler-Illia, G.J.A.A. Dielectric functions In-situ experiments Interparticle distances Metallic nanoparticles Multi-layered systems Ordered mesoporous Spatial localization UV-Visible spectra Dispersions Ellipsometry Gold alloys Nanocomposites Nanoparticles Optical properties Plasmons Thin films Titanium dioxide Gold Gold nanoparticles (NP) were synthesized inside ordered mesoporous TiO 2 thin films (MTTF) by stepwise reduction of AuCl4 - with NaBH4. This leads to an optical material (Au@TiO2) of interest for plasmonic applications. The films (pure titania or gold-titania nanocomposites) were thoroughly characterized by UV-visible and ellipsometry spectroscopies. The dielectric function of the MTTF, considered as the dielectric environment in which the NP are embedded, was acquired by ellipsometry and rationalized by the asymmetric Bruggeman model as an effective medium formed by the mixture of dense TiO2 and air. Nanocomposite Au@TiO2 systems present an isotropic dispersion of Au NP in the 5-8 nm range. The UV-visible spectra obtained with a low nanoparticle filling fraction of the pore volume (fNP < 2%) are accurately reproduced by both Maxwell-Garnett (MG) and Mie theories. Accurate and coincident values of fNP and NP size are obtained by this method. The dielectric function of Au NP used in this work was studied in detail; in particular, the interface damping parameter related to the NP/MTTF interface was determined by comparison with TEM microscopy. The potential of the ellipsometry technique to determine the material plasmonic response, and its correspondence with the UV-visible spectra, are discussed. This spectroscopy technique opens the possibility to study the plasmon response of the material to changes in the environment due to the presence of vapors, and other in situ experiments, as well as to provide nanostructural information of metallic nanoparticles (NP size, interparticle distance, number of NP) with well-defined spatial localization in a multilayered system. © 2013 American Chemical Society. Fil:Sánchez, V.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Martínez Ricci, M.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Soler-Illia, G.J.A.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_19327447_v117_n14_p7246_Sanchez |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Dielectric functions In-situ experiments Interparticle distances Metallic nanoparticles Multi-layered systems Ordered mesoporous Spatial localization UV-Visible spectra Dispersions Ellipsometry Gold alloys Nanocomposites Nanoparticles Optical properties Plasmons Thin films Titanium dioxide Gold |
| spellingShingle |
Dielectric functions In-situ experiments Interparticle distances Metallic nanoparticles Multi-layered systems Ordered mesoporous Spatial localization UV-Visible spectra Dispersions Ellipsometry Gold alloys Nanocomposites Nanoparticles Optical properties Plasmons Thin films Titanium dioxide Gold Sánchez, V.M. Martínez, E.D. Martínez Ricci, M.L. Troiani, H. Soler-Illia, G.J.A.A. Optical properties of Au nanoparticles included in mesoporous TiO 2 thin films: A dual experimental and modeling study |
| topic_facet |
Dielectric functions In-situ experiments Interparticle distances Metallic nanoparticles Multi-layered systems Ordered mesoporous Spatial localization UV-Visible spectra Dispersions Ellipsometry Gold alloys Nanocomposites Nanoparticles Optical properties Plasmons Thin films Titanium dioxide Gold |
| description |
Gold nanoparticles (NP) were synthesized inside ordered mesoporous TiO 2 thin films (MTTF) by stepwise reduction of AuCl4 - with NaBH4. This leads to an optical material (Au@TiO2) of interest for plasmonic applications. The films (pure titania or gold-titania nanocomposites) were thoroughly characterized by UV-visible and ellipsometry spectroscopies. The dielectric function of the MTTF, considered as the dielectric environment in which the NP are embedded, was acquired by ellipsometry and rationalized by the asymmetric Bruggeman model as an effective medium formed by the mixture of dense TiO2 and air. Nanocomposite Au@TiO2 systems present an isotropic dispersion of Au NP in the 5-8 nm range. The UV-visible spectra obtained with a low nanoparticle filling fraction of the pore volume (fNP < 2%) are accurately reproduced by both Maxwell-Garnett (MG) and Mie theories. Accurate and coincident values of fNP and NP size are obtained by this method. The dielectric function of Au NP used in this work was studied in detail; in particular, the interface damping parameter related to the NP/MTTF interface was determined by comparison with TEM microscopy. The potential of the ellipsometry technique to determine the material plasmonic response, and its correspondence with the UV-visible spectra, are discussed. This spectroscopy technique opens the possibility to study the plasmon response of the material to changes in the environment due to the presence of vapors, and other in situ experiments, as well as to provide nanostructural information of metallic nanoparticles (NP size, interparticle distance, number of NP) with well-defined spatial localization in a multilayered system. © 2013 American Chemical Society. |
| format |
JOUR |
| author |
Sánchez, V.M. Martínez, E.D. Martínez Ricci, M.L. Troiani, H. Soler-Illia, G.J.A.A. |
| author_facet |
Sánchez, V.M. Martínez, E.D. Martínez Ricci, M.L. Troiani, H. Soler-Illia, G.J.A.A. |
| author_sort |
Sánchez, V.M. |
| title |
Optical properties of Au nanoparticles included in mesoporous TiO 2 thin films: A dual experimental and modeling study |
| title_short |
Optical properties of Au nanoparticles included in mesoporous TiO 2 thin films: A dual experimental and modeling study |
| title_full |
Optical properties of Au nanoparticles included in mesoporous TiO 2 thin films: A dual experimental and modeling study |
| title_fullStr |
Optical properties of Au nanoparticles included in mesoporous TiO 2 thin films: A dual experimental and modeling study |
| title_full_unstemmed |
Optical properties of Au nanoparticles included in mesoporous TiO 2 thin films: A dual experimental and modeling study |
| title_sort |
optical properties of au nanoparticles included in mesoporous tio 2 thin films: a dual experimental and modeling study |
| url |
http://hdl.handle.net/20.500.12110/paper_19327447_v117_n14_p7246_Sanchez |
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1807322184084881408 |