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Thin films composed of Ag nanoclusters dispersed in TiO2: Influence of composition and thermal annealing on the microstructure and physical responses
Czech Tech Univ, Fac Elect Engn, Dept Control Engn, Tech 2, CR-16635 Prague 6, Czech Republic..
Univ Minho, Ctr Fis, P-4710057 Braga, Portugal.;Inst Pedro Nunes, Lab Ensaios Desgaste & Mat, P-3030199 Coimbra, Portugal..
Univ Minho, Ctr Fis, P-4710057 Braga, Portugal..
Univ Minho, Ctr Fis, P-4710057 Braga, Portugal..
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2015 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 358, 595-604 p.Article in journal (Refereed) PublishedText
Abstract [en]

Noble metal powders containing gold and silver have been used for many centuries, providing different colours in the windows of the medieval cathedrals and in ancient Roman glasses. Nowadays, the interest in nanocomposite materials containing noble nanoparticles embedded in dielectric matrices is related with their potential use for a wide range of advanced technological applications. They have been proposed for environmental and biological sensing, tailoring colour of functional coatings, or for surface enhanced Raman spectroscopy. Most of these applications rely on the so-called localised surface plasmon resonance absorption, which is governed by the type of the noble metal nanoparticles, their distribution, size and shape and as well as of the dielectric characteristics of the host matrix. The aim of this work is to study the influence of the composition and thermal annealing on the morphological and structural changes of thin films composed of Ag metal clusters embedded in a dielectric TiO2 matrix. Since changes in size, shape and distribution of the clusters are fundamental parameters for tailoring the properties of plasmonic materials, a set of films with different Ag concentrations was prepared. The optical properties and the thermal behaviour of the films were correlated with the structural and morphological changes promoted by annealing. The films were deposited by DC magnetron sputtering and in order to promote the clustering of the Ag nanoparticles the as-deposited samples were subjected to an in-air annealing protocol. It was demonstrated that the clustering of metallic Ag affects the optical response spectrum and the thermal behaviour of the films.

Place, publisher, year, edition, pages
2015. Vol. 358, 595-604 p.
Keyword [en]
Thin films, Ag clusters dispersed in TiO2, Localised surface plasmon resonance, Thermal behavioura
National Category
Materials Engineering Condensed Matter Physics
URN: urn:nbn:se:uu:diva-272058DOI: 10.1016/j.apsusc.2015.08.148ISI: 000366220500013OAI: oai:DiVA.org:uu-272058DiVA: diva2:893482
9th International Conference on Materials Science and Engineering (BRAMAT), MAR 05-07, 2015, Transilvania Univ, Sergiu T Chiriacescu Aula, Brasov, ROMANIA
Available from: 2016-01-12 Created: 2016-01-11 Last updated: 2016-01-12Bibliographically approved

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Kubart, Tomas
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