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Au thin films deposited on SnO2:In, In2O3:Sn, TiO2 and glass by sputtering: Substrate effects of thin film growth
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences. (Fasta tillståndets fysik)
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Thin Au films are promising transparent conductors with many potential application in green nanotechnology. These applications may require many different substrate materials, and hence a detailed understanding of the role of the substrate material on Au thin film growth is important. Such substrate effects have been studied in this work, where Au films ranging from island structures up to thin homogenous layers were deposited by DC magnetron sputtering onto glass substrates and onto SnO2:In, In2O3:Sn (ITO), and TiO2 layers on glass. Data were recorded by optical, electrical, structural and chemical analyses. We found a distinct difference in the Au growth depending on the properties of the substrates, and the results highlight the complexity of substrate impact on the growth. 

Keyword [en]
Transparent conductors, Au thin films, Sputter deposition, Electron microscopy, Substrate effect
National Category
Other Physics Topics
Research subject
URN: urn:nbn:se:uu:diva-179153OAI: oai:DiVA.org:uu-179153DiVA: diva2:543544
Available from: 2012-08-08 Created: 2012-08-08 Last updated: 2012-08-31
In thesis
1. Gold-Based Nanoparticles and Thin Films: Applications to Green Nanotechnology
Open this publication in new window or tab >>Gold-Based Nanoparticles and Thin Films: Applications to Green Nanotechnology
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The use of gold-based nanoparticles and thin films is very promising when it comes to improving several green nanotechnologies. Therefore, in order to further their use in applications such as electrochromic devices, photovoltaics, light-emitting diodes and photocatalysis, the aim of this work was to study the growth of gold-based nanoparticles and thin films.

All depositions were made using DC magnetron sputtering, and optical, structural, electrochemical, electrical and photocatalytic studies of the films and particles were performed.

The various applications yield a variety of substrate properties, and how these substrate properties affect gold coalescence was studied by depositing gold on glass slides and on SnO2:In, ITO and TiO2 base layers.

Temperature also affects the gold coalescence. Therefore, gold was deposited on heated and non-heated substrates, where the latter were also post-heated, with a temperature range between 25ºC and 140ºC in both cases. Various temperatures were also used for manufacturing gold nanoparticles, and their effect as photocatalytic improvers was tested on WO3 films.

The optical properties of Au films on glass were determined by ellipsometry in the 0.25 – 2 µm range, and then a spectral density analysis was performed of the effective dielectric permittivity.

This work showed that thin gold films are excellent replacements for oxide-based transparent conductors in electrochromic devices. It was also shown that thin homogeneous gold films were better conductors when they were deposited on glass, compared to when they were deposited on oxide base layers, regardless of the optical, electrical and structural properties, or the doping concentration of the base layers.

The results also showed that thin gold films were durable at 76ºC, and hence hold for a typical window temperature of ~70ºC. For higher temperatures, gold deposition on heated and non-heated substrates resulted in a distinct difference in growth, and there was also a distinct difference between post-heated gold films produced at 25ºC, compared to when the films were deposited on heated substrates. In the latter case, an island structure was obtained at 140ºC.

Spectral density analysis gave spectral densities of similar shape for nanoparticles and continuous gold films, which is useful information for further investigations.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2012. 100 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 950
green nanotechnology, transparent conductors, nanoparticles, gold coalescence, substrate effect, temperature effect
National Category
Nano Technology
Research subject
urn:nbn:se:uu:diva-179173 (URN)978-91-554-8420-0 (ISBN)
Public defence
2012-09-21, Häggsalen, Ångström laboratoriet, Lägerhyddsvägen 1, Uppsala, 09:30 (English)
Available from: 2012-08-30 Created: 2012-08-08 Last updated: 2013-01-22

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