Next Article in Journal
Thermoelastic Response Induced by Volumetric Absorption of Uniform Laser Radiation in a Half-Space
Previous Article in Journal
The Sealing Step in Aluminum Anodizing: A Focus on Sustainable Strategies for Enhancing Both Energy Efficiency and Corrosion Resistance
Open AccessFeature PaperArticle

Preparation of Plasmonic Au-TiO2 Thin Films on a Transparent Polymer Substrate

Centro de Física, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal
*
Author to whom correspondence should be addressed.
Coatings 2020, 10(3), 227; https://doi.org/10.3390/coatings10030227
Received: 29 January 2020 / Revised: 20 February 2020 / Accepted: 27 February 2020 / Published: 2 March 2020
In this work, plasmonic thin films composed of Au nanoparticles embedded in a TiO2 matrix were prepared in a transparent polymer substrate of poly(dimethylsiloxane) (PDMS). The thin films were deposited by reactive DC magnetron sputtering, and then subjected to heat treatment up to 150 °C in order to promote the growth of the Au nanoparticles throughout the TiO2 matrix. The transmittance spectrum of the thin films was monitored in situ during the heat treatment, and the minimum time required to have a defined localized surface plasmon resonance (LSPR) band was about 10 min. The average size of Au nanoparticles was estimated to be about 21 nm—the majority of them are sized in the range 10–40 nm, but also extend to larger sizes, with irregular shapes. The refractive index sensitivity of the films was estimated by using two test fluids (H2O and DMSO), and the average value reached in the assays was 37.3 ± 1.5 nm/RIU, resulting from an average shift of 5.4 ± 0.2 nm. The results show that it is possible to produce sensitive plasmonic Au-TiO2 thin films in transparent polymer substrates such as PDMS, the base material to develop microfluidic channels to be incorporated in LSPR sensing systems. View Full-Text
Keywords: thin films; reactive magnetron sputtering; gold nanoparticles; titanium dioxide; poly(dimethylsiloxane) substrate; localized surface plasmon resonance thin films; reactive magnetron sputtering; gold nanoparticles; titanium dioxide; poly(dimethylsiloxane) substrate; localized surface plasmon resonance
Show Figures

Figure 1

MDPI and ACS Style

Rodrigues, M.S.; Meira, D.I.; Lopes, C.; Borges, J.; Vaz, F. Preparation of Plasmonic Au-TiO2 Thin Films on a Transparent Polymer Substrate. Coatings 2020, 10, 227.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop