Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/64822
Título: | Preparation of plasmonic Au-TiO2 thin films on a transparent polymer substrate |
Autor(es): | Rodrigues, Marco S. Meira, Diana I. Lopes, Cláudia Borges, Joel Vaz, F. |
Palavras-chave: | thin films reactive magnetron sputtering gold nanoparticles titanium dioxide poly(dimethylsiloxane) substrate localized surface plasmon resonance |
Data: | 2-Mar-2020 |
Editora: | Multidisciplinary Digital Publishing Institute |
Revista: | Coatings |
Citação: | 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. |
Resumo(s): | In this work, plasmonic thin films composed of Au nanoparticles embedded in a TiO<sub>2</sub> 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 TiO<sub>2</sub> 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 (H<sub>2</sub>O 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-TiO<sub>2</sub> thin films in transparent polymer substrates such as PDMS, the base material to develop microfluidic channels to be incorporated in LSPR sensing systems. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/64822 |
DOI: | 10.3390/coatings10030227 |
e-ISSN: | 2079-6412 |
Versão da editora: | https://www.mdpi.com/2079-6412/10/3/227 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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coatings-10-00227-v2.pdf | 2,04 MB | Adobe PDF | Ver/Abrir |
Este trabalho está licenciado sob uma Licença Creative Commons