Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/63221

TitleThin films of Au-Al2O3 for plasmonic sensing
Author(s)Meira, Diana Isabela Faria
Domingues, Rui P.
Rodrigues, Marco S.
Alves, Eduardo
Barradas, Nuno P.
Borges, Joel Nuno Pinto
Vaz, F.
KeywordsThin films
Magnetron sputtering
Localized surface plasmon resonance
Au nanoparticles
Al2O3 matrix
Plasmonic sensing
Al O matrix 2 3
Issue dateJan-2020
PublisherElsevier
JournalApplied Surface Science
CitationMeira, D. I., Domingues, R. P., Rodrigues, M. S., et. al.(2020). Thin films of Au-Al2O3 for plasmonic sensing. Applied Surface Science, 500, 144035.
Abstract(s)This works reports on the development of nanoplasmonic thin films, composed of Au nanoparticles embedded in an Al2O3 matrix. The Au-Al2O3 thin films were deposited by magnetron sputtering, and then subjected to thermal treatments (in-air) to promote the growth of the Au nanoparticles. The change of the number of gold pellets placed in the erosion zone of the aluminium target, originated Au concentrations in the films from 8.9 at.% to 20.7 at.%. While the Al2O3 matrix remained roughly stoichiometric and amorphous after the thermal treatment, a progressive crystallization of the Au nanoparticles was observed when the annealing temperature increased from 400 °C to 700 °C. Nonetheless, the amorphous matrix limited the growth of Au nanoparticles up to 20 nm. Moreover, the application of an argon plasma treatment enabled the removal of superficial layers, increasing the density of Au nanoparticles partially exposed at the films’ surface. Envisaging the application in localized surface plasmon resonance sensors, the thin films were tested using two dielectric (liquid) environments, showing a consistent response under different H2O/DMSO cycles, yet with low sensitivities (few nm/RIU). To enhance the sensitivity of these thin film system other strategies are discussed
TypeArticle
URIhttp://hdl.handle.net/1822/63221
DOI10.1016/j.apsusc.2019.144035
ISSN0169-4332
Publisher versionhttps://www.sciencedirect.com/science/article/pii/S016943321932851X
Peer-Reviewedyes
AccessRestricted access (UMinho)
Appears in Collections:CDF - GRF - Artigos/Papers (with refereeing)

Files in This Item:
File Description SizeFormat 
Thin films of AuAl2O3 for plasmonic sensing_1-s2.0-S016943321932851X-main.pdf
  Restricted access
Article3,24 MBAdobe PDFView/Open

This item is licensed under a Creative Commons License Creative Commons

Partilhe no FacebookPartilhe no TwitterPartilhe no DeliciousPartilhe no LinkedInPartilhe no DiggAdicionar ao Google BookmarksPartilhe no MySpacePartilhe no Orkut
Exporte no formato BibTex mendeley Exporte no formato Endnote Adicione ao seu ORCID