Journal ArticleDOI
Electron Tomography of Plasmonic Au Nanoparticles Dispersed in a TiO2 Dielectric Matrix.
Siddardha Koneti,Joel Nuno Pinto Borges,Lucian Roiban,Marcos Rodrigues,Nicolas Martin,Thierry Epicier,Filipe Vaz,Philippe Steyer +7 more
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TLDR
The goal was to assess the nanostructural characteristics and correlate them with the optical properties of the AuNPs, particularly the localized surface plasmon resonance (LSPR) behavior, and to provide the identification of "hot-spots".Abstract:
Plasmonic Au nanoparticles (AuNPs) embedded into a TiO2 dielectric matrix were analyzed by combining two-dimensional and three-dimensional electron microscopy techniques. The preparation method was reactive magnetron sputtering, followed by thermal annealing treatments at 400 and 600 °C. The goal was to assess the nanostructural characteristics and correlate them with the optical properties of the AuNPs, particularly the localized surface plasmon resonance (LSPR) behavior. High-angle annular dark field-scanning transmission electron microscopy results showed the presence of small-sized AuNPs (quantum size regime) in the as-deposited Au–TiO2 film, resulting in a negligible LSPR response. The in-vacuum thermal annealing at 400 °C induced the formation of intermediate-sized nanoparticles (NPs), in the range of 10–40 nm, which led to the appearance of a well-defined LSPR band, positioned at 636 nm. Electron tomography revealed that most of the NPs are small-sized and are embedded into the TiO2 matrix, whereas...read more
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Journal ArticleDOI
Development of label-free plasmonic Au-TiO2 thin film immunosensor devices
Ana I. Barbosa,Joel Nuno Pinto Borges,Diana Isabela Faria Meira,Diogo Emanuel Carvalho Costa,Marcos Rodrigues,Rita Rebelo,Vitor M. Correlo,Filipe Vaz,Rui L. Reis +8 more
TL;DR: Experimental results demonstrated the successful functionalization of the films' surface with antibodies, with the immobilization occurring preferentially in the exposed nanoparticles and negligibly on the TiO2 matrix, which demonstrates the suitability for the development of cost-effective, label-free LSPR based immunosensor devices.
Journal ArticleDOI
Nanocomposite thin films based on Au-Ag nanoparticles embedded in a CuO matrix for localized surface plasmon resonance sensing
Maria Manuela Carvalho Proença,Joel Nuno Pinto Borges,Joel Nuno Pinto Borges,Marcos Rodrigues,Diana Isabela Faria Meira,Paula Sampaio,João Paulo Dias,P. Pedrosa,P. Pedrosa,Nicolas Martin,Nenad Bundaleski,Orlando M. N. D. Teodoro,Filipe Vaz,Filipe Vaz +13 more
TL;DR: In this article, thin films composed of monometallic Au and Ag, and bimetallic Au Ag nanoparticles, dispersed in a CuO matrix were prepared, characterised and tested for Localized Surface Plasmon Resonance (LSPR) sensing.
Journal ArticleDOI
Gas Sensors Based on Localized Surface Plasmon Resonances: Synthesis of Oxide Films with Embedded Metal Nanoparticles, Theory and Simulation, and Sensitivity Enhancement Strategies
Marcos Rodrigues,Joel Nuno Pinto Borges,C. Lopes,Rui M. S. Pereira,Mikhail Vasilevskiy,Filipe Vaz +5 more
TL;DR: In this article, the Portuguese Foundation for Science and Technology (FCT) funded the research of Marco S. Rodrigues and his colleagues in the context of the Strategic Funding UIDB/04650/2020.
Journal ArticleDOI
Thin films of Au-Al2O3 for plasmonic sensing
Diana Isabela Faria Meira,R. P. Domingues,Marcos Rodrigues,Eduardo Alves,N.P. Barradas,Joel Nuno Pinto Borges,Filipe Vaz +6 more
TL;DR: In this paper, the development of nanoplasmonic thin films, composed of Au nanoparticles embedded in an Al2O3 matrix, was reported, and 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).
Journal ArticleDOI
Recent progress and challenges in plasmonic nanomaterials
TL;DR: A review of plasmonic nanomaterials (P-NMs) applications can be found in this article , where the authors summarize the current challenges and future developments in P-NM applications.
References
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Journal ArticleDOI
Computer Visualization of Three-Dimensional Image Data Using IMOD
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Journal ArticleDOI
3D Slicer as an image computing platform for the Quantitative Imaging Network.
Andriy Fedorov,Reinhard Beichel,Jayashree Kalpathy-Cramer,Julien Finet,Jean-Christophe Fillion-Robin,Sonia Pujol,Christian Bauer,Dominique Jennings,Fiona M. Fennessy,Milan Sonka,John M. Buatti,Stephen R. Aylward,James V. Miller,Steve Pieper,Ron Kikinis +14 more
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