A5016736583- Gold and Silver Nanoparticles Synthesis and Applications
- Plasmonic and Surface Plasmon Research
- Biosensors and Analytical Detection
- Copper-based nanomaterials and applications
- ZnO doping and properties
- Advanced biosensing and bioanalysis techniques
- Gas Sensing Nanomaterials and Sensors
- Metal and Thin Film Mechanics
- Advanced Sensor and Energy Harvesting Materials
- Optical Coatings and Gratings
- Theoretical and Computational Physics
- Surface Roughness and Optical Measurements
- MXene and MAX Phase Materials
- Muscle activation and electromyography studies
- nanoparticles nucleation surface interactions
- Nonlinear Optical Materials Studies
- Photonic Crystals and Applications
- Analytical Chemistry and Sensors
- Advanced Nanomaterials in Catalysis
- Chalcogenide Semiconductor Thin Films
- GaN-based semiconductor devices and materials
- Ga2O3 and related materials
- Lubricants and Their Additives
- Laser-Ablation Synthesis of Nanoparticles
- Diamond and Carbon-based Materials Research
University of Minho
2014-2024
University of Aveiro
2022
Fundação para a Ciência e Tecnologia
2022
Universidade do Porto
2022
Centre for Health Technology and Services Research
2022
Universidade de Santiago de Compostela
2022
Instituto Pedro Nunes
2016
Laboratório de Ensaios Desgaste e Materiais
2014
This work presents a comprehensive review on gas sensors based localized surface plasmon resonance (LSPR) phenomenon, including the theory of LSPR, synthesis nanoparticle-embedded oxide thin films, and strategies to enhance sensitivity these optical sensors, supported by simulations electromagnetic properties. The LSPR phenomenon is known be responsible for unique colour effects observed in ancient Roman Lycurgus Cup at windows medieval cathedrals. In both cases, result from interaction...
Electrodes of silver/silver chloride (Ag/AgCl) are dominant in clinical settings for surface electromyography (sEMG) recordings. These electrodes need a conductive electrolyte gel to ensure proper performance, which dries during long-term measurements inhibiting the immediate electrode's reuse and is often linked skin irritation episodes. To overcome these drawbacks, new type dry based on architectured titanium (Ti) thin films were proposed this work. The microstructures zigzags, obtained...
In this work, a versatile method is proposed to increase the sensitivity of optical sensors based on localized surface plasmon resonance (LSPR) phenomenon. It combines physical deposition with oblique angle technique, allowing preparation plasmonic thin films tailored porosity. Thin Au-TiO2 were deposited by reactive magnetron sputtering in 3D nanostructure (zigzag growth), at different incidence angles (0° ≤ α 80°), followed in-air thermal annealing 400 °C induce growth Au nanoparticles....
Gas sensing based on bulk refractive index (RI) changes, has been a challenging task for localized surface plasmon resonance (LSPR) spectroscopy, presenting only limited number of reports in this field. In work, it is demonstrated that plasmonic thin film composed Au nanoparticles embedded CuO matrix can be used to detect small changes (as low as 6 × 10-5 RIU) RI gases at room temperature, using high-resolution LSPR spectroscopy system. To optimize the film's surface, simple Ar plasma...
The effect of Au nanoparticles' (NPs) concentration, size, and spatial distribution within a TiO2 dielectric matrix on the localized surface plasmon resonance (LSPR) band characteristics was experimentally theoretically studied. results analysis NPs' size distributions allowed us to conclude that isolated NPs grow only up 5 6 nm in even for highest annealing temperature used. However, higher volume fractions Au, coalescence closely located yields elongated clusters are much larger cause...
Thin films containing monometallic (Ag,Au) and bimetallic (Ag–Au) noble nanoparticles were dispersed in TiO2, using reactive magnetron sputtering post-deposition thermal annealing. The influence of metal concentration annealing the (micro)structural evolution was studied, its correlation with localized surface plasmon resonance (LSPR) enhanced Raman spectroscopy (SERS) behaviours evaluated. Ag/TiO2 presented columnar to granular microstructures, developing Ag clusters at for higher...
Carbon monoxide (CO) is a highly flammable and toxic gas to humans animals, that's why its detection monitoring are crucial. A promising technique develop robust cheap sensor, operating at room temperature, Localized Surface Plasmon Resonance (LSPR) sensing. However, LSPR sensing of inorganic molecules, such as CO, challenging due their extremely small differences in refractive indices. In this work, nanoplasmonic thin film, composed Au NPs semi-embedded CuO matrix (Au:CuO) was...
Optical biosensors based on localized surface plasmon resonance (LSPR) are the future of label-free detection methods. This work reports development plasmonic thin films, containing Au nanoparticles dispersed in a TiO2 matrix, as platforms for LSPR biosensors. Post-deposition treatments were employed, namely annealing at 400 °C, to develop an band, and Ar plasma, improve sensitivity Au-TiO2 film. Streptavidin biotin conjugated with horseradish peroxidase (HRP) chosen model receptor-analyte,...
Currently, there is an increasing need to develop highly sensitive plasmonic sensors able provide good biocompatibility, flexibility, and optical stability detect low levels of analytes in biological media. In this study, gold nanoparticles (Au NPs) were dispersed into chitosan membranes by spin coating. It has been demonstrated that these are particularly stable can be successfully employed as versatile platforms for molecular sensing. The response the chitosan/Au NPs interfaces their...
Abstract This work reports on the influence of nanoparticle (NP) size distribution and chemical nature gold (Au) and/or silver (Ag) NPs in localized surface plasmon resonance (LSPR) responses. The were produced embedded a titanium dioxide (TiO 2 ) thin film, deposited by reactive magnetron sputtering technique followed in-vacuum thermal treatment at 400 °C. High-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) gave quantitative key information terms both noble...
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 thermal annealing treatments at 400 600 °C. goal to assess the nanostructural characteristics correlate them with optical properties of AuNPs, particularly localized surface plasmon resonance (LSPR) behavior. High-angle annular dark field-scanning...
Thin films containing metal (gold, silver, etc.) nanoparticles are important platforms for molecular sensing based on the localized surface plasmon resonance (LSPR) phenomenon. To support their use in high-resolution LSPR spectroscopy systems, a software package, called NANOPTICS, was developed. It performs statistical analysis of band films, employing central moments normalized spectral distribution optical transmittance. parameters, signal-to-noise ratio and refractive index sensitivity...