A5064970528- Gold and Silver Nanoparticles Synthesis and Applications
- Nanocluster Synthesis and Applications
- Plasmonic and Surface Plasmon Research
- Quantum Dots Synthesis And Properties
- Advanced biosensing and bioanalysis techniques
- Biosensors and Analytical Detection
- Laser-Ablation Synthesis of Nanoparticles
- Nanoparticle-Based Drug Delivery
- Nanomaterials for catalytic reactions
- Advanced Electron Microscopy Techniques and Applications
- Nanoparticles: synthesis and applications
- Pickering emulsions and particle stabilization
- Electron and X-Ray Spectroscopy Techniques
- Photonic Crystals and Applications
- Copper-based nanomaterials and applications
- nanoparticles nucleation surface interactions
- Iron oxide chemistry and applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Polymer Surface Interaction Studies
- Advanced Nanomaterials in Catalysis
- Nanoplatforms for cancer theranostics
- Nonlinear Optical Materials Studies
- Mesoporous Materials and Catalysis
- Molecular Junctions and Nanostructures
- Metamaterials and Metasurfaces Applications
Ikerbasque
2016-2025
CIC biomaGUNE
2016-2025
Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine
2016-2025
Boeing (Spain)
2025
Digital Research Alliance of Canada
2020-2025
Universidade de Vigo
2013-2025
Soochow University
2023-2025
Centro de Investigación Biomédica en Red
2016-2024
Iberdrola (Spain)
2023
Ayuntamiento de San Sebastián
2016-2021
The discovery of the enhancement Raman scattering by molecules adsorbed on nanostructured metal surfaces is a landmark in history spectroscopic and analytical techniques. Significant experimental theoretical effort has been directed toward understanding surface-enhanced (SERS) effect demonstrating its potential various types ultrasensitive sensing applications wide variety fields. In 45 years since discovery, SERS blossomed into rich area research technology, but additional efforts are still...
Gold colloids have been homogeneously coated with silica using the silane coupling agent (3-aminopropyl)trimethoxysilane as a primer to render gold surface vitreophilic. After formation of thin layer in aqueous solution, particles can be transferred into ethanol for further growth Stöber method. The thickness completely controlled, and (after modification) practically any solvent. Varying shell refractive index solvent allows control over optical properties dispersions. spectra are good...
Metal nanoparticles can be used as building blocks for the formation of nanostructured materials. For design materials with specific (optical) properties, several approaches followed, even when starting from very same basic units. In this article, a survey is provided optical properties noble metal nanoparticles, specifically gold, silver, and their combinations, prepared in solution through colloid chemical methods. The are shown to mainly influenced by surface plasmon resonance conduction...
Wet chemistry in organic solvents has proven highly efficient for the preparation of several types metallic, metal-oxide, and semiconductor nanostructures. This Short Review focuses on use oleylamine (OAm) as a versatile reagent synthesis various nanoparticle systems. We describe ability OAm to act surfactant, solvent, reducing agent, function other parameters. also discuss specific role either alone or combination with reactants, form nanostructures using variety inorganic compounds...
Multipod Au nanoparticles (nanostars) with single crystalline tips were synthesized in extremely high yield through the reduction of HAuCl4 a concentrated solution poly(vinylpyrrolidone) (PVP) N,N-dimethylformamide (DMF), presence preformed nanoparticle seeds, but no need for external energy sources. Nanostar dispersions display well-defined optical response, which was found (through theoretical modeling) to comprise main mode confined within and secondary central body. Calculations surface...
Polygonal (mainly triangular) silver nanoprisms were synthesized by boiling AgNO3 in N,N-dimethyl formamide, the presence of poly(vinylpyrrolidone). Although during synthesis, a mixture and nanospheroids is formed, latter can be removed through careful centrifugation. The UV−visible spectra display an intense in-plane dipolar plasmon resonance band, as well weak bands for out-of-plane quadrupolar resonances. are also stable other solvents, such ethanol water, solvent exchange leads to strong...
Abstract The factors affecting the nucleation and growth of gold nanorods, (Jana et al., Adv. Mater. 2001 , 13 1389) have been investigated. It is shown that size aspect ratio can be controlled through use different sized seed particles. length rods tuned from 25–170 nm, while width remains almost constant at 22–25 nm. formation requires presence cationic surfactant cetyltrimethylammonium bromide (CTAB). Lower temperature favors rod formation, although this reduces CTAB solubility. addition...
Poly(vinylpyrrolidone) (PVP) is a polymer capable of complexing and stabilizing Ag Au nanoparticles formed through the reduction Ag+ or AuCl4- ions with N,N-dimethylformamide. The can be efficiently performed both at reflux under microwave irradiation, but each these methods leads to different nanoparticle morphology colloid stability. use irradiation provides an extra degree control process. PVP chain lengths particles similar sizes though colloids are also stable in ethanol for months,...
Homogeneous films of Au@SiO2 particles have been deposited on glass as a prototype 3D "artificial solid" using the LBL method. The film thickness is controlled by number dipping cycles and measured AFM. Each cycle results in approximately one monolayer being deposited. particle are dense, but disordered. optical properties resulting thin analyzed function volume fraction, which through silica shell thickness. We find that surface plasmon peak position with fractions up to φ > 0.5 accurately...
SERS permits identifying the nature of molecules in extremely low concentrations, but it is hindered by poor enhancement or reproducibility. We demonstrate controllable ∼1010 signal amplification reaching zeptomol detection limit for a nonresonant molecule sandwiching analyte between tips star-shaped gold nanoparticles and planar surface using simple synthetic procedure. This unprecedented control over light-intensity opens new avenue toward high-yield, fully reproducible, SERS-based, holds...
Au nanotriangles display interesting nanoplasmonic features with potential application in various fields. However, such applications have been hindered by the lack of efficient synthetic methods yielding sufficient size and shape monodispersity, as well insufficient morphological stability. We present here a synthesis purification protocol that efficiently addresses these issues. The can be tuned within wide range simply changing experimental parameters. obtained monodispersity leads to...
The reduction of Ag+ ions in N,N-dimethylformamide (DMF) is shown to take place spontaneously at room temperature. When no other additives are present the system, slow leads silver deposition on glass walls container, while presence 3-aminopropyltrimethoxysilane (APS) stable dispersions nanoparticles obtained. Even though can be performed temperature, higher temperatures markedly increase reaction rate and improve monodispersity colloid. morphology colloidal particles also depend ratio...
Gold nanostars are multibranched nanoparticles with sharp tips, which display extremely interesting plasmonic properties but require optimization. We present a systematic investigation of the influence different parameters on size, morphology, and monodispersity Au obtained via seeded growth in concentrated solutions poly(vinylpyrrolidone) N,N-dimethylformamide. Controlled prereduction Au(3+) to Au(+) was found (narrower plasmon bands), while [HAuCl(4)]/[seed] molar ratio significantly...
ADVERTISEMENT RETURN TO ISSUEPREVViewpointNEXTA "Tips and Tricks" Practical Guide to the Synthesis of Gold NanorodsLeonardo Scarabelli*†, Ana Sánchez-Iglesias†, Jorge Pérez-Juste‡, Luis M. Liz-Marzán*†§View Author Information† Bionanoplasmonics Laboratory, CIC biomaGUNE, Paseo de Miramon 182, 20009 Donostia-San Sebastian, Spain‡ Departamento Quı́mica Fı́sica, Universidade Vigo, 36310 Spain§ Ikerbasque, Basque Foundation for Science, 48013 Bilbao, Spain*E-mail: [email protected]...