A5030594220- Gold and Silver Nanoparticles Synthesis and Applications
- Plasmonic and Surface Plasmon Research
- Spectroscopy and Quantum Chemical Studies
- Ion-surface interactions and analysis
- Advanced biosensing and bioanalysis techniques
- Molecular Junctions and Nanostructures
- Nanoparticle-Based Drug Delivery
- Force Microscopy Techniques and Applications
- nanoparticles nucleation surface interactions
- Electrohydrodynamics and Fluid Dynamics
- Biosensors and Analytical Detection
Johannes Gutenberg University Mainz
2017-2020
Metallic nanoparticles show extraordinary strong light absorption near their plasmon resonance, orders of magnitude larger compared to nonmetallic nanoparticles. This "antenna" effect has recently been exploited transfer electrons into empty states an attached material, for example create electric currents in photovoltaic devices or induce chemical reactions. It is generally assumed that plasmons decay hot electrons, which then the material. Ultrafast electron-electron scattering reduces...
Damping of gold nanorod plasmons by surface-adsorbed molecules is best explained scattering off adsorbate-induced dipoles.
We present a study that allows us to explain the chemical changes behind often observed but so far ununderstood drift of plasmon resonance chemically prepared gold nanorods in microfluidic devices. systematically monitored evolution scattering signal from thousands single nanoparticles parallel, different nanorod batches, by both, silver-assisted and silver-free seeded growth. By varying experimental conditions, we confirmed presence silver surface layer for method. Although is initially...
Electron emission by femtosecond laser pulses from individual Au nanorods is studied with a time-of-flight momentum resolving photoemission electron microscope (ToF k-PEEM). The adhere to transparent indium–tin oxide substrate, allowing for illumination the rear side at normal incidence. Localized plasmon polaritons are resonantly excited 800 nm 100 fs long pulses. distribution of emitted electrons reveals two distinct mechanisms: coherent multiphoton process optically heated gas leads an...
The strong interactions between light and plasmons (in metal nanoparticles) allow to observe chemical physical processes on around the particle nanometer length scales as well they use for various applications. While electrodynamic theory predicts such effects very accurately, it is too complex intuitively connect underlying with observed changes. much simpler description of harmonically driven dipole antennas has already been successfully used describe many plasmonic effects. Here, these...