Luminescent blinking of gold nanoparticles

Area of Science:

• Nanotechnology
• Materials Science
• Optics

Background:

• Gold nanoparticles are explored for various applications due to their unique optical properties.
• Luminescence in metallic nanoparticles is an area of active research with potential for novel devices.

Purpose of the Study:

• To investigate the luminescence properties of spin-coated gold colloids.
• To characterize the temporal and spectral behavior of the observed emission.
• To explore potential applications of gold nanoparticle luminescence.

Main Methods:

• Spin-coating of gold colloids onto a substrate.
• Illumination of the sample at 532 nm.
• Time-resolved emission spectroscopy.
• Spatial mapping of emission sources.

Main Results:

• Observed a time-dependent increase in emission intensity upon illumination.
• Emission originated from discrete, point-like locations exhibiting blinking behavior.
• Individual emission spots showed stable spectra and spatial positions, differing from silver nanoparticle behavior.
• The luminescence is attributed to gold clusters.

Conclusions:

• Gold colloids exhibit unique, stable luminescence from individual sites, distinct from silver nanoparticles.
• This luminescence suggests potential for gold clusters in nanophotonics devices.
• The findings indicate utility as luminescent probes for applications like medical imaging.