Related Experiment Video
Updated: Jun 16, 2026
Gold Nanoparticle Synthesis
Published on: July 10, 2021
Drude relaxation rate in grained gold nanoantennas
Kuo-Ping Chen1, Vladimir P Drachev, Joshua D Borneman
1Birck Nanotechnology Center and School of Electrical and Computer Engineering, Purdue University, 1205 West State Street, West Lafayette, Indiana 47907, USA.
Abstract:
The effect of grain boundaries on the electron relaxation rate is significant even for large area noble metal films and more so for plasmonic nanostructures. Optical spectroscopy and X-ray diffraction show a substantial improvement in plasmon resonance quality for square-particle nanoantennas after annealing due to an enlarged grain size from 22 to 40 nm and improved grain boundaries described by the electron reflection coefficient. The electron relaxation rate due to the grains is shown to decrease by a factor of 3.2.
