Nanoshells made easy: improving Au layer growth on nanoparticle surfaces.
The growth of a continuous, uniform Au layer on a dielectric nanoparticle is the critical step in the synthesis of nanoparticles such as nanoshells or nanorice, giving rise to their unique geometry-dependent plasmon resonant properties. Here, we report a novel, streamlined method for Au layer metallization on prepared nanoparticle surfaces using carbon monoxide as the reducing agent. This approach consistently yields plasmonic nanoparticles with highly regular shell layers and is immune to variations in precursor or reagent preparation. Single particle spectroscopy combined with scanning electron microscopy reveal that thinner, more uniform shell layers with correspondingly red-shifted optical resonances are achievable with this approach.
Department of Electrical Engineering, Rice University, Houston, Texas 77005, USA.
Bruce E
BE
Brinson
J Britt
JB
Lassiter
Carly S
CS
Levin
Rizia
R
Bardhan
Nikolay
N
Mirin
Naomi J
NJ
Halas
D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D008855:Microscopy, Electron, Scanning; D020349:Surface Plasmon Resonance; D013499:Surface Properties
D006046:Gold