Scalable Routes to Gold Nanoshells with Tunable Sizes and Response to Near-Infrared Pulsed-Laser Irradiation

A simplified synthesis of hollow gold nanoshells 20–50 nm in diameter via the well‐established templated galvanic replacement reaction of silver for gold is presented. The surface plasmon resonance absorbance of the nanoshells is tuned using basic colloid chemistry to control the size of the silver...

Full description

Saved in:
Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2008-08, Vol.4 (8), p.1183-1195
Main Authors: Prevo, Brian G., Esakoff, Shelley A., Mikhailovsky, Alexander, Zasadzinski, Joseph A.
Format: Article
Language:English
Subjects:
Chlorides
galvanic replacement reactions
gold
Gold - chemistry
Gold - radiation effects
Gold Compounds
Infrared Rays
Lasers
Metal Nanoparticles - chemistry
Metal Nanoparticles - radiation effects
Metal Nanoparticles - ultrastructure
nanoparticles
Scattering, Radiation
silver
Silver - chemistry
Spectrophotometry, Ultraviolet
Spectroscopy, Near-Infrared
Surface Plasmon Resonance
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A simplified synthesis of hollow gold nanoshells 20–50 nm in diameter via the well‐established templated galvanic replacement reaction of silver for gold is presented. The surface plasmon resonance absorbance of the nanoshells is tuned using basic colloid chemistry to control the size of the silver templates. The gold nanoshells have an aqueous core and are varied in size and shell thickness depending on the silver/gold reagent ratios. The template replacement chemistry is rapid, highly scalable, uses minimal amounts of toxic reagents, and in many cases is a true one‐pot synthesis. The smallest nanoshells (20‐nm diameter, 7‐nm wall thickness) reach the highest temperature on irradiation with femtosecond light pulses in the near infrared and anneal to form spherical nanoparticles fastest, even though their plasmon resonance does not overlap as well as the larger nanoshells (50‐nm diameter, 7‐nm wall thickness) with 800‐nm wavelength excitation. Good as gold: Gold nanoshells templated from silver nanoparticles can be tuned to absorb light over the visible to near‐infrared (see image) by simply increasing the diameter of the silver template. Samples are labeled with the maximum of the surface plasmon absorption wavelength.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.200701290