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One‐Step High‐Yield Aqueous Synthesis of Size‐Tunable Multispiked Gold Nanoparticles
Author(s) -
Sau Tapan K.,
Rogach Andrey L.,
Döblinger Markus,
Feldmann Jochen
Publication year - 2011
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201100365
Subject(s) - nanoparticle , materials science , yield (engineering) , colloidal gold , surface plasmon resonance , nanotechnology , aqueous solution , plasmon , surface plasmon , transmission electron microscopy , surface modification , chemical engineering , chemistry , optoelectronics , composite material , engineering
Multispiked gold nanoparticles are required in large quantities for many fundamental studies and applications like (bio)sensing, but their preparation in high yield by the bottom‐up chemical synthetic method is challenging. A water‐based, non‐‘seed‐mediated’, straightforward method for the synthesis of gold nanoparticles with well‐developed surface spikes is reported here. The yield of multispiked gold particles is very high (>90%). The method allows the tuning of the number and size of the spikes and the overall size of the particles, and hence the localized surface plasmon resonances of the particles over the broad spectral range in the visible and near‐infrared. A mechanism for the evolution of twinned, sharp‐tipped surface protrusions has been proposed based on systematic spectrophotometric and transmission electron microscopic studies, which were employed to elucidate the morphological features, structure, chemical composition, and optical properties of the multispiked gold nanoparticles.