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Precisely Tailor the Longitudinal Localized Surface Plasmon Resonance of Gold Nanorods by Mild Oxidation with NaNO 2
Author(s) -
Jia Yanghui,
Xiong Bin,
Xu Dong,
Yeung Edward S.,
He Yan
Publication year - 2015
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201400172
Subject(s) - nanorod , surface plasmon resonance , chemistry , wavelength , plasmon , nanotechnology , nanoparticle , nano , kinetics , resonance (particle physics) , nanostructure , chemical engineering , optoelectronics , materials science , physics , particle physics , quantum mechanics , engineering
In this work, we introduce a new method to precisely tailor the longitudinal localized surface plasmon resonance (LLSPR) wavelengths of gold nanorods (GNRs) through the use of NaNO 2 as the oxidant. The effects of the concentrations of NaNO 2 , NH 4 Br and HCl on the reaction kinetics were investigated separately. To prepare GNRs with desired LLSPR wavelengths, equations were derived and were proved to be able to guide the tailoring of the LLSPR wavelengths through carefully tuning either the amount of NaNO 2 or the reaction time. TEM characterizations performed on two representative sets of GNRs show that the GNRs obtained exhibited shortened lengths but unchanged diameter with good monodispersity. In particular, GNRs with targeted LLSPR at 800 nm, 750 nm, 700 nm and 650 nm were successfully synthesized with relative errors of only 1 %∼5 %. This method shall promote more applications of GNRs and may advance the synthesis of other metal nanoparticles.