Pallares, RM;
Su, X;
Lim, SH;
Thanh, NTK;
Fine-Tuning Gold Nanorods Dimensions and Plasmonic Properties Using the Hofmeister Salt Effects.
Journal of Material Chemistry C
, 4
pp. 53-61.
10.1039/C5TC02426A.
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Abstract
Gold nanorods (Au NRs) present unique optical and electronic properties that depend on their morphology. Their applications in sensing and therapeutics require easy synthesis with precise control over their dimensions. Here, we report a method for the synthesis of highly pure and monodisperse Au NRs with fine-tuneable dimensions and longitudinal localised surface plasmon resonance by addition of Hofmeister salts into the growth medium. The control of Au NR formation relies on the double interaction between salt–gold and salt–surfactant (cetyl trimethylammonium bromide, CTAB). With the addition of Hofmeister salts (i.e. NaNO3, NaBr, NaCl and NaHSO4) we can fine-tune the aspect ratio of Au NRs in the range of 3.3 to 4.8 with a precision of 0.1 and the longitudinal absorption band from 777 to 960 nm. In addition, we have studied the physical changes in the CTAB micelles induced by the salts using rheology, electron microscopy and light-scattering techniques. We report for the first time cryo-electron microscopy imaging of the micelles under Au NR growth conditions. With the comprehensive characterization of CTAB micelles in the growth solution, this study provides a deeper understanding of the anisotropic growth of metallic crystals.
Type: | Article |
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Title: | Fine-Tuning Gold Nanorods Dimensions and Plasmonic Properties Using the Hofmeister Salt Effects |
Identifier: | 10.1039/C5TC02426A |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1039/C5TC02426A |
Language: | English |
Additional information: | This journal is ©The Royal Society of Chemistry 2016. This Open Access Article is licensed under a Creative Commons Attribution 3.0 Unported Licence |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy UCL > Provost and Vice Provost Offices > VP: Research > Library Services |
URI: | https://discovery.ucl.ac.uk/id/eprint/1448055 |
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