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Issue 119, 2015
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Shape controlled synthesis of multi-branched gold nanocrystals through a facile one-pot bifunctional biomolecular approach

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Abstract

Anisotropic nanocrystals of gold and silver are promising candidates for sensing and therapeutic applications because of their high extinction coefficient, increased NIR response and localization of hot spots at their tips. Herein, we report a viable room temperature synthetic strategy to prepare multi-branched gold nanocrystals of varying morphologies without the aid of additional nanoseeds or shape directing agents. By systematically modulating the bifunctional ligand to the Au3+ ion molar ratio ([L-DOPA]/[HAuCl4] = 0.15–1), the plasmon absorption was tuned from visible (530 nm) to NIR (930 nm). The corresponding microscopic studies showed a gradual transformation of the nanomaterial's morphology from multiply twinned spheres to branched stars and flowers. The detailed spectroscopic and microscopic studies have revealed that evolution of these branched nanocrystals proceeds through aggregation and subsequent overgrowth of initially produced spherical particles.

Graphical abstract: Shape controlled synthesis of multi-branched gold nanocrystals through a facile one-pot bifunctional biomolecular approach

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Supplementary files

Article information


Submitted
16 Sep 2015
Accepted
04 Nov 2015
First published
09 Nov 2015

RSC Adv., 2015,5, 98318-98324
Article type
Paper
Author version available

Shape controlled synthesis of multi-branched gold nanocrystals through a facile one-pot bifunctional biomolecular approach

M. Sajitha, A. Vindhyasarumi, A. Gopi and K. Yoosaf, RSC Adv., 2015, 5, 98318 DOI: 10.1039/C5RA19098C

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