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Twofold role of Hexadecyltrimethylammonium Bromide in photochemical synthesis of gold nanorods

Paper ID Volume ID Publish Year Pages File Format Full-Text
26112 43935 2015 9 PDF Available
Title
Twofold role of Hexadecyltrimethylammonium Bromide in photochemical synthesis of gold nanorods
Abstract

•We look into the role of Hexadecyltrimethylammonium Bromide on the nanorods growth.•Presence of gold chloride in the precursor solution causes nanoparticles formation.•We show only bromide complexes constitute gold precursor for the nanorods growth.•We expect stronger absorption energy of bromide complexes to facilitate anisotropy.•We succeed in synthesizing gold nanorods even using ineffective surfactant batches.

Synthesis of gold nanorods by photochemical reduction of gold precursor in cationic surfactant aqueous solution is studied in detail. The effect of concentration of cationic surfactant, Hexadecyltrimethylammonium Bromide, in the nanorods growth solution is examined and the optimum concentration for the synthesis estimated. Increase of the surfactant concentration, from the widely used 80 mM up to 160 mM, leads to considerable enhancement of the gold nanorods aspect ratio. The experimental results couple the improvements on the synthesis achieved increasing the surfactant concentration with the maximization of gold bromide complexes in the precursor solution. On the one hand dissociated bromide ions exchange with chloride stabilizes the gold against disproponation. So obtained strong gold bromide complexes play the role of gold precursor available for the photochemical process. On the other hand dissociated surfactant cations support the anisotropy of the growth through selective Hexadecyltrimethylammonium bilayer formation on AuNRs surfaces where bromide ions are preferentially adsorbed.

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Keywords
Gold nanorods; Hexadecyltrimethylammonium Bromide; Kinetics; Photochemical synthesis
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Twofold role of Hexadecyltrimethylammonium Bromide in photochemical synthesis of gold nanorods
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 311, 1 October 2015, Pages 76–84
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us