Tuning and tracking the growth of gold nanoparticles synthesized using binary surfactant mixtures

Karthik Raghunathan; Jibin Antony; Sarmad Munir; Jens-Petter Andreassen; Sulalit Bandyopadhyay

doi:10.1039/D0NA00214C

Tuning and tracking the growth of gold nanoparticles synthesized using binary surfactant mixtures†

Karthik Raghunathan,‡^a Jibin Antony,‡^b Sarmad Munir,^c Jens-Petter Andreassen^b and Sulalit Bandyopadhyay

*^b

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* Corresponding authors

^a Ugelstad Laboratory, Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim, Norway

^b Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim, Norway
E-mail: sulalit.bandyopadhyay@ntnu.no

^c Yara International ASA, Herøya Research Park, Hydrovegen 67, Porsgrunn, Norway

Abstract

Synthesis of gold nanorods (Au NRs) using surfactant-mediated seeded growth involves the interplay of parameters such as pH, reducing agent, and surfactant among others. The use of binary surfactant mixtures of cetyltrimethylammonium bromide (CTAB) and oleic acid (OA) has been reported by our group previously to obtain other anisotropic shapes. However, there are no reports investigating the growth kinetics and mechanisms of such shapes. Here, we report for the first time a ternary representation for compact visualization of shape transitions of gold nanoparticles (Au NPs) as a function of reaction parameters. Further, using UV-Vis spectrophotometry, the growth kinetics of these shapes was tracked using an in-house developed technique. The interplay between the experimental parameters and the properties of Au NPs was investigated using statistical analysis which showed that the reducing agent and pH were significant in influencing shape and growth kinetics. We further propose a growth mechanism in which the supersaturation of growth units controls the final shapes obtained.

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DOI: https://doi.org/10.1039/D0NA00214C
Article type: Paper
Submitted: 10 Dec 2019
Accepted: 24 Mar 2020
First published: 25 Mar 2020
This article is Open Access

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Nanoscale Adv., 2020,2, 1980-1992

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Tuning and tracking the growth of gold nanoparticles synthesized using binary surfactant mixtures

K. Raghunathan, J. Antony, S. Munir, J. Andreassen and S. Bandyopadhyay, Nanoscale Adv., 2020, 2, 1980 DOI: 10.1039/D0NA00214C

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

Nanoscale Advances

Tuning and tracking the growth of gold nanoparticles synthesized using binary surfactant mixtures†

Abstract

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Tuning and tracking the growth of gold nanoparticles synthesized using binary surfactant mixtures

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