Kinetically controlled growth of gold nanotriangles in a vesicular template phase by adding a strongly alternating polyampholyte

N Schulze,J Koetz

doi:10.1080/01932691.2016.1220318

N Schulze, J Koetz

Open Access

https://doi.org/10.1080/01932691.2016.1220318

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Abstract

ABSTRACTThis paper is focused on the temperature-dependent synthesis of gold nanotriangles in a vesicular template phase, containing phosphatidylcholine and AOT, by adding the strongly alternating polyampholyte PalPhBisCarb.UV-vis absorption spectra in combination with TEM micrographs show that flat gold nanoplatelets are formed predominantly in the presence of the polyampholyte at 45°C. The formation of triangular and hexagonal nanoplatelets can be directly influenced by the kinetic approach, i.e., by varying the polyampholyte dosage rate at 45°C. Corresponding zeta potential measurements indicate that a temperature-dependent adsorption of the polyampholyte on the {111} faces will induce the symmetry breaking effect, which is responsible for the kinetically controlled hindered vertical and preferred lateral growth of the nanoplatelets.

Highlights

IntroductionSize and shape control of gold nanoparticles has been the focus of a lot of investigations due to the size- and shape-dependent physicochemical and optical properties, which are of special interest in different fields of application, e.g., in photonics, catalysis, and biomedicine.[1]
Size and shape control of gold nanoparticles has been the focus of a lot of investigations due to the size- and shape-dependent physicochemical and optical properties, which are of special interest in different fields of application, e.g., in photonics, catalysis, and biomedicine.[1]Spherical gold nanoparticles are well known over a long time period, starting from the experiments of the alchemists in the 16th century up to now
When the gold precursor is titrated with the template phase in the presence of PalPhBisCarb at 45°C the formation of nanotriangles can be controlled by the dosage rate of the vesicular template phase

Summary

Introduction

Size and shape control of gold nanoparticles has been the focus of a lot of investigations due to the size- and shape-dependent physicochemical and optical properties, which are of special interest in different fields of application, e.g., in photonics, catalysis, and biomedicine.[1]. Spherical gold nanoparticles are well known over a long time period, starting from the experiments of the alchemists in the 16th century up to now. The mechanism of the gold nanoparticle formation via a nucleation process is well established, and the size of the spheres can be varied in a broad range from 2 up to 200 nm. The stability of gold nanoparticles stabilized by citric acid is limited and ultra-small

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