Anion effect on the shape evolution of gold nanoparticles during seed-induced growth in imidazolium-based ionic liquids

Heidrun A. Keul; Hyung Ju Ryu; Martin Möller; Michael R. Bockstaller

doi:10.1039/C1CP20518H

Anion effect on the shape evolution of gold nanoparticles during seed-induced growth in imidazolium-based ionic liquids

Heidrun A. Keul,^a Hyung Ju Ryu,^b Martin Möller^a and Michael R. Bockstaller*^b

* Corresponding authors

^a DWI e.V. and Institute of Technical and Macromolecular Chemistry, RWTH Aachen, Pauwelsstr. 8, D 52056 Aachen, Germany
Fax: +49 241 8023301
Tel: +49 241 8023300

^b Department of Materials Science and Engineering, Carnegie Mellon University, 5000 Forbes Ave., Pittsburgh, USA
E-mail: bockstaller@cmu.edu
Fax: +1 412 2687247
Tel: +1 412 2682709

Abstract

The relevance of anion structure on the shape regulating effect of 3-ethyl-1-methylimidazolium-based ionic liquids during the seed-induced growth of gold nanocrystals is evaluated for the particular case of lactate, acetate, methylsulfate, ethylsulfate and tosylsulfonate anion systems. Carboxylate-based anions (lactate and acetate) are found to inhibit the reduction of the gold precursor salt presumably due to the deprotonation of the reducing agent ascorbic acid. The formation of non-uniform, ‘head-tail’-type anisotropic particle structures is observed in both methyl- and ethylsulfate anion systems whereas rapid precipitation is observed in the case of tosylsulfonate anions. The particular efficiency of the ethylsulfate solvent system in promoting shape anisotropic growth is interpreted to be a consequence of both reduced anion/cation interactions that act to support the coordination of imidazolium to the metal surface and the enhanced capacity of anions to participate in the particle stabilization process.

This article is part of the themed collection: Nanostructures in Ionic Liquids

Article information

https://doi.org/10.1039/C1CP20518H

Article type

Paper

Submitted

26 Feb 2011

Accepted

23 Jun 2011

First published

12 Jul 2011

Download Citation

Phys. Chem. Chem. Phys., 2011,13, 13572-13578

Permissions

Request permissions

Anion effect on the shape evolution of gold nanoparticles during seed-induced growth in imidazolium-based ionic liquids

H. A. Keul, H. J. Ryu, M. Möller and M. R. Bockstaller, Phys. Chem. Chem. Phys., 2011, 13, 13572 DOI: 10.1039/C1CP20518H

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Physical Chemistry Chemical Physics

Anion effect on the shape evolution of gold nanoparticles during seed-induced growth in imidazolium-based ionic liquids

Abstract

Article information

Download Citation

Permissions

Anion effect on the shape evolution of gold nanoparticles during seed-induced growth in imidazolium-based ionic liquids

Social activity

Search articles by author

Spotlight

Advertisements