Issue 9, 2002
From the journal:

Journal of Materials Chemistry

Trialkylphosphine oxide/amine stabilised silver nanocrystals—the importance of steric factors and Lewis basicity in capping agents

Mark Green,*a   Nicholas Allsop,c   Gareth Wakefield,a   Peter J. Dobsonb  and  John L. Hutchisonc  

* Corresponding authors

a Oxonica Ltd, Begbroke Science and Business Park, Sandy Lane, Yarnton, Oxfordshire, UK
E-mail: mark.green@oxonica.com

b Department of Engineering Science, University of Oxford, Parks Road, Oxford, UK

c Department of Materials, University of Oxford, Parks Road, Oxford, UK

Abstract

The preparation of specifically passivated silver quantum dots is reported. Investigations into the surface-capping agents have highlighted the importance of both the chain length and bonding strength of the individual ligands. Capping agents traditionally utilised to stabilise semiconductor quantum dots cannot always be used to effectively passivate metal structures, and a dual surfactant system was chosen. Long chain amines, usually weakly binding to a bulk silver surface, were found to be effective passivating agents. The steric properties of weakly bound trialkylphosphine oxides also appear to affect the particle stability. The choice of capping agents highlight the importance of both the Lewis base functionality and steric factors and these may play a key part in the design of future nanostructured materials. It also emphasizes that effective capping agents for nanodispersed metals are not necessarily the optimum ligands for other systems such as semiconductors, metal oxides, etc.

Graphical abstract: Trialkylphosphine oxide/amine stabilised silver nanocrystals—the importance of steric factors and Lewis basicity in capping agents

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Article information

DOI
https://doi.org/10.1039/B203974E
Article type
Paper
Submitted
24 Apr 2002
Accepted
11 Jun 2002
First published
26 Jul 2002

J. Mater. Chem., 2002,12, 2671-2674

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Trialkylphosphine oxide/amine stabilised silver nanocrystals—the importance of steric factors and Lewis basicity in capping agents

M. Green, N. Allsop, G. Wakefield, P. J. Dobson and J. L. Hutchison, J. Mater. Chem., 2002, 12, 2671 DOI: 10.1039/B203974E

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