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Preparation and characterization of bimetallic core-shell nanoparticles

Cookson, Nikki Jade (2010)
M.Res. thesis, University of Birmingham.

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Abstract

New fields of research in chemistry and physics require improved synthetic techniques for colloidal metal particles. This work reports two novel techniques for synthesising bimetallic core-shell nanoparticles. The first technique is the chemical deposition of transition metal salts onto gold nanoparticle seeds. The transition metals used were platinum, palladium and rhodium. Gold nanoparticle seeds were produced using published methods. The gold nanoparticles were stabilised with either citrate or thiol-based stabilisers and the effects of the different stabilisers were studied. The gold nanoparticle seeds and the bimetallic core-shell nanoparticles were characterised using UV-vis spectroscopy, HAADF imaging, AFM imaging and with cyclic voltammetry. The citrate-stabilised gold nanoparticle seeds provided a better starting material for the bimetallic core-shell nanoparticles, however this route had problems with aggregation and morphology. The thiol-stabilised gold nanoparticles had a better morphology, but the thiol-stabilisation meant that it was difficult to coat the gold nanoparticles. The second technique studied was the use of galvanic replacement technique for producing bimetallic core-shell nanoparticles, which provides a novel and rapid technique for coating gold nanoparticle seeds with platinum. The Au(core)-Pd(shell) bimetallic nanoparticle system stabilised with citrate was the most successful of the three bimetallic systems studied, producing core-shell particles of approximately 5 nm in diameter.

Type of Work:M.Res. thesis.
Supervisor(s):Horswell, Sarah (Dr)
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:Department of Chemistry
Subjects:QD Chemistry
Institution:University of Birmingham
ID Code:572
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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