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Shape-controlled Synthesis of Silver and Palladium Nanocrystals using β-Cyclodextrin

Published online by Cambridge University Press:  21 May 2012

Gilles Berhault ,
Hafedh Kochkar  and
Abdelhamid Ghorbel
Gilles Berhault
Affiliation:
Institut de Recherches sur la Catalyse et l’Environnement (IRCELYON), CNRS – University Lyon I, Villeurbanne, France
Hafedh Kochkar
Affiliation:
Laboratoire de Chimie des Matériaux et Catalyse, University El Manar, Tunis, Tunisia
Abdelhamid Ghorbel
Affiliation:
Laboratoire de Chimie des Matériaux et Catalyse, University El Manar, Tunis, Tunisia
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Abstract

ABSTRACT

Shape-controlled Ag and Pd nanocrystals were synthesized using seed-mediated techniques using β-cyclodextrin (β-CD) as structuring agent. First, seeds were obtained by reacting Na2PdCl4 or AgNO3 with a strong reducing agent, NaBH4 in the presence of sodium citrate dihydrate acting as stabilizing agent. These seeds were then injected into a growth solution containing the same metallic precursor, ascorbic acid (as a weak reducing agent) and β-CD as structuring agent. TEM results emphasize a strong influence of the relative concentration of β-CD on the final morphology. In the case of silver, well-facetted nanocrystals were obtained with a progressive shift from kinetically to thermodynamically-controlled nanoobjects when increasing the β-CD/Ag molar ratio. On palladium, β-CD leads to the formation of dendrites (urchin-like) or multipods through controlled aggregation of primary particles. The use of β-CD does not interfere negatively with the catalytic properties of the Pd nanocrystals in the hydrogenation of cinnamaldehyde.

Keywords

AgPdnanostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1446: Symposium U – Materials for Catalysis in Energy , 2012 , mrss12-1446-u11-08
Copyright
Copyright © Materials Research Society 2012

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References

REFERENCES

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