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Assemblies of Semiconductor and Metal Nanoparticles for Renewable Energy

Published online by Cambridge University Press:  15 March 2011

Marie Zabel Markarian ,
Maysaa El-Harakeh ,
Rabieh Makki  and
Lara I. Halaoui
Marie Zabel Markarian
Affiliation:
Department of Chemistry, American University of Beirut, Beirut 110236, Lebanon
Maysaa El-Harakeh
Affiliation:
Department of Chemistry, American University of Beirut, Beirut 110236, Lebanon
Rabieh Makki
Affiliation:
Department of Chemistry, American University of Beirut, Beirut 110236, Lebanon
Lara I. Halaoui*
Affiliation:
Department of Chemistry, American University of Beirut, Beirut 110236, Lebanon
*
*Corresponding author: [email protected]
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Abstract

Nanostructured electrodes were assembled layer-by-layer from polyacrylate-capped Pt nanoparticles (<d>=2.5 ± 0.6 nm) in a cationic polyelectrolyte. Cyclic voltammetry revealed hydrogen adsorption peaks at the modified nanoparticles characteristic of an activated polycrystalline Pt surface, with a negative shift in the peak potentials indicating a less facile electro-adsorption relative to the polycrystalline electrode, possibly due to nanoparticle surface modification. Current-voltage measurements at multilayers of Pt nanoparticles in polyelectrolytes indicated the feasibility of charge hopping between the particles embedded in the insulating matrix. Such feasibility was also evidenced in photoluminescence quenching of Q-CdS dots (<d>=3.6 ± 0.5 nm) assembled in polyelectrolytes upon inserting Pt nanoparticles in the architecture.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 822: Symposium S – Nanostructured Materials in Alternative Energy Devices , 2004 , S8.8
Copyright
Copyright © Materials Research Society 2004

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