Molecular-mediated assembly of silver nanoparticles with controlled interparticle spacing and chain length

In the present work, we report on a one-pot method for the assembly of noble metal nanoparticles with tunable optical properties, assembly length and interparticle spacing. The synthetic colloidal route is based on the covalent binding among OH-terminated silver nanoparticles by means of dicarboxyli...

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Bibliographic Details
Published in:Journal of materials chemistry 2012-11, Vol.22 (41), p.2224-22211
Main Authors: Abargues, Rafael, Albert, Sandra, Valdés, José L, Abderrafi, Kamal, Martínez-Pastor, Juan P
Format: Article
Language:English
Subjects:
Assembly
Correlation
Electronics
Joining
Nanoparticles
Noble metals
Plasmons
Silver
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Summary:In the present work, we report on a one-pot method for the assembly of noble metal nanoparticles with tunable optical properties, assembly length and interparticle spacing. The synthetic colloidal route is based on the covalent binding among OH-terminated silver nanoparticles by means of dicarboxylic acids with a defined molecular length. As a result, the initially symmetric plasmon band of silver nanoparticles splits into two plasmonic modes when nanoparticles are assembled due to the strong near-field plasmon coupling. We noticed a very good correlation between the plasmon wavelength shift and the interparticle spacing that is represented by the universal scaling law of the surface plasmon resonance in metal nanoparticle dimers. A relationship between the plasmon coupling and the assembly size (represented by the number of nanoparticles) for two different interparticle distances has been experimentally found. Such a correlation has revealed the additional effect of the electronic polarizability of the linker on the propagation of the plasmon coupling between NPs. In the present work, we report on a one-pot method for the assembly of noble metal nanoparticles with tunable optical properties, assembly length and interparticle spacing.
ISSN:0959-9428
1364-5501
DOI:10.1039/c2jm34707e