Optical switching of coupled plasmons of Ag-nanoparticles by photoisomerisation of an azobenzene ligand

The optical switching of coupled plasmons of silver nanoparticles derivatised with a photoisomerisable azobenzene ligand is presented. It is shown that nanoparticle clusters, linked with an azobenzene dithiol molecule, display switchable optical properties. The photoisomerisation of the linker molec...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2007-01, Vol.9 (5), p.651-658
Main Authors: AHONEN, Päivi, SCHIFFRIN, David J, PAPROTNY, Jerzy, KONTTNRI, Kyösti
Format: Article
Language:English
Subjects:
Azo Compounds - chemical synthesis
Azo Compounds - chemistry
Azo Compounds - radiation effects
Chemistry
Colloidal state and disperse state
Energy Transfer
Exact sciences and technology
General and physical chemistry
Gold - chemistry
Isomerism
Ligands
Microscopy, Electron, Transmission - methods
Models, Molecular
Molecular Structure
Nanoparticles - chemistry
Optics and Photonics
Photochemistry
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Sensitivity and Specificity
Silver - chemistry
Spectrophotometry, Ultraviolet - methods
Surface Plasmon Resonance
Surface Properties
Ultraviolet Rays
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Summary:The optical switching of coupled plasmons of silver nanoparticles derivatised with a photoisomerisable azobenzene ligand is presented. It is shown that nanoparticle clusters, linked with an azobenzene dithiol molecule, display switchable optical properties. The photoisomerisation of the linker molecule was used to vary the separation between nanoparticles, which was monitored by changes in the UV-Vis-spectra of the plasmon band of adjacent nanoparticles. A red-shift due to the appearance of a coupled longitudinal plasmon band was observed resulting from the formation of nanoparticle clusters. The maximum absorbance wavelength of this secondary plasmon band was altered by isomerisation of the linker and the spectral changes observed were in good agreement with theory and earlier measurements for gold. Evidence of energy transfer between a nanoparticle and an azobenzene terminated monothiol attached to it was also observed in the UV-Vis spectra.
ISSN:1463-9076
1463-9084
DOI:10.1039/b615309g