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

Päivi Ahonen, David J. Schiffrin, Jerzy Paprotny, Kyösti Kontturi

    Research output: Contribution to journalArticleScientificpeer-review

    43 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)651-658
    Number of pages8
    JournalPhysical Chemistry Chemical Physics
    Volume9
    Issue number5
    DOIs
    Publication statusPublished - 2007
    MoE publication typeA1 Journal article-refereed

    Keywords

    • GOLD NANOPARTICLES
    • METAL PARTICLES
    • MOLECULES
    • SURFACES
    • MAGNETIZATION
    • ISOMERIZATION
    • LUMINESCENCE
    • DISULFIDES
    • MONOLAYERS
    • CONSTANTS

    Fingerprint

    Dive into the research topics of 'Optical switching of coupled plasmons of Ag-nanoparticles by photoisomerisation of an azobenzene ligand'. Together they form a unique fingerprint.

    Cite this