Au nanoparticles functionnalized by J-aggregates for highly efficient strong coupling applications

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The coupling of organic molecules and metallic nanostructures brings new opportunities to develop highly efficient photonic devices that combine the best features of those two specific materials. Indeed, the interactions between the electronic transitions of organic components and plasmon modes of noble metallic nanostructures are responsible of emerging mixed states thus creating new optical and electronic properties.1 Complex systems composed of the organic dyes and metal nanoparticles (NPs) are promising for building novel optoelectronic materials, photonics and sensors.2-4 Here, we present hybrid plasmonic composites made of gold spherical particles coated with a single monolayer J-aggregate of the cyanine dye 5,5’,6,6’-tetrachloro-1-1’-diethyl- 3,3’-di(4- sulfobuthyl)-benzimidazolocarbocyanine (TDBC). We have developed a facile synthetic route to prepare monodisperse Au@TDBC NPs allowing the direct and efficient coating of pretreated citrate-stabilized gold NPs with TDBC, without supplementary addition of salts or bases during the synthesis and carried out at room temperature. This simple preparation process is also reproducible allowing sufficient, high quality Au@TDBC NPs to be made for photonic applications. To the best of our knowledge, the only synthesis describing a coating of metallic NPs with TDBC is performed in exacting ice-cooled conditions.5 The size of gold particle is also tuned to optimize the strong coupling between the electronic transitions of organic components (TDBC) and the plasmon modes of gold NPs. A minimum wavelength separation of 61 nm has been calculated on the blue curve in figure 2 corresponding to a Rabi energy of 220meV. This value is higher than those evaluated in previous works for similar nanostructures.4,6

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Journal: TechConnect Briefs
Volume: 1, Nanotechnology 2010: Advanced Materials, CNTs, Particles, Films and Composites
Published: June 21, 2010
Pages: 399 - 402
Industry sector: Advanced Materials & Manufacturing
Topic: Nanoparticle Synthesis & Applications
ISBN: 978-1-4398-3401-5