Gold Bipyramid Nanoparticle Dimers
journal contributionposted on 27.03.2014 by Edward W. Malachosky, Philippe Guyot-Sionnest
Any type of content formally published in an academic journal, usually following a peer-review process.
An aqueous synthesis of gold bipyramid dimers is presented. The methodology, its selectivity, and the characterization of the resulting structures with optical dark-field and scanning electron microscopy are presented and discussed. In the bowtie orientation, the dimers exhibit a 20% red shift in their plasmon resonance as compared to the individual particles, with a weak dependence on the interparticle separation. From the analysis, it was found that the in situ absorption peaks that develop during the assembly can be assigned to specific dimer structures, which has not been shown previously. Last, the kinetics of the assembly are analyzed.