jp412409u_si_001.pdf (1.2 MB)
Gold Bipyramid Nanoparticle Dimers
journal contribution
posted on 2014-03-27, 00:00 authored by Edward
W. Malachosky, Philippe Guyot-SionnestAn 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.