Reconfigurable core-satellite nanoassemblies as molecularly-driven plasmonic switches.
Molecular control of plasmon coupling is investigated in sub-100 nm assemblies composed of 13 nm gold "satellite" particles tethered by reconfigurable DNA nanostructures to a 50 nm gold "core" particle. Reconfiguration of the DNA nanostructures from a compact to an extended state results in blue shifting of the assembly plasmon resonance, indicating reduced interparticle coupling and lengthening of the core-satellite tether. Scattering spectra of the core-satellite assemblies before and after reconfiguration are compared with spectra calculated using a structural model that incorporates the core/satellite ratio determined by TEM imaging and estimates of tether length based upon prior measurements of interparticle separation in DNA linked nanoparticle networks. A strong correspondence between measured and simulated difference spectra validates the structural models that link the observed plasmon modulation with DNA nanostructure reconfiguration.
Sebba
David S
DS
Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina 27708, USA.
Mock
Jack J
JJ
Smith
David R
DR
Labean
Thomas H
TH
Lazarides
Anne A
AA
D001483:Base Sequence; D003198:Computer Simulation; D004247:DNA / Q000737:chemistry; D046529:Microscopy, Electron, Transmission; D008956:Models, Chemical; D008969:Molecular Sequence Data; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D013057:Spectrum Analysis; D020349:Surface Plasmon Resonance
D004247:DNA