Reconfigurable Core−Satellite Nanoassemblies as Molecularly-Driven Plasmonic Switches

David S. Sebba†, Jack J. Mock‡, David R. Smith‡, Thomas H. LaBean§ and Anne A. Lazarides*†
Department of Mechanical Engineering and Materials Science, Department of Electrical and Computer Engineering, Department of Chemistry, and Department of Computer Science, Duke University, Durham, North Carolina 27708
Nano Lett., 2008, 8 (7), pp 1803–1808
DOI: 10.1021/nl080029h
Publication Date (Web): June 10, 2008
Copyright © 2008 American Chemical Society
†

Department of Mechanical Engineering and Materials Science.

,
‡

Department of Electrical and Computer Engineering.

,
§

Department of Chemistry and Department of Computer Science.

,
* Corresponding author. E-mail: anne.lazarides@duke.edu.

Abstract

Abstract Image

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.

View: Full Text HTML | Hi-Res PDF | PDF w/ Links

Tools

History

  • Published In Issue July 09, 2008
  • Article ASAPJune 10, 2008
  • Received: January 04, 2008
    Revised: May 16, 2008

Recommend & Share

Related Content

Other ACS content by these authors: