Plasmonic response of DNA-assembled gold nanorods: effect of DNA linker length, temperature and linker/nanoparticles ratio

Stephanie Vial; Dmytro Nykypanchuk; Francis Leonard Deepak; Marta Prado; Oleg Gang

doi:10.1016/j.jcis.2014.07.020

Plasmonic response of DNA-assembled gold nanorods: effect of DNA linker length, temperature and linker/nanoparticles ratio

J Colloid Interface Sci. 2014 Nov 1:433:34-42. doi: 10.1016/j.jcis.2014.07.020. Epub 2014 Jul 21.

Authors

Stephanie Vial¹, Dmytro Nykypanchuk², Francis Leonard Deepak³, Marta Prado⁴, Oleg Gang⁵

Affiliations

¹ International Iberian Nanotechnology Laboratory, Avenida Mestre Jose Veiga s/n, 4715-330 Braga, Portugal. Electronic address: stephanie.vial@dep.uminho.pt.
² Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, United States. Electronic address: dnykypan@bnl.gov.
³ International Iberian Nanotechnology Laboratory, Avenida Mestre Jose Veiga s/n, 4715-330 Braga, Portugal. Electronic address: leonard.francis@inl.int.
⁴ International Iberian Nanotechnology Laboratory, Avenida Mestre Jose Veiga s/n, 4715-330 Braga, Portugal. Electronic address: marta.prado@inl.int.
⁵ Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, United States. Electronic address: ogang@bnl.gov.

PMID: 25112910
DOI: 10.1016/j.jcis.2014.07.020

Abstract

Optical properties of gold nanorod (AuNR) particles self-assembled with DNA are systematically investigated. The particles assembly is driven by specific base-pair recognition between single strand (ss) DNA linker and DNA anchored to AuNRs, and it results in the distance- and morphology-dependent plasmonic coupling of AuNRs. The longitudinal plasmon band is distinctly affected by tuning the length of DNA linker, the temperature and linker/AuNRs ratio. We observed that the increase of temperature enhances the interparticle interactions and leads to clear distinguishable plasmonic signals between linker lengths up to 100 bases. Both absorbance decrease and shift of the longitudinal plasmon allow for use of AuNR for the DNA sensing applications.

Keywords: DNA; Gold nanorod; Plasmon coupling; Self-assembly.

Publication types

Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

DNA, Single-Stranded / chemistry*
Gold / chemistry*
Nanotubes / chemistry*
Surface Plasmon Resonance*

Substances

DNA, Single-Stranded
Gold