Plasmonics

, Volume 9, Issue 4, pp 765–772

Gold Nanoring Arrays for Near Infrared Plasmonic Biosensing

  • Mana Toma
  • Kyunghee Cho
  • Jennifer B. Wood
  • Robert M. Corn
Article

DOI: 10.1007/s11468-013-9657-0

Cite this article as:
Toma, M., Cho, K., Wood, J.B. et al. Plasmonics (2014) 9: 765. doi:10.1007/s11468-013-9657-0

Abstract

Gold nanoring array surfaces that exhibit strong localized surface plasmon resonances (LSPR) at near infrared (NIR) wavelengths from 1.1 to 1.6 μm were used as highly sensitive real-time refractive index biosensors. Arrays of gold nanorings with tunable diameter, width, and spacing were created by the nanoscale electrodeposition of gold nanorings onto lithographically patterned nanohole array conductive surfaces over large areas (square centimeters). The bulk refractive index sensitivity of the gold nanoring arrays was determined to be up to 3,780 cm−1/refractive index unit by monitoring shifts in the LSPR peak by FT-NIR transmittance spectroscopy measurements. As a first application, the surface polymerization reaction of dopamine to form polydopamine thin films on the nanoring sensor surface from aqueous solution was monitored with the real-time LSPR peak shift measurements. To demonstrate the utility of the gold nanoring arrays for LSPR biosensing, the hybridization adsorption of DNA-functionalized gold nanoparticles onto complementary DNA-functionalized gold nanoring arrays was monitored. The adsorption of DNA-modified gold nanoparticles onto nanoring arrays modified with mixed DNA monolayers that contained only 0.5 % complementary DNA was also detected; this relative surface coverage corresponds to the detection of DNA by hybridization adsorption from a 50 pM solution.

Keywords

Gold nanorings Periodic nanoring arrays Localized surface plasmon resonance DNA biosensor Near infrared 

Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Mana Toma
    • 1
  • Kyunghee Cho
    • 1
  • Jennifer B. Wood
    • 1
  • Robert M. Corn
    • 1
  1. 1.Department of ChemistryUniversity of California—IrvineIrvineUSA

Personalised recommendations