A new plasmonic device made of gold nanoparticles and temperature responsive polymer brush on a silicon substrate

J Colloid Interface Sci. 2015 Jun 15;448:215-21. doi: 10.1016/j.jcis.2015.02.027. Epub 2015 Feb 17.

Abstract

This paper reports a general stepwise route assembling interface-mediated RAFT polymerization of 2-methoxyethoxy ethyl methacrylate and conversion of dodecyl trithiocarbonate end groups to thiol groups for gold nanoparticle assemblies. We intended by this way a new plasmonic device made of gold nanoparticles (Au NPs) and temperature responsive [poly((2-methoxyethoxy)ethyl) methacrylate] [poly(MEO2-MA)] brush on a silicon substrate. This polymeric layer replies to temperature changing by conformational variation and is therefore able to change the distance between the Au NPs on the brush layer with 5,5-dithiobis(2-dinitrobenzoic acid) (DTNB). We show that an increment of the external temperature reversibly stimulates a significant increase of the DTNB SERS signal.

Keywords: Gold nanoparticle; Phase transition temperature; Plasmonic device; Surface-enhanced Raman spectroscopy; Temperature-responsive polymer brushes.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Gold / chemistry*
  • Metal Nanoparticles / chemistry*
  • Metal Nanoparticles / ultrastructure
  • Methacrylates / chemistry*
  • Nitrobenzoates / chemistry
  • Silicon / chemistry*
  • Spectrum Analysis, Raman / methods*
  • Surface Properties
  • Temperature
  • Transition Temperature

Substances

  • Methacrylates
  • Nitrobenzoates
  • poly(2-(2-methoxyethoxy)ethyl methacrylate)
  • 2,4-dinitrobenzoic acid
  • Gold
  • Silicon