Ultrathin layer-by-layer hydrogels with incorporated gold nanorods as pH-sensitive optical materials

Academic Article

Abstract

  • We report ultrathin pH-responsive plasmonic membranes of [poly(methacrylic acid)-gold nanorods]20 (PMAA-Au NRs)20 with gold nanorods embedded into swollen cross-linked LbL hydrogels. In contrast to the most of known pH responsive materials which rely on pH-triggered change in the intensity of Photoluminescence or plasmon bands, the responsive structures suggested here exhibit a significant pH- triggered shift in easily detectable, strong plasmon resonance band. We show that a pH-induced deswelling of the (PMAA-Au NRs) 20 hydrogel film in the pH change from 8 to 5 causes a dramatic blue-shift of the longitudinal plasmon peak by 21 nm due to the increased side-by-side interactions of adjacent gold nanorods. These composite hydrogel multilayer films can be released from the substrates yielding free-floating and optically pH-responsive ultrathin hydrogel films which can be transferred to the appropriate solid substrates. © 2008 American Chemical Society.
  • Published In

    Digital Object Identifier (doi)

    Author List

  • Kozlovskaya V; Kharlampieva E; Khanal BP; Manna P; Zubarev ER; Tsukruk VV
  • Start Page

  • 7474
  • End Page

  • 7485
  • Volume

  • 20
  • Issue

  • 24