4.8 Article

Ultrathin Layer-by-Layer Hydrogels with Incorporated Gold Nanorods as pH-Sensitive Optical Materials

期刊

CHEMISTRY OF MATERIALS
卷 20, 期 24, 页码 7474-7485

出版社

AMER CHEMICAL SOC
DOI: 10.1021/cm8023633

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资金

  1. NSF-CBET-NIRT [0650705]
  2. Air Force Office of Scientific Research [FA9550-08-01-0446]
  3. NSF CAREER Award [DMR-0547399]
  4. Robert A. Welch Foundation [C-1703]
  5. Alfred P. Sloan Foundation
  6. Directorate For Engineering
  7. Div Of Chem, Bioeng, Env, & Transp Sys [0650705] Funding Source: National Science Foundation

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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 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.

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