Journal
CHEMISTRY OF MATERIALS
Volume 20, Issue 24, Pages 7474-7485Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm8023633
Keywords
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Funding
- NSF-CBET-NIRT [0650705]
- Air Force Office of Scientific Research [FA9550-08-01-0446]
- NSF CAREER Award [DMR-0547399]
- Robert A. Welch Foundation [C-1703]
- Alfred P. Sloan Foundation
- Directorate For Engineering
- 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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