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ABSTRACT: Plasmon-enhanced luminescence was developed for luminescent oxygen sensor application. Luminescent polymer Langmuir-Blodgett films containing platinum-porphyrin were assembled plane-to-plane with a silver nanoparticle array. The hybrid polymer nanoassemblies allow more than 10-fold luminescence enhancement in air. The luminescence intensity and lifetime measurements as functions of the number of layers revealed that some platinum-porphyrin, which is close to silver nanoparticles, is effectively enhanced. The enhancement enables us to monitor 2D oxygen distribution mapping on the micrometer scale.
Langmuir 10/2010; 26(19):15117-20. · 4.19 Impact Factor
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ABSTRACT: This paper describes the fabrication of hybrid nanoassemblies with polymer brushes and gold nanoparticles enabling detection of nanoscale optical changes based on localized surface plasmon resonance. The reversible and thermosensitive nanoscale actuation is achieved by combining stimuli-responsive polymer brushes and gold nanoparticles independently and selectively assembled on substrates. These hybrid nanoassemblies are assembled on numerous substrates and will be applicable for optoelectronics, nanoactuator, and nanosensor applications.
Langmuir 08/2007; 23(14):7472-4. · 4.19 Impact Factor
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ABSTRACT: The paper describes fabrication of hybrid polymer nanoassemblies possessing polymer nanosheets and metal nanoparticle arrays. Based on a bottom-up approach with ultrathin polymer Langmuir-Blodgett films (polymer nanosheets) and metal nanoparticles, we constructed hybrid nanoassemblies for opto/electric nanodevice applications: nanoscale positioning of metal nanoparticles, free-standing hybrid polymer nanosheets, hybrid polymer nanoassemblies for luminescence sensor application, and enhancement of nonlinear optical (NLO) efficiency via surface plasmon coupling. Assembling nanomaterials such as nanoparticles and organic functional molecules through a bottom-up approach makes it possible to strengthen free-standing nanofilm stability, enhance luminescence of luminescent molecules, and enhance second harmonic light from NLO molecules under the influence of localized surface plasmons. The high potential of hybrid polymer nanoassemblies for precise nanoscale design is also demonstrated.Keywords: Polymer, LB Film, Metal Nanoparticle, Surface Plasmon, Hybrid
Polymer Journal 03/2007; 39(5):411-422. · 1.26 Impact Factor
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ABSTRACT: The article describes hybrid polymer nanoassemblies consisting of polymer nanosheets and metal nanoparticle arrays. Ultrathin polymer Langmuir-Blodgett films were utilized to assemble metal nanoparticles, to make free-standing hybrid polymer nanosheets, to examine the possibility of hybrid polymer nanoassemblies as luminescence sensor application, and to orient nonlinear optical (NLO) active molecules. Assembling nanomaterials such as nanoparticle and organic functional molecules through bottom-up approach make it possible to strengthen free-standing nanofilm stability, enhance luminescence from luminescent molecules and second harmonic light from NLO molecules under the influence of localized surface plasmon.
Molecular Crystals and Liquid Crystals. 01/2007; 471(August 15):11-19.
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ABSTRACT: This paper focuses on controlling adsorption of gold nanoparticles onto polymer nanosheets. Amphiphilic copolymers, poly(N-dodecyl acrylamide-co-4-vinyl pyridine)s (p(DDA/VPy)s), were synthesized and the ultrathin p(DDA/VPy) films were prepared by the Langmuir−Blodgett (LB) technique. Gold nanoparticles were immobilized onto p(DDA/VPy) LB films through the dipping method and took a uniformly distributed monolayer formation. The amount of gold nanopariticle in the monolayer strongly depended on the VPy content. A patterned gold nanoparticle monolayer was obtained with photopatterned p(DDA/VPy) LB films. These findings suggest that p(DDA/VPy) LB films act as a good template for gold nanoparticle arrays.
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