Herein, we report the variation of localized surface plasmon resonance (LSPR) of gold nanoparticle (NP) arrays covered by poly(3,4-ethylenedioxythiophene) (PEDOT) as a function of the electronic state of the polymer. Giant shifts and fine-tuning of the LSPR of gold NPs surrounded by PEDOT/sodium docecyl sulfate have been achieved. The color variations of plasmonic/conducting polymer (CP) devices are given not only by changes of the optical properties of the CP upon doping but also by a close synergy of the optical properties of CP and NP. Such systems can considerably extend the field of CP-based electrochromic devices.
"Tuning of the localized SPR spectrum associated with metal nanoparticles is also a key issue in applications of plasmonic devices (Jensen et al. 2000; Okamoto et al. 2013; Hsiao et al. 2008; Evans et al. 2007; Leroux et al. 2005; Leroux et al. 2008; Leroux et al 2009; Dintinger et al. 2006; Stockhausen et al. 2010; Yoshida et al. 2012). The localized SPR of metal nanoparticles is extremely sensitive to the particle size, composition, and dielectric constant of surrounding materials. "
[Show abstract][Hide abstract] ABSTRACT: Grating-coupled propagating surface plasmons associated with silver-nanoparticle 2D crystalline sheets exhibit sensitive plasmonic resonance tuning. Multilayered silver-nanoparticle 2D crystalline sheets are fabricated on gold or silver grating surfaces by the Langmuir– Blodgett method. We show that the deposition of Ag crystalline nanosheets on Au or Ag grating surfaces causes a drastic change in propagating surface plasmon resonance (SPR) both in angle measurements at fixed wavelengths and in fixed incident-angle mode by irradiation of white light. The dielectric constant of the multilayered silver nanosheet is estimated by a rigorous coupled-wave analysis. We find that the dielectric constant drastically increases as the number of silver-nanosheet layers increases. The experimentally obtained SP dispersions of Ag crystalline nanosheets on Au and Ag gratings are compared with the calculated SP dispersion curves. The drastic change in the surface plasmon resonance caused by the deposition of Ag-nanoparticle 2D crystalline sheets on metal grating surfaces suggests the potential for applications in highly sensitive sensors or for plasmonic devices requiring greatly enhanced electric fields.
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The online version of this article (doi:10.1186/2193-1801-3-284) contains supplementary material, which is available to authorized users.
[Show abstract][Hide abstract] ABSTRACT: In this paper, we report the preparation of highly stable gold nanoparticles/poly(3,4-ethylendioxythiophene) nanocomposites by a one-pot chemical route in aqueous medium without surfactants to increase the solubility of the monomer (3,4-ethylendioxythiophene, EDOT) or to stabilize gold nanoparticles (Au NPs). The generation of the nanocomposite was followed by UV–Visible transmission spectroscopy combined with multivariate curve resolution alternating least squares analysis to deconvolute the individual spectra of the different species generated in the synthesis: oligomers, polymer and gold nanoparticles. The plasmon band observed at 530 nm during the synthesis step indicates the generation of gold nanoparticles. The influence of monomer and metal precursor concentration and their concentration ratios on Au NP size were analyzed. The electrochromic properties of the composite were investigated by UV–Visible absorption spectroelectrochemistry, being mainly related to polymer oxidation and reduction. The main difference observed is the hypsochromic shift of the polymer spectra due to the gold nanoparticles inside the polymer. Multicyclic spectroelectrochemical experiments evidence a high stability and adhesion of the nanocomposite.
Journal of Nanoparticle Research 01/2012; 14(1). DOI:10.1007/s11051-011-0661-z · 2.18 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The direct electrochemistry of cytochrome c (Cyt c) embedded in a novel support matrix of graphene/poly (3,4-ethylenedioxythiophene) (G-PEDOT) nanocomposite on a glassy carbon electrode was studied. The prepared G-PEDOT nanocomposite is of good biocompatibility, enhanced electric conductivity and large specific surface area. The immobilized Cyt c in G-PEDOT matrix (graphene weight percentage < 2%) displays excellent direct electrochemistry and retains its biocatalytic activity toward the reduction of hydrogen peroxide. The electrochemical signal shows a linear response to H2O2 in the concentration range from 5.0 × 10− 7 to 4.0 × 10− 4 M with a detection limit of 2.49 × 10− 7 M. The results demonstrate that the G-PEDOT nanocomposite offers a biocompatible material for the construction of biofuel cells, bioelectronics and biosensors.
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