title: Controllable synthesis of highly conductive polyaniline coated silica nanoparticles using self-stabilized dispersion polymerization.
abstract: Highly conductive silica/polyaniline (PANi) core/shell nanoparticles (NPs) were synthesized in various diameters (from 18 to 130 nm) using self-stabilized dispersion polymerization. The polymerization was carried out in an aqueous/organic liquid system at -30 °C. In this system, the organic phase plays a key role in directing para-direction oriented polymerization of the PANi on the surface of silica NPs. Because of its para-direction polymerized structure, the synthesized silica/PANi core/shell NPs exhibited enhanced electrical conductivity (25.6 S cm(-1)) compared with NPs (1.4 S cm(-1)) prepared by homogeneous polymerization. The conductivities and BET surface areas were 25.6 S cm(-1)/170 m(2) g(-1) (18 nm in diameter), 22.5 S cm(-1)/111 m(2) g(-1) (35 nm in diameter), 18.3 S cm(-1)/78 m(2) g(-1) (63 nm in diameter), and 16.4 S cm(-1)/53 m(2) g(-1) (130 nm in diameter). In this series, increased para-coupling along the polymer backbone was elucidated using several characterization techniques, including Fourier transform infrared (FTIR), X-ray diffraction (XRD), and nuclear magnetic resonance (NMR) spectroscopy. As-prepared silica/PANi core/shell NPs exhibited capacitance as high as 305 F g(-1).
authors.affiliation: WCU program of Chemical Convergence for Energy and Environment (C2E2), School of Chemical and Biological Engineering, College of Engineering, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea.
authors.forename: Minkyu
authors.initials: M
authors.lastname: Kim
authors.forename: Sunghun
authors.initials: S
authors.lastname: Cho
authors.forename: Jooyoung
authors.initials: J
authors.lastname: Song
authors.forename: Suim
authors.initials: S
authors.lastname: Son
authors.forename: Jyongsik
authors.initials: J
authors.lastname: Jang
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D004553:Electric Conductivity; D004566:Electrodes; D053758:Nanoparticles / Q000737:chemistry*; D058105:Polymerization; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D000814:Aniline Compounds; C416807:polyaniline; D012822:Silicon Dioxide