title: Polypropylene/Polyaniline Nanofiber/Reduced Graphene Oxide Nanocomposite with Enhanced Electrical, Dielectric, and Ferroelectric Properties for a High Energy Density Capacitor.
abstract: This work demonstrates a ternary nanocomposite system, composed of polypropylene (PP), redoped PANI (r-PANI) nanofibers, and reduced graphene oxides (RGOs), for use in a high energy density capacitor. r-PANI nanofibers were fabricated by the combination methods of chemical oxidation polymerization and secondary doping processes, resulting in higher conductivity (σ≈156 S cm(-1)) than that of the primarily doped PANI nanofibers (σ≈16 S cm(-1)). RGO sheets with high electron mobility and thermal stability can enhance the conductivity of r-PANI/RGO (σ≈220 S cm(-1)) and thermal stability of PP matrix. These findings could be extended to combine the advantages of r-PANI nanofibers and RGO sheets for developing an efficient means of preparing PP/r-PANI/RGO nanocomposite. When the r-PANI/RGO cofillers (10 vol %) were added to PP matrix, the resulting PP/r-PANI/RGO nanocomposite exhibited high dielectric constant (ε'≈51.8) with small dielectric loss (ε″≈9.3×10(-3)). Furthermore, the PP/r-PANI/RGO nanocomposite was used for an energy-harvesting device, which demonstrated high energy density (Ue≈12.6 J cm(-3)) and breakdown strength (E≈5.86×10(3) kV cm(-1)).
authors.affiliation: Department of Chemistry and Biochemistry, University of California, Los Angeles (UCLA) , Los Angeles, California 90095, United States.|Program of Chemical Convergence for Energy and Environment (C2E2), School of Chemical and Biological Engineering, College of Engineering, Seoul National University , Shinlimdong 56-1, Seoul 151-742, Korea.
authors.forename: Sunghun
authors.initials: S
authors.lastname: Cho
authors.affiliation: Program of Chemical Convergence for Energy and Environment (C2E2), School of Chemical and Biological Engineering, College of Engineering, Seoul National University , Shinlimdong 56-1, Seoul 151-742, Korea.
authors.forename: Minkyu
authors.initials: M
authors.lastname: Kim
authors.affiliation: Program of Chemical Convergence for Energy and Environment (C2E2), School of Chemical and Biological Engineering, College of Engineering, Seoul National University , Shinlimdong 56-1, Seoul 151-742, Korea.|Electrochemical Energy Laboratory & Materials Science and Engineering Program, The University of Texas at Austin , Austin, Texas 78712, United States.
authors.forename: Jun Seop
authors.initials: JS
authors.lastname: Lee
authors.affiliation: Program of Chemical Convergence for Energy and Environment (C2E2), School of Chemical and Biological Engineering, College of Engineering, Seoul National University , Shinlimdong 56-1, Seoul 151-742, Korea.
authors.forename: Jyongsik
authors.initials: J
authors.lastname: Jang
keywords: dielectric capacitor; graphene; nanocomposite; polyaniline; polypropylene