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Cui Q.,Key Laboratory of Petroleum and Gas Fine Chemicals | Mi H.,Key Laboratory of Petroleum and Gas Fine Chemicals | Qiu J.,Carbon Research Laboratory | Yu C.,Carbon Research Laboratory | Zhao Z.,Carbon Research Laboratory
Journal of Materials Research | Year: 2014

By using microemulsion-mediated solvothermal method in the presence of camphorsulfonic acid as a dopant, self-aggregated polyaniline (PANI) nanowires were synthesized and further organized into three-dimensional cluster-connected networks. So-formed PANI exhibited a hierarchically porous structure, which was significantly different from those obtained by conventional chemical oxidation method, hydrothermal method, and other reported methods. Compared with nanofibers presented in this study, the nanowires in the clusters had a great decrease in diameter from ~60 to ~15 nm due to the space-confined polymerization. In addition, the size of the clusters could be easily adjusted by altering the dopant/monomer molar ratio. A probable assembly mechanism for such an interesting morphology was proposed. Used as an electrode material, PANI clusters showed high specific capacitances (510 and 368 F g-1 at 0.5 and 2 A g-1, respectively) and improved cycling stability (66% capacitance retention over 1000 cycles) as compared to PANI fibers and particles obtained by other methods, which may be related to its unique morphology and high doping level. Copyright © Materials Research Society 2014.

Abdiryim T.,Xian Jiaotong University | Abdiryim T.,Key Laboratory of Petroleum and Gas Fine Chemicals | Jamal R.,Key Laboratory of Petroleum and Gas Fine Chemicals | Zhao C.,Key Laboratory of Petroleum and Gas Fine Chemicals | And 3 more authors.
Synthetic Metals | Year: 2010

A polyterthiophene derivative: poly(3′,4′-ethylenedioxy-2,2′:5′,2″-terthiophene) was synthesized by solid-state oxidative-polymerization of 3′,4′-ethylenedioxy-2,2′:5′,2″-terthiophene (TET) in various ratios of oxidant (FeCl3) to the monomer (TET). The resulting polymers were characterized by FT-IR, 1H NMR, TEM, SEM, UV-vis-NIR, GPC, X-ray diffraction, EDX, CV, galvanostatic charge-discharge, as well as TGA and conductivity measurements. The results showed that the as-made poly(TET)s were partially in doped state with a conductivity ranging from 2.1 × 10-3 S cm-1 to 8.1 × 10-3 S cm-1 at room temperature, and exhibited good thermal stability in nitrogen up to 337-356 °C. The poly(TET)s showed a similar UV-vis absorption peak at 462 nm in acetonitrile. In addition, as-made poly(TET)s had low molecular weight ranging from 3300 to 3500 with microstructured morphology including nanorodes and nanofibers, and presented one redox couple at 1.1-1.2 V(ox) and 0.6-0.7 V(re) in 0.1 M Et4NBF4 acetonitrile solution. A moderate specific capacitance of 71 F g-1 for poly(TET) modified graft electrode was obtained within the potential range of -0.2 V to 0.5 V in 1 M H2SO4 solution. X-ray diffraction results imply the enhanced crystallinity of poly(TET)s, indicating the existence of crystalline phase in polymer matrix. Furthermore, the comparison of results from every measurement indicated that the [FeCl3]/[TET] ratio strongly affects the morphology of the poly(TET), and the fibrillar growth tendency of poly(TET) was observed with the increase of the [FeCl3]/[TET] ratio, and long-length fibrillar morphology occurred in the highest [FeCl3]/[TET] ratio. © 2009 Elsevier B.V. All rights reserved.

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