Conditions Extrêmes et Matériaux : Haute Température et Irradiation

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S.Hussain, E.Kovacevic, R.Amade, J.Berndt, C.Pattyn, A.Dias, Ch.Boulmer-Leborgne, M.R.Ammar, E.Bertran-Serra, 'Plasma synthesis of polyaniline enrobed carbon nanotubes for electrochemical applications', Electrochim. Acta 268 218-225 (2018) doi:10.1016/j.electacta.2018.02.112

Radio frequency plasma-enhanced chemical vapor deposition (RF-PECVD) was employed to synthesize vertically aligned carbon nanotubes (VACNTs) using Ni catalyst on TiN/SiO2/Si substrate. Subsequently, CNTs were covered by a thin film of polyaniline (PANI) applying RF-plasma polymerization method. The structure and chemical nature of the samples were identified by microscopic and spectroscopic techniques. Scanning electron microscopy (SEM) evidences the presence of a PANI thin film wrapping the surface of CNTs. X-ray photoelectron spectroscopy (XPS) reveals that PANI presents a polyemeraldine based structure. Raman spectroscopy results show the appearance of fluorescence caused by a thin film of PANI over the carbon nanotubes. VACNTs and PANI enrobed VACNTs were electrochemically tested for supercapacitor applications in 0.2 M Na2SO4 electrolyte solution. VACNTs and PANI/CNTs electrodes deliver specific capacitances of 12 F/g and 1225 F/g respectively, at a scan rate of 5 mV/s. Cycling stability results show that at 15 A/g current density, PANI/CNTs composite retains 65% of the initial specific capacitance (410 F/g) after 5800 cycles.