Synthesis and characterization of conducting self-assembled polyaniline nanotubes/zeolite nanocomposite.
Self-assembled conducting, paramagnetic polyaniline nanotubes have been synthesized by the oxidative polymerization of aniline with ammonium peroxydisulfate in aqueous medium in the presence of zeolite HZSM-5, without added acid. The influence of initial zeolite/aniline weight ratio on the conductivity, molecular and supramolecular structure, paramagnetic characteristics, thermal stability, and specific surface area of polyaniline/zeolite composites was studied. The conducting (approximately 10(-2) S cm(-1)), semiconducting (3 x 10(-5) S cm(-1)), and nonconducting (5 x 10(-9) S cm(-1)) composites are produced using the zeolite/aniline weight ratios 1, 5, and 10, respectively. The coexistence of polyaniline nanotubes, which have a typical outer diameter of 70-170 nm and an inner diameter of 5-50 nm, accompanied by nanorods with a diameter of 60-100 nm and polyaniline/zeolite mesoporous aggregates, distinct from the morphology of microporous zeolite HZSM-5, was proved in the conducting nanocomposite by scanning and transmission electron microscopies. FTIR spectroscopy confirmed the presence of polyaniline in the form of conducting emeraldine salt and suggested significant interaction of polyaniline with zeolite. The evolution of molecular and supramolecular structure of polyaniline in the presence of zeolite was discussed.
Cirić-Marjanović
Gordana
G
Faculty of Physical Chemistry, University of Belgrade, and Institute of General and Physical Chemistry, Studentski Trg 12-16, 11158 Belgrade, Serbia. gordana@ffh.bg.ac.yu
Dondur
Vera
V
Milojević
Maja
M
Mojović
Milos
M
Mentus
Slavko
S
Radulović
Aleksandra
A
Vuković
Zorica
Z
Stejskal
Jaroslav
J
D000645:Ammonium Sulfate / Q000737:chemistry; D000814:Aniline Compounds / Q000737:chemistry*; D004305:Dose-Response Relationship, Drug; D004553:Electric Conductivity; D004578:Electron Spin Resonance Spectroscopy; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D008956:Models, Chemical; D053761:Nanocomposites / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D043942:Nanotubes / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D014867:Water / Q000737:chemistry; D017641:Zeolites / Q000737:chemistry
D000814:Aniline Compounds; D011108:Polymers; C416807:polyaniline; D014867:Water; D017641:Zeolites; C031276:ammonium peroxydisulfate; D010100:Oxygen; D000645:Ammonium Sulfate