Self-assembled polyaniline nanotubes and nanoribbons/titanium dioxide nanocomposites
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Self-assembled polyaniline (PANI) nanotubes, accompanied with nanoribbons, were synthesized by the oxidative polymerization of aniline with ammonium peroxydisulfate in an aqueous medium, in the presence of colloidal titanium dioxide (TiO(2)) nanoparticles of 4.5 nm size, without added acid. The morphology, structure, and physicochemical properties of the PANI/TiO(2) nanocomposites. prepared at various initial aniline/TiO(2) mole ratios, were studied by scanning (SEM) and transmission (TEM) electron microscopies, FTIR, Raman and inductively coupled plasma optical emission (ICP-OES) spectroscopies, elemental analysis, X-ray powder diffraction (XRPD), conductivity measurements, and thermogravimetric analysis (TGA). The electrical conductivity of PANI/TiO(2) nanocomposites increases in the range 3.8 x 10(-4) to 1.1 x 10(-3) S cm(-1) by increasing aniline/TiO(2) mole ratio from 1 to 10. The morphology of PANI/TiO(2) nanocomposites significantly depends on the initial aniline/TiO(2) mole rat...io. In the morphology of the nanocomposite synthesized using aniline/TiO(2) mole ratio 10, nanotubes accompanied with nanosheets prevail. The nanocomposite synthesized at aniline/TiO(2) mole ratio 5 consists of the network of nanotubes (an outer diameter 30-40 nm, an inner diameter 4-7 nm) and nanorods (diameter 50-90 nm), accompanied with nanoribbons (a thickness, width, and length in the range of 50-70 nm, 160-350 nm, and similar to 1-3 mu m, respectively). The PANI/TiO(2) nanocomposite synthesized at aniline/TiO(2) mole ratio 2 contains polyhedral submicrometre particles accompanied with nanotubes, while the nanocomposite prepared at aniline/TiO(2) mole ratio 1 consists of agglomerated nanofibers, submicrometre and nanoparticles. The presence of emeraldine salt form of PANI, linear and branched PANI chains, and phenazine units in PANI/TiO(2) nanocomposites was proved by FTIR and Raman spectroscopies. The improved thermal stability of PANI matrix in all PANI/TiO(2) nanocomposites was observed. (C) 2010 Elsevier B.V. All rights reserved.
Кључне речи:Nanocomposites / Nanoribbons / Nanostructures / Nanotubes / Polyaniline / Titanium dioxide
Извор:Synthetic Metals, 2010, 160, 11-12, 1325-1334
- Ministry of Science and Technological Development of Serbia [142047, 142066], Czech Grant Agency [202/09/1626]
ISSN: 0379-6779 (print)