Chemical polymerization of o-phenylenediamine (OPD) in the presence of poly(ethylene oxide), double-wall carbon nanotubes (DWNTs) and ferric chloride is carried out in order to obtain composites based on the poly(o-phenylenediamine)-poly(ethylene oxide) (POPD-PEO) fibres covered and
interconnected with DWNTs. Vibrational and photoluminescence properties of these composite materials as well as their morphologies are shown by infrared (IR) spectroscopy, Raman scattering, photoluminescence (PL) and scanning electron microscopy (SEM). An adsorption of DWNTs onto the POPD
rods surface in the absence and in the presence of PEO is highlighted by SEM. The vibrational changes reported by Raman scattering and IR spectroscopy prove a covalent functionalization of DWNTs with the macromolecular compound POPD which is doped with FeCl−
New hydrogen bonds are generated between POPD covalently functionalized DWNTs and hydroxyl groups of PEO according to IR spectroscopic studies. The two macromolecular compounds, POPD and POPD-PEO, show a complex emission band with maxima at 572 and 566 nm, having a shoulder at 667 nm. A significant
change in the profile of the PL bands of POPD and POPD-PEO is induced in the DWNTs presence. We show that DWNTs induce (i) a diminution in the POPD PL band intensity peaked between 525–600 nm simultaneous with the increase in the intensity of the PL band situated in the 600–800
nm spectral range and (ii) an enhancement process of the emission band localized in the 475–800 nm spectral range in the case of POPD-PEO.
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Document Type: Research Article
National Institute of Materials Physics, Laboratory of Optical Processes in Nanostructured Materials Physics, Atomistilor Street 405A, Magurele, RO-77125, Romania
IT Centre for Science and Technology, 25 No. Av. Radu Beller Street, 011702 Bucharest, Romania
April 1, 2021
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