期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 22, 期 15, 页码 -出版社
MDPI
DOI: 10.3390/ijms22158260
关键词
poly(o-phenylenediamine); poly(vinylidene fluoride); carbon nanotubes; photoluminescence; Raman scattering; IR spectroscopy
资金
- European Regional Development Fund under the Competitiveness Operational Program 2014-2020, titled Physico-chemical analysis, nanostructured materials and devices for applications in the pharmaceutical field and medical in Romania by the National Institu [58/05.09.2016]
- National Authority for Scientific Research and Innovation on behalf of the Ministry of European Funds by the National Institute of Materials Physics [215/30.01.2019]
- IT Centre for Science and Technology
A new composite material based on POPD fiber like structures, PVDF spheres, and DWNTs was synthesized, with changes in optical properties observed as a result of covalent functionalization of the carbon nanotubes. The presence of PVDF spheres on the surface of POPD fibers induced steric effects, affecting photoluminescence processes. Anisotropic photoluminescence studies revealed changes in binding angles as the concentration of carbon nanotubes increased in the composites.
In this work, synthesis and optical properties of a new composite based on poly(o-phenylenediamine) (POPD) fiber like structures, poly(vinylidene fluoride) (PVDF) spheres and double-walled carbon nanotubes (DWNTs) are reported. As increasing the PVDF weight in the mixture of the chemical polymerization reaction of o-phenylenediamine, the presence of the PVDF spheres onto the POPD fibers surface is highlighted by scanning electron microscopy (SEM). The down-shift of the Raman line from 1421 cm(-1) to 1415 cm(-1) proves the covalent functionalization of DWNTs with the POPD-PVDF blends. The changes in the absorbance of the IR bands peaked around 840, 881, 1240 and 1402 cm(-1) indicate hindrance steric effects induced of DWNTs to the POPD fiber like structures and the PVDF spheres, as a consequence of the functionalization process of carbon nanotubes with macromolecular compounds. The presence of the PVDF spheres onto the POPD fiber like structures surface induces a POPD photoluminescence (PL) quenching process. An additional PL quenching process of the POPD-PVDF blends is reported to be induced in the presence of DWNTs. The studies of anisotropic PL highlight a change of the angle of the binding of the PVDF spheres onto the POPD fiber like structures surface from 50.2 degrees to 38 degrees when the carbon nanotubes concentration increases in the POPD-PVDF/DWNTs composites mass up to 2 wt.%.
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