Non-conducting polyaniline nanofibrils and their physico-chemical behavior

0525023 - FZÚ 2021 RIV GB eng J - Journal Article
Kohut, Olena - Dragounová, Kateřina - Ukraintsev, Egor - Szabó, Ondrej - Kromka, Alexander - Tomšík, Elena
Non-conducting polyaniline nanofibrils and their physico-chemical behavior.
Vacuum. Roč. 171, Jan (2020), s. 1-5, č. článku 108955. ISSN 0042-207X. E-ISSN 1879-2715
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GA17-19968S; GA ČR(CZ) GA17-05095S
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271 ; RVO:61389013
Keywords : polyaniline * Raman spectroscopy * photoluminescence
OECD category: Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis); Polymer science (UMCH-V)
Impact factor: 3.627, year: 2020
Method of publishing: Limited access
https://doi.org/10.1016/j.vacuum.2019.108955

The work presented here aimed to synthesize the non-conducting form of PANI nanofibrils and to study their properties, which are determined by their chemical structure and morphology. Non-conducting PANI nanofibrils were synthesized by an alkali-based treatment process. Raman measurements revealed that synthesized PANI nanofibrils consist mainly of benzenoid units with a small number of quinoid units. Calculations based on Raman spectra show that ratio of benzenoid to quinoid units is 3:1. This ratio is 3 times higher than the characteristic/typical value for synthesized non-conducting PANI, as reported in the literature. Moreover, the photoluminescence of these non-conducting PANI nanofibrils (measured with excitation of 442 nm) possesses two maxima, with wavelengths of 550 nm and 1110 nm. These wavelengths correspond to photon energies of 2.25 eV and 1.12 eV, which resemble very long Stokes shifts of 108 nm and 658 nm, respectively.
Permanent Link: http://hdl.handle.net/11104/0309227