UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2024-11-22 2:33
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Conference: Bucharest University Faculty of Physics 2024 Meeting


Section: Solid State Physics and Materials Science


Title:
Synthesis and physico-electrochemical properties of the POT/RGO and POT/WS2 composites


Authors:
Teodora BURLANESCU(1,2), Mihaela BAIBARAC(1)


*
Affiliation:
1) National Institute of Materials Physics, Atomistilor street 405A, P.O. Box MG-7, 077125 Bucharest, Romania

2) Faculty of Physics, University of Bucharest, P.O. Box MG-11, 077125 Bucharest, Romania


E-mail
teodora.burlanescu@infim.ro


Keywords:
conducting polymer, functionalization, reduced graphene oxide, transition metal dichalcogenide, exfoliation, poly(o-toluidine), composites


Abstract:
Three methods were used to prepare the poly(o-toluidine)/reduced graphene oxide (POT/RGO) composites and the poly(o-toluidine)/WS2 (POT/WS2) composites: i) the interaction in solid state of the two constituents (POT with RGO and POT with WS2), ii) the chemical polymerization of o-toluidine (OT) in the presence of the RGO layers or WS2 nanoparticles and iii) the electrochemical polymerization of OT assisted by the RGO or WS2 sheets. Using correlated studies of Raman scattering, FTIR spectroscopy and X-ray photoelectron spectroscopy, we demonstrated that: i) the interaction in solid state of POT with RGO leads to a non-covalently functionalization of RGO with POT; ii) the chemical polymerization of OT in the presence of RGO results in a covalently functionalization of RGO with POT in emeraldine base (EB) state and leucoemeraldine salt (LS) state and iii) the electrochemical polymerization of OT in the presence of RGO sheets leads to a covalently functionalization of RGO with POT-LS and POT-emeraldine salt (ES). Moreover, the WS2 sheets were obtained using the ball milling method on WS2 nanoparticles, followed by an ultrasonication process in N,N’-dimethyl formamide. Thus, using X-ray diffraction, the exfoliation process of the WS2 nanoparticles was highlighted. Correlated studies of Raman scattering, FTIR spectroscopy and X-ray photoelectron spectroscopy (XPS) have demonstrated that: a) the chemical polymerization of OT in the presence of WS2 nanoparticles leads to the POT/WS2 composites, which contain repeating units of POT in LS state; while ii) the electrochemical polymerization of OT in the presence of WS2 sheets leads to POT/WS2 composites, containing repeating units of POT in ES state.