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Influence of Reduced Graphene Oxide on the Electropolymerization of 5-Amino-1-naphthol and the Interaction of 1,4-Phenylene Diisothiocyanate with the Poly(5-Amino-1-naphtol)/Reduced Graphene Oxide Composite

1
Laboratory of Optical Processes in Nanostructured Materials, National Institute of Materials Physics, Atomistilor Street 405A, P.O. Box MG-7, RO77125 Magurele, Romania
2
Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Gh. Polizu St 1-7, 011061 Bucharest, Romania
3
Magnetism and Superconductivity Laboratory, National Institute of Materials Physics, Atomistilor Street 405A, P.O. Box MG-7, RO77125 Magurele, Romania
4
Nanoscale Condensed Matter Laboratory, National Institute of Materials Physics, Atomistilor Street 405A, P.O. Box MG-7, RO77125 Magurele, Romania
5
Pro-Vitam Ltd., Muncitorilor Street 16, 520032 Sfantu Gheorghe, Romania
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(6), 1299; https://doi.org/10.3390/polym12061299
Received: 10 May 2020 / Revised: 31 May 2020 / Accepted: 3 June 2020 / Published: 5 June 2020
A new composite base on reduced graphene oxide (RGO) and poly(5-amino-1-naphthol) (P5A1N) was synthesized by the electrochemical polymerization of 5-amino-1-naphthol (5A1N) in the presence of HClO4 and H4SiW12O40 onto the surface of Au electrode covered with the RGO sheets. The linear dependence of the current densities of the anodic and cathodic peaks with the scan rate of the potential range (0; 0.8) V vs. SCE, reported during electropolymerization of 5A1N, indicates an electron transfer that is controlled by diffusion. A covalent functionalization of the RGO sheets with P5A1N is argued by: (i) the simultaneous disappearance of the IR band at 1584 cm−1 and the appearance of the new IR bands at 812, 976 and 3744 cm−1, and (ii) the appearance of two Raman lines at 738 and 1428 cm−1. An application of the RGO sheets covalently functionalized with P5A1N is demonstrated to support 1,4-phenylene diisothiocyanate (PDITC), a compound used as a cross-linking agent for various biological applications. The chemical adsorption of PDITC onto the RGO sheets covalently functionalized with P5A1N, which involves the appearance of new functional groups of the type thiourea, was proven by Raman scattering and IR spectroscopy. View Full-Text
Keywords: poly(5-amino-1-naphthol); reduced graphene oxide; functionalization poly(5-amino-1-naphthol); reduced graphene oxide; functionalization
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Baibarac, M.; Daescu, M.; Socol, M.; Bartha, C.; Negrila, C.; Fejer, S.N. Influence of Reduced Graphene Oxide on the Electropolymerization of 5-Amino-1-naphthol and the Interaction of 1,4-Phenylene Diisothiocyanate with the Poly(5-Amino-1-naphtol)/Reduced Graphene Oxide Composite. Polymers 2020, 12, 1299.

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