One-step synthesis, characterization and properties of novel hybrid electromagnetic nanomaterials based on polydiphenylamine and Co-Fe particles in the absence and presence of single-walled carbon nanotubes

Sveta Zhiraslanovna Ozkan; Galina Petrovna Karpacheva; Mikhail Nikolaevich Efimov; Andrey Aleksandrovich Vasilev; Dmitriy Gennad'evich Muratov; Valeriy Alekseevich Petrov; Petr Aleksandrovich Chernavskii; Galina Viktorovna Pankina

doi:10.1039/d1ra03114g

One-step synthesis, characterization and properties of novel hybrid electromagnetic nanomaterials based on polydiphenylamine and Co-Fe particles in the absence and presence of single-walled carbon nanotubes

RSC Adv. 2021 Jul 15;11(40):24772-24786. doi: 10.1039/d1ra03114g. eCollection 2021 Jul 13.

Authors

Sveta Zhiraslanovna Ozkan¹, Galina Petrovna Karpacheva¹, Mikhail Nikolaevich Efimov¹, Andrey Aleksandrovich Vasilev¹, Dmitriy Gennad'evich Muratov¹, Valeriy Alekseevich Petrov¹, Petr Aleksandrovich Chernavskii^{1

2}, Galina Viktorovna Pankina^{1

2}

Affiliations

¹ A. V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences 29 Leninsky Prospect Moscow 119991 Russia ozkan@ips.ac.ru.
² Department of Chemistry, Lomonosov Moscow State University 1-3 Leninskie Gory Moscow 119991 Russia.

Abstract

A one-step preparation method for hybrid electromagnetic nanomaterials based on polydiphenylamine (PDPA) and bimetallic Co-Fe particles in the absence and presence of single-walled carbon nanotubes (SWCNT) was proposed. During IR heating of PDPA in the presence of Co(ii) and Fe(iii) salts in an inert atmosphere at T = 450-600 °C, the polycondensation of diphenylamine (DPA) oligomers and dehydrogenation of phenyleneamine units of the polymer with the formation of C[double bond, length as m-dash]N bonds and reduction of metals by evolved hydrogen with the formation of bimetallic Co-Fe particles dispersed in a polymer matrix occur simultaneously. When carbon nanotubes are introduced into the reaction system, a nanocomposite material is formed, in which bimetallic Co-Fe particles immobilized on SWCNT are distributed in the matrix of the polymer. According to XRD data, reflection peaks of bimetallic Co-Fe particles at diffraction scattering angles 2θ = 69.04° and 106.5° correspond to a solid solution based on the fcc-Co crystal lattice. According to SEM and TEM data, a mixture of particles with sizes of 8-30 nm and 400-800 nm (Co-Fe/PDPA) and 23-50 nm and 400-1100 nm (Co-Fe/SWCNT/PDPA) is formed in the nanocomposites. The obtained multifunctional Co-Fe/PDPA and Co-Fe/SWCNT/PDPA nanomaterials demonstrate good thermal, electrical and magnetic properties. The saturation magnetization of the nanomaterials is M _S = 14.99-31.32 emu g^-1 (Co-Fe/PDPA) and M _S = 29.48-48.84 emu g^-1 (Co-Fe/SWCNT/PDPA). The electrical conductivity of the nanomaterials reaches 3.5 × 10^-3 S cm^-1 (Co-Fe/PDPA) and 1.3 S cm^-1 (Co-Fe/SWCNT/PDPA). In an inert medium, at 1000 °C the residue is 71-77%.