Magnetization of Ultraviolet-Reduced Graphene Oxide Flakes in Composites Based on Polystyrene.

Alexander N Ionov,Ruslan Y Smyslov,Ruslan Y Smyslov,Mikhail P Volkov,Alexander N Bugrov,Marianna N Nikolaeva

doi:10.3390/ma14102519

Alexander N Ionov, Ruslan Y Smyslov + Show 4 more

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https://doi.org/10.3390/ma14102519

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Journal: Materials	Publication Date: May 12, 2021
Citations: 5	License type: CC BY 4.0

Affiliation: Ioffe Institute, Institute of Macromolecular Compounds

Abstract

This work presents our study results of the magnetization of multilayer UV-reduced graphene oxide (UV-rGO), polymer matrix (polystyrene), and a conjugated composite based on them. The mesoscopic structure of the composites synthesized in this work was studied by such methods as X-ray diffraction, SEM, as well as NMR-, IR- and Raman spectroscopy. The magnetization of the composites under investigation and their components was measured using a vibrating-sample magnetometer. It has been shown that the UV-reduction process leads to the formation of many submicron holes distributed inside rGO flakes, which can create edge defects, causing possibly magnetic order in the graphite samples under investigation on the mesoscopic level. This article provides an alternative explanation for the ferromagnetic hysteresis loop in UV-rGO on the base of superconductivity type-II.

Highlights

Our study showed that the magnetization of UV-reduced graphene oxide (UV-reduced graphene oxide (rGO)) flakes has a ferromagnetic type of hysteresis
Silicon atoms observed in UV-rGO flakes functionalized with TMSPM may indicate the attachment of an organosilicon compound to the defects on the graphene surface (Figure S1)
Since the process of graphene oxide (GO) synthesis includes the treatment of pristine graphite with concentrated H2 SO4 as an intercalant [22,26], during its subsequent transformation into the oxidized form and washing, sulfur-containing groups may remain in the sample [27]

Summary

Introduction

Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Spintronics uses two fundamental properties of the electron: charge and spin. Graphene can be an ideal material for spintronics because of its long charge diffusion length up to room temperature, provided that a ferromagnetic state can be created in graphene. Pristine bulk graphite and single or few-layer graphene are nonmagnetic themselves, but the ferromagnetic state occurs in carbon nanomaterials, such as graphene nanoribbons and nanofragments [1]

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