Reduced Graphene Oxide Obtained by Hummers and Marcano-Tour Methods: Comparison of Electrical Properties

Abstract

<jats:p>The aim of this paper is the comparison of structural, morphological and electrical properties of graphene oxide synthesized by Hummers and Marcano-Tour approaches and reduced graphene oxide obtained by hydrothermal hydrazine-assisted route. Obtained materials were characterized by XRD, scanning electron microscopy, low temperature nitrogen absorption and impedance spectroscopy. It was determined that reduced graphene oxide obtained by Hummers route is formed by plate-like agglomerates with respectively short distance between graphene layers that consist of plate-like particles with smaller average diameter and larger average thickness. Reduced graphene oxide that was synthesized by Marcano-Tour method is mesoporous solid material and consists of randomly aggregated linear fragments of carbon packages. It was suggested that dominant charge transport mechanism for both graphene oxide samples was proton conductivity. Both: charge migrating in graphene fragments and the morphologically sensitive charge hopping between them were observed for reduced graphene oxide.</jats:p>

Structural, morphological and electrical properties of graphene oxides obtained by Hummers, Tour and modified methods: a comparative study

“…Intense peaks at 2 of about 10.07,11.28 and 10.44 о were observed in XRD patterns of GO-H, GO-T and GO-M samples, respectively, that correspond to (001) diffraction reflex of the distorted graphite oxide lattice ( Fig. 1) [7].The approximation of symmetrical (001) reflexes for GO-H and GO-T samples with Gaussian functions (Fig. 2) allows to determining two most probable values of interplanar distance d(001) for these materials perpendicularly to the basal plane of graphene packages (Table 1).…”

“…There are a lot of Hummers method improvements and one of the most important changes was proposed by [6], where graphite and KMnO4 without NaNO3 were treated in the mixture of H2SO4 and H3PO4. This approach allows obtaining respectively larger hydrophilic oxidized graphite material compared to Hummers method with fewer defects in the basal plane [7]. GO consisting of packages of hydrophilic graphene layers with interplanar distances from 0.6 to 1.2 nm embedded water molecules are obtained [8].…”

Pengaruh Konsentrasi HCl Pada Proses Exfoliasi Graphene Oxide/Reduce Graphene Oxide (GO/rGO) Dari Karbon Bulu Ayam

“…Pembawa muatan pada frekuensi tinggi membentuk arus listrik hanya di daerah dekat permukaan partikel. Gugus fungsi hidrofilik (-OH, -COH) yang terletak pada permukaan lapisan GO mendukung proses transfer muatan melalui lompatan proton [18] . Spektra FTIR menunjukkan peningkatan intensitas gugus hidrofilik pada konsentrasi HCl, yang menyebabkan pada frekuensi tinggi (>10 5 Hz) konduktivitas GO-2 M paling tinggi.…”

Real-time imaging of structure and dynamics of transmembrane biomolecules by FRET-induced single-molecule fluorescence attenuation

“…In the SIFA experiments, a coverslip is rendered hydrophilic with H 2 SO 4 /H 2 O 2 solution or by an oxygen plasma cleaning procedure. Micrometer-sized monolayers graphene oxide is prepared following the modified Hummers method (Boychuk et al 2019 ; Feicht et al 2019 ) and deposited onto the coverslip with the Langmuir–Blodgett technique (Li et al 2011 ; Mangadlao et al 2015 ). Then the coverslips are reduced by heating in a vacuum to control the degree of oxidation.…”