SYNTHESIS AND LYOPHILIZATION OF GRAPHENE OXIDE SHEETS WITH DIFFERENT DEGREES OF OXIDATION

Authors

DOI:

https://doi.org/10.15665/rp.v23i1.3541

Abstract

Graphene oxide (OG) with different degrees of oxidation was synthesized using the modified Hummers procedure. In addition, a freeze-drying drying procedure was carried out to obtain sheets with fewer impurities. The material obtained presented a wide band close to 3250 cm-1 corresponding to the O-H stretch in its FTIR spectrum, in addition to the presence of bands between 1000 – 2000 cm-1 corresponding to C=O (1720 cm-1), O-C=O (1400 cm-1) and C-O (1030 cm-1) bonds of oxygenated groups. In the Raman spectrum, two bands were observed between 1000–2000 cm-1, the D-band (1350 cm-1) and the G-band (1600 cm-1), and four wide bands between 2500–3500 cm-1 corresponding to the G*, G', 2D' and D-G bands, generated by the fluorescence emitted by the graphitic skeleton of the material. Both results confirmed the presence of oxygenated groups in the structure of the OG samples. The lyophilized samples presented essential bands such as the O-H tension (3250 cm-1), C=O tension (1720 cm-1), and C=C tension (1625 cm-1) of the FTIR spectrum and the D (1350 cm-1) and G (1600 cm-1) bands in the Raman spectrum, which allowed quantifying the effect of OG oxidation and fragmentation. Micrographs obtained by the AFM and SEM techniques confirmed that the sheets had up to 75 layers of graphene oxide. XPS spectroscopy was used for the OGm4 sample to verify the degree of oxidation, exhibiting an oxidation of 44.25%. The results obtained in this research demonstrate the possibility of preparing OG quickly and easily with different degrees of oxidation and lateral size of the sheets, which is fundamental in the biological applications of the material, such as bacterial inhibition and anti-cancer capacity

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Published

2025-03-21