NaOH-assisted hydrothermal reduction of graphene oxide

Kotsyubynsky, Volodymyr, Khimyak, Yaroslav Z. ORCID: https://orcid.org/0000-0003-0424-4128, Zapukhlyak, Ruslan, Boychuk, Volodymyra, Turovska, Liliia and Hoi, Vladyslav (2024) NaOH-assisted hydrothermal reduction of graphene oxide. Journal of Physics: Condensed Matter, 36 (49). ISSN 0953-8984

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Abstract

The influence of the pH of the reaction medium on the structural characteristics of hydrothermally reduced graphene oxide, synthesized by the tour method, has been investigated. Varying the pH of the reaction medium within the range of 8.0, 10.0 and 12.0 (adjusted with NaOH) has revealed distinct effects on the morphology and properties of the resulting reduced graphene oxide. At a pH of 8.0 the hydrothermal treatment yielded reduced graphene oxide comprising of two particle fractions with a thickness equivalent to 4–5 graphitic layers each. In contrast, pH of 10.0 resulted in two particle fractions corresponding to 2–3 and 4 layers, respectively, while pH of 12.0 produced a single fraction with a particle thickness of 0.70 nm, encompassing 3 graphitic layers. Increasing the pH led to a decrease in the average lateral size of reduced graphene oxide particles to about 8 nm. All rGOs had micro- and mesopores with a specific surface area up to 226 m2 g−1, showing a proportional increase in mesopores with increasing pH. Analysis of slit-like micropores revealed a minimum fractal dimension (D = 2.18) at pH = 8.0. The obtained results provide valuable insights into tailoring the structural properties of hydrothermally reduced graphene oxide by controlling the pH of the reaction medium, offering potential applications in various fields, including nanotechnology and materials science.

Item Type:	Article
Additional Information:	Data availability statement: The data that support the findings of this study are openly available at the following URL/DOI: https://zenodo.org/uploads/12789908. Funding Information: This work was supported by UK-Ukraine Twinning initiative project 'Soil preparation for reconstruction—soil decontamination in Ukraine, eco-entrepreneurship and environmental journalism' (Sponsor Ref. #11123 UEA Ref: R212285).
Uncontrolled Keywords:	raman spectra,xrd,graphene oxide,hydrothermal reduction,ph,reduced graphene oxide,materials science(all),condensed matter physics ,/dk/atira/pure/subjectarea/asjc/2500
Faculty \ School:	Faculty of Science > School of Chemistry, Pharmacy and Pharmacology
UEA Research Groups:	Faculty of Science > Research Groups > Pharmaceutical Materials and Soft Matter
Related URLs:	http://www.scopus.com/inward/record.url?...
Depositing User:	LivePure Connector
Date Deposited:	03 Dec 2024 01:36
Last Modified:	12 Dec 2024 01:53
URI:	https://ueaeprints.uea.ac.uk/id/eprint/97877
DOI:	10.1088/1361-648X/ad75dc

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