Comparison analysis of graphene oxide reduction methods

Bunyaev, Vitalii A.; Chernysheva, Maria G.; Попов, А. Г.; Grigorieva, Anastasia V.; Badun, G. A.

doi:10.1080/1536383x.2019.1686619

Cited by 6 publications

(2 citation statements)

References 17 publications

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“…These modes indicate hydrogen atoms covalently bonded to the graphene layer. Such peaks, assigned to C sp 3 –H, were observed for rGO obtained by reduction at 2000 K in hydrogen atmosphere …”

Section: Resultsmentioning

confidence: 73%

“…Such peaks, assigned to C sp 3 −H, were observed for rGO obtained by reduction at 2000 K in hydrogen atmosphere. 61 The number of the hydrogen-induced PCs in prGO is definitely too low to give a visible contribution to the FTIR spectrum. Consequently, the observation of peaks attributed to C sp 3 −H bonds shows that the number of the attached hydrogen atoms is significantly higher than is detected in the FSED spectrum.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Electron Spin Echo Studies of Hydrothermally Reduced Graphene Oxide

et al. 2021

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Ecofriendly hydrothermal reduction of graphene oxide is widely used for producing hydrogels and aerogels, but it yields partly reduced graphene oxide (prGO) containing oxygen groups and some number of paramagnetic centers (PCs). In order to identify structural changes introduced by the reduction process, these PCs are studied by electron spin echo spectroscopy in the temperature range of 5–160 K. Two types of PCs with different spin–lattice (T 1) and phase memory (T m) relaxation times observed below 20 K result from a nonuniform distribution of magnetic defects. Above 20 K, only the PCs with the shorter T 1 and T m persist. Temperature dependences of T 1 and the distribution of T 1 for each type of the PCs reveal lattice distortions around the PCs and structural disorder in prGO. The unusually strong temperature dependence of the spin echo intensity is explained by the localization of conduction electrons. The localization is destroyed at high temperature, and exchange interactions decrease the number of the observed PCs. Every such PC is created by the sp 3 defect induced by hydrogen covalently bonded to graphene. The obtained results indicate that the hydrothermal reduction is accompanied by partial hydrogenation of graphene. The presence of such hydrogen atoms is confirmed by infrared spectroscopy.

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Section: Resultsmentioning

confidence: 73%

Section: ■ Results and Discussionmentioning

confidence: 99%