Abstract
It has been reported that defect density in ball-milled graphite lattice increases with the milling time. Guided by this, we hypothesized that the oxygen content of graphene oxide can be substantially enhanced by oxidizing ball-milled graphite and also, the oxygen content would monotonically increase with the milling time as the defect sites would be preferred sites for oxidation. Interestingly, we observed that this correlation was not directly proportional for all milling hours. Even though, the defect density of graphite monotonically increased with milling time, the oxygen content of graphene oxide initially increased and then decreased. This was due to milling time dependent change in the size of the graphite plates and consequent relative abundance of the different oxygen containing functional groups on graphene oxide (GO) produced from the milled graphite.
Highlights
Graphite oxide constitutes of hydrophilic graphene sheets bearing oxygen moieties on their basal plane and edges[1,2]
The defect density was quantified by the ratio of the intensities of peaks corresponding to the D and G band (Supplementary Table S1) in the Raman signal
Oxygen content of graphene oxide (GO) was determined by the deconvolution of the high resolution C1s scans (Supplementary Fig. S3) obtained from X-ray photoelectron spectra (XPS)
Summary
Graphite oxide (or multi-layered GO) constitutes of hydrophilic graphene sheets bearing oxygen moieties (carbonyl, hydroxyl, epoxy and carboxyl groups) on their basal plane and edges[1,2]. Planetary ball-milling of graphite for different times was conducted.
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