Hydrostatic Compression of Graphite Oxide to 49 GPa: A Raman Spectroscopic Study

ABSTRACTThe compression and decompression behaviors of graphite oxide have been investigated using in situ Raman measurements in a diamond-anvil cell at room temperature. The so-called G band (in-plane E2g mode ∼1600 cm-1) was followed to 49 GPa during compression and back to ambient under decompression. The Raman frequency of the G band increases sublinearly with increasing hydrostatic pressure, eventually nearly flattening out at the highest pressure measured. This trend is reversed upon decompression, fully recovering to the ambient spectrum. The increased broadening suggests a reversible disordering of the structure without significant sp2-sp3 rehybridization under pressure.