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1 1 ) a) b) .) G 1 u . .u a 1 . (a D 2D D+G ( 1 y 2G it t 1 y s 1 i n s e 0 n te n 0 t In 0 I 0 294 292 290 288 286 284 282 280 500 1000 1500 2000 2500 3000 3500 Binding Energy (eV) Wavelength (cm-1) Fig. 7. Partially oxidised graphene platelets produced by ultrasound cavitation. (a) XPS C 1s spectrum showing evidence for sp3/sp2 carbon-carbon bonds (285.0 eV, FWHM = 1.7 eV) and high-energy features consistent with C–O (287.0 eV), C=O (288.6 eV) and O–C=O (290.0 eV) and -plasmon (low intensity, 291.7 eV). (b) Raman spectrum showing a G band (~1590 cm-1) that indicates a degree of oxidation and the presence of sp3 carbon atoms. The D band has higher intensity than in pristine graphene, which can be attributed to defects and disorder at both platelet edge and basal plane. ID/IG ~0.83, the FWHMG of ~87 cm-1 and the low intensity 2D band (seen with D+G and 2G overtones) are all consistent with reported behaviour for graphene platelets with a degree of oxidation.34 21PDF Image | graphene platelets with partial oxidation via cavitation
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