Unoccupied electronic states in graphite oxides

Electrochemical Intercalation of Sodium Ions into Thermally Reduced Graphite Oxide

“…This trend is commonly observed in the previous literatures. 18,19 The peak at 288.5 eV observed for TRGO300 is assigned to carbonyl groups or carboxylic acid 18,20,21 disappeared for TRGO900. In the OK region, three peaks due to O*(C=O), Q*(O-H) and Q*(C-O) were observed at 531.2, 535.8, 540.1 eV, respectively for GO.…”

Development of edge state on graphite surface induced by Ar+ irradiation studied using near-edge X-ray absorption fine structure spectroscopy

“…The broadening of the p * peak, in which the peak tail on the high energy side is extended to 286-287 eV, can originate from the functional groups. Actually, the r à CAH transition occurs in the approximate range of 286-288 eV [49][50][51], and the p à CAO and the r à CAO transitions are located over 287-291 eV [52][53][54]. Accordingly, we have concluded that the amount of oxygen-containing functional groups is below the detection limit in our experiments, and that the r-dangling bonds are mainly terminated by hydrogen atoms.…”

“…Thus, hydrogen and oxygen are considered to be plausible species that terminate dangling bonds. According to former studies, various transitions related to the states of functional groups [49][50][51][52][53][54] can occur in addition to the interlayer state [42,55,56] in the intermediate between the p * and the r * regions. In the present study, the PEY spectra of the pristine sample had a broad feature around 288 eV regardless of the angle of X-ray incidence, whereas the TEY spectra did not have such a feature, as shown in the insets of Fig.…”

Anomalously stable dispersions of graphite in water/acetone mixtures

“…In the infrared spectrum, some weak peaks were appeared at about 3500, 2900, 1650 cm À1 . These peaks were assigned as follows: 3540, 1632 (H 2 O or -OH); 2944, 2917, 2848 (-CH 2 -or -CH 3 ); 1729, 1409 (H 2 O or -COOH) cm À1 [25]. These results show that carbon is a major element, but oxidized parts such as carboxyl groups which is the origin of the surface negative charge are also present on the graphite surface.…”