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Sample pictures. (a) graphite, (b) GO, (c) GO reacted with NaOH, and (d) NaOH-GO film. The scale bar in (a)-(d) is 1 mm.
FT-IR spectra of GO and NaOH-GO film.
C core-level XPS spectra of (a) polycrystalline graphite (99.995+%, Aldrich), (b) GO, (c) NaOH-reacted GO, and (d) NaOH-GO film.
Differential reflectivity (R/R) versus pump-probe delay of NaOH-GO film at different temperatures.
The two relaxation processes in NaOH-GO film as a function of lattice temperature. (a) temperature-independent . (b) temperature-independent . The red solid lines are linear fits, and the dashed lines are guides to the eyes.
Schematic diagram of a NaOH-GO film. The layers are wrinkled and have so many chemical groups. Hydrogen bonds are apparent between chemical groups (dot lines).
Atomic structures for four GO structures concerned with this work, containing (a) only epoxy groups, (b) only ketone groups, (c) -OH groups on the two surfaces, and (d) -OH and -ONa groups on the two surfaces. The purple, red, gray and white colors represent sodium, oxygen, carbon and hydrogen atoms, respectively. In addition, (e) shows point wavefuction plot for the electron doping of (d). Yellow, purple, and red circles represent carbon, sodium, and oxygen atoms, respectively.
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