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Ultrafast carrier phonon dynamics in NaOH-reacted graphite oxide film
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10.1063/1.4736572
/content/aip/journal/apl/101/2/10.1063/1.4736572
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/2/10.1063/1.4736572
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

FT-IR spectra of GO and NaOH-GO film.

Image of FIG. 3.
FIG. 3.

C core-level XPS spectra of (a) polycrystalline graphite (99.995+%, Aldrich), (b) GO, (c) NaOH-reacted GO, and (d) NaOH-GO film.

Image of FIG. 4.
FIG. 4.

Differential reflectivity (R/R) versus pump-probe delay of NaOH-GO film at different temperatures.

Image of FIG. 5.
FIG. 5.

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.

Image of FIG. 6.
FIG. 6.

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).

Image of FIG. 7.
FIG. 7.

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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/content/aip/journal/apl/101/2/10.1063/1.4736572
2012-07-12
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ultrafast carrier phonon dynamics in NaOH-reacted graphite oxide film
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/2/10.1063/1.4736572
10.1063/1.4736572
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