Ultrafast carrier phonon dynamics in NaOH-reacted graphite oxide film

NaOH-reacted graphite oxide film was prepared by decomposing epoxy groups in graphite oxide into hydroxyl and -ONa groups with NaOH solution. Ultrafast carrier dynamics of the sample were studied by time-resolved transient differential reflection (ΔR/R). The data show two exponential relaxation proc...

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Bibliographic Details
Published in:Applied physics letters 2012-07, Vol.101 (2)
Main Authors: Lee, Dongwook, Zou, Xingquan, Zhu, Xi, Seo, J. W., Cole, Jacqueline M., Bondino, Federica, Magnano, Elena, Nair, Saritha K., Su, Haibin
Format: Article
Language:English
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Summary:NaOH-reacted graphite oxide film was prepared by decomposing epoxy groups in graphite oxide into hydroxyl and -ONa groups with NaOH solution. Ultrafast carrier dynamics of the sample were studied by time-resolved transient differential reflection (ΔR/R). The data show two exponential relaxation processes. The slow relaxation process (∼2ps) is ascribed to low energy acoustic phonon mediated scattering. The electron-phonon coupling and first-principles calculation results demonstrate that -OH and -ONa groups in the sample are strongly coupled. Thus, we attribute the fast relaxation process (∼0.17ps) to the coupling of hydroxyl and -ONa groups in the sample.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4736572