2012/07/09 by Dongwook Lee, Xingquan Zou, Xi Zhu +7
Chemistry · Materials Science · Physics and Astronomy · #Advanced NMR Techniques and Applications #Graphene research and applications #Transition Metal Oxide Nanomaterials #cond-mat.mtrl-sci
paper · pdf · doi:10.1063/1.4736572
published as Appl. Phys. Lett. 101, 021604 (2012)
openalex publication_date 2012/07/09 · arxiv created 2012/07/16 · arxiv updated 2012/07/17 · openalex created_date 2020/11/23 · openalex updated_date 2026/07/28
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.