研究目的
Investigating the ultrafast optical response of graphite in powder form treated by laser ablation and reduced graphene oxide (rGO), aiming future application of optical switching.
研究成果
Graphite and rGO exhibit ultrafast excitation and relaxation, with carrier relaxation occurring between 260 and 309 fs, making them suitable for future optical switching applications. Despite rGO showing higher absorption intensity, graphite is a cheaper alternative for such applications.
研究不足
The study focuses on the optical switching behavior of graphite and rGO, but does not explore composite materials with graphite for enhanced TA intensity, which could be a potential area for future research.
1：Experimental Design and Method Selection:
Graphite was laser-ablated and characterized using XRD, Raman spectroscopy, SEM, and UV-Vis spectroscopy. rGO was prepared by modified Hummers' method and reduced by thermal reduction. Ultrafast Visible-pump/NIR-probe femtosecond transient absorption spectroscopy was used to study carrier relaxation dynamics.
2：Sample Selection and Data Sources:
Graphite powder (?20 μm size) and chemicals for rGO preparation were purchased from Sigma-Aldrich.
3：List of Experimental Equipment and Materials:
Nd:YAG laser for ablation, absorption spectrometer (JASCO, V-670), SEM (S-4700, Hitachi), Raman microscope (Horiba), X-ray diffractometer (Bruker AXSD-8 Advance), femtosecond titanium sapphire laser with a regenerative amplifier (Hurricane, Spectra Physics).
4：Experimental Procedures and Operational Workflow:
Laser ablation of graphite, preparation and reduction of GO to rGO, characterization by XRD, Raman, SEM, UV-Vis, and transient absorption spectroscopy.
5：Data Analysis Methods:
TA intensity was evaluated as %Abs. = 100(R0-R)/R0, where R0 and R were diffuse reflected probe light intensity without and with excitation, respectively.
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