Ultrafast Transient Spectra and Dynamics of MXene (Ti3C2Tx) in Response to Light Excitations of Various Wavelengths
2020
The
novel optical response properties of MXene (Ti3C2Tx) have been applied in many cutting-edge areas, such as
solar utilization, laser therapy, and sensing. Understanding the interaction
between photons and MXene is critical to all these applications. However,
the ultrafast carrier pathway of this material under broad-wavelength-range
light excitation remains unknown. In this work, we conducted a comprehensive
ultrafast spectroscopy study of MXene under light excitation at various
wavelengths. With the combination of ultrabroadband transient spectra
(450–1100 nm) and dynamics, we provided schemes for the MXene–light
interaction. The transient spectra showed that light excitation in
the ultraviolet to near-infrared ranges could induce two transient
absorption regions in the visible and near-infrared ranges. An early
stage fast relaxation transient spectrum at 100–400 fs is attributed
to an electron–electron interaction process. The dynamics in
the early stage could be affected by the modulation of the excitation
wavelength, the fluence, and the probe wavelength. In addition, the
thermal diffusion dynamic process is sensitive to the surroundings
and is nearly independent of the excitation wavelength and the fluence,
whereas temporal signatures depend linearly on the excitation fluence
and the absorption efficiency. Our results could improve the fundamental
understanding of MXene–sunlight interaction and applications.
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