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Photo-Switchable Nanoripples in Ti3C2Tx MXene

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2021

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Willinger, Elena
Kuznetsov, Denis A.
Müller, Christoph R.
Fedorov, Alexey

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ACS Nano. ACS Publications. 2021, 15(9), pp. 14071-14079. ISSN 1936-0851. eISSN 1936-086X. Available under: doi: 10.1021/acsnano.1c03635

Zusammenfassung

MXenes are two-dimensional materials with a rich set of chemical and electromagnetic properties, the latter including saturable absorption and intense surface plasmon resonances. To fully harness the functionality of MXenes for applications in optics, electronics, and sensing, it is important to understand the interaction of light with MXenes on atomic and femtosecond dimensions. Here, we use ultrafast electron diffraction and high-resolution electron microscopy to investigate the laser-induced structural dynamics of Ti3C2Tx nanosheets. We find an exceptionally fast lattice response with an electron-phonon coupling time of 230 fs. Repetitive femtosecond laser excitation transforms Ti3C2Tx through a structural transition into a metamaterial with deeply sub-wavelength nanoripples that are aligned with the laser polarization. By a further laser illumination, the material is reversibly photo-switchable between a flat and rippled morphology. The resulting nanostructured MXene metamaterial with directional nanoripples is expected to exhibit an anisotropic optical and electronic response as well as an enhanced chemical activity that can be switched on and off by light.

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530 Physik

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MXene, 2D materials, ultrafast electron diffraction, nanoripples, LIPSS, structural transition, femtosecond lattice dynamics

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ISO 690VOLKOV, Mikhail, Elena WILLINGER, Denis A. KUZNETSOV, Christoph R. MÜLLER, Alexey FEDOROV, Peter BAUM, 2021. Photo-Switchable Nanoripples in Ti3C2Tx MXene. In: ACS Nano. ACS Publications. 2021, 15(9), pp. 14071-14079. ISSN 1936-0851. eISSN 1936-086X. Available under: doi: 10.1021/acsnano.1c03635
BibTex
@article{Volkov2021-09-28Photo-54789,
  year={2021},
  doi={10.1021/acsnano.1c03635},
  title={Photo-Switchable Nanoripples in Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene},
  number={9},
  volume={15},
  issn={1936-0851},
  journal={ACS Nano},
  pages={14071--14079},
  author={Volkov, Mikhail and Willinger, Elena and Kuznetsov, Denis A. and Müller, Christoph R. and Fedorov, Alexey and Baum, Peter}
}
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