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Photo-Switchable Nanoripples in Ti3C2T MXene.
Mikhail Volkov1,2, Elena Willinger3, Denis A Kuznetsov3
1University of Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany.
ACS Nano
|August 31, 2021
Summary
Titanium carbide (Ti3C2) nanosheets exhibit rapid structural changes upon laser excitation. These two-dimensional materials transform into a photo-switchable metamaterial with tunable nanoripples, impacting their optical and electronic properties.
Area of Science:
- Materials Science
- Nanotechnology
- Physical Chemistry
Background:
- Two-dimensional materials like MXenes possess unique optical and electromagnetic properties.
- Understanding light-matter interactions at ultrafast timescales is crucial for advanced applications.
Purpose of the Study:
- To investigate the laser-induced structural dynamics of Titanium carbide (Ti3C2) nanosheets.
- To explore the transformation of MXenes into metamaterials under femtosecond laser irradiation.
Main Methods:
- Ultrafast electron diffraction
- High-resolution electron microscopy
- Femtosecond laser excitation
Main Results:
- An exceptionally fast electron-phonon coupling time of 230 fs was observed.
- Ti3C2 nanosheets transformed into a metamaterial with sub-wavelength nanoripples.
- The material demonstrated reversible photo-switching between flat and rippled states.
Conclusions:
- Laser-induced nanostructuring creates a switchable MXene metamaterial.
- The nanostructured MXene exhibits anisotropic optical and electronic properties.
- Tunable chemical activity can be achieved through light-induced morphological changes.
Keywords:
2D materialsLIPSSMXenefemtosecond lattice dynamicsnanoripplesstructural transitionultrafast electron diffraction
