In the new work, the authors studied two-dimensional molecularly defined sheets called MXenes.
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MXenes are two-dimensional carbide sheetsor transition metal nitrides: they are arranged in the form of single layers several atoms thick. Such a fine structure can only be achieved by exfoliating one material into many small layers.
Unlike most other single-layer materials, MXene can be easily produced in large quantities thanks to the discovery of a scalable and irreversible chemical exfoliation method.
The chemical and physical properties of MXene cancustomize: they depend on the choice of transition metal. Therefore, the material can be used for sensing, energy storage, light collection and even antibacterial effects.
In a new study, the authors improved the propertiesMXene using fast pulses of light that they directed at the material. As a result, they found that laser energy is transferred to the atomic lattice in a record time - only 230 femtoseconds. The researchers also managed to control the orientation of nanowaves using laser polarization: this means that the material has optical memory at the nanolevel.
Moreover, if the laser is again pointed at the MXene, the material will again turn into a plane.
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