December 7, 2021

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Surprising discovery: Scientists discover a substance that changes shape under light: What uses can it have?

The ultrafast laser spectrometer enables the observation of the motion of atoms on their natural time scales. Atoms move very fast, femtoseconds, i.e. 10-15th Again, the gate writes SciTech Daily. Using it, they discovered a special substance.

Scientists have combined this method with electron microscopy, which helps scientists determine the spatial resolution of an atom. By combining the observation of electrons and photons in one instrument, Professor Peter Bohm was able to build the world’s fastest electron microscopes. Thanks to them, we can look in detail at different materials and find out What dynamics are you working within?

Recently, Baum and colleagues published a study that looked at two-dimensional molecular sheets called MXeny. Their work brought a truly surprising discovery. Using laser pulses, scientists were able to change the shape of these leaves, from perfectly straight to wavy.

Source: University of Constance

MXens are manufactured by “peeling off” a thin film Material A process called exfoliation. It can be MXeny Easily produced in large quantities, Thanks to chemical peel methods that are easily adaptable but irreversible.

“McSene are similar in one of the spatial dimensions of the molecule, but in the other two dimensions we can compare them to the solid,” said Dr. Mikhail Volkov.

change material

In the new work, the researchers studied the properties of MXenes in this way They shone with fast laser pulses. As a result, they found a way to improve the properties of this material. Thanks to modern microscopes, they were able to capture the movement of this thin layer over a period of one femtosecond. MXens can handle the effect of a laser or curl, while they can also control the shape of the leaf curl.

“We can control the direction of the nanowave using the polarization of the laser. This means that the material has a form of optical memory that manifests itself at the nanoscale. But what is more, if the laser hits the MXene sheet again, the layer changes from corrugated to flat again The very small area of ​​the nanofibers and the fast interaction are also surprising. We believe that this may be due to a phenomenon called plasmon-phonon interconnection”, explains Mikhail Volkov.

The nanostructure in the form of waves can increase the percentage of surface content of different materials. In other words, due to this phenomenon, different substances are more reactive. At the same time, there is an improvement in the local electromagnetic fields, Thanks to materials that are more reactive to light. Thanks to this feature, this object fits different sensors.

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Researchers currently expect the discovered MXena to have greater potency as well as better antibiotic properties. In addition to the possibility of changing the shape of this structure practically upon request, It opens up more possibilities for scientists. They claim that similar layers can be used in chemical or electrically active devices.

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