New Technology: Graphene Sensors Allow Small Molecules to "Shape"

Although scientists are favored by the unparalleled nature of graphene, so far, its practical application is still poor. However, in the latest issue of Science, scientists at the Bio-Nanotechnology Laboratory at the Federal Institute of Technology in Lausanne (EPFL) in Switzerland and at the Photonics Research Institute in Spain claim they have exploited the unique optical and electronic properties of graphene to develop An ultra-high-sensitivity molecular sensor that can probe details of small proteins or drugs.

In the standard detection method of infrared absorption spectroscopy, light is used to activate molecules. Different molecules vibrate differently, by which the molecules show their presence or even their "character." These "clues" can be "reflected" in the reflected light. However, this method performs poorly when it comes to detecting nano-sized molecules. Because the wavelength of the infrared photons that irradiate a molecule is about 6 microns and the target molecule is only a few nanometers, it is difficult to detect the vibration of such tiny molecules in the reflected light.

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In addition, this process also reveals the properties of the atomic bonds of the constituent molecules. The researchers said that when a molecule vibrates, the atomic bonds that connect different atoms produce a variety of vibrations, with nuances of different vibrations that provide information about the properties of each of the keys and the health of the entire molecule. In order to find out the "sound" emitted by each atomic bond to determine all the frequencies, graphene is required. In the experiment, researchers applied different voltages to graphene to "tune" it to different frequencies to "read" all the vibrations of the molecules on its surface, something the current sensor could not do. Researcher Heidi Si 侔 green 馗 袼 Bodhisattva Qiu Yi Qiao Han saddle words side banter ┥ Xi? ⒂ mystery 庖 ring pepper ǎ? ? / span>

The simple method, the researchers said, shows that graphene has incredible potential in the field of detection, Otegger said. "Although we are working on biomolecules, this approach may also apply to polymers and other substances."

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