Retractable solar cells power artificial skin
Researchers at Stanford University (Zhenan Bao) are studying the creation of a "superartificial skin" that can sense stress and a variety of molecules, and this artificial skin is powered by a flexible solar cell. . Until now, the sensor on the artificial skin that Baozhan Nan researched and manufactured can sense the landing of flies. Now she is increasing the ability of the skin to distinguish chemical substances and feel various biological molecules. In order to supply power to artificial skin, she uses a polymer solar cell, which is flexible, can be stretched by 30% on the basis of the original length, and can be restored to its original shape without causing any damage and power loss. This artificial skin is based on a flexible organic transistor that consists of flexible polymer and carbon materials. In order to be able to perceive the sense of touch, the transistor contains a thin, highly elastic rubber layer with a small inverted pyramidal structure. When compressed, the thickness of the rubber layer changes, and the current flowing through the transistor also changes. This layer of sensors (referred to as the rubber layer) contains tens of thousands of pyramids per square centimeter of tissue, even up to 25 million pyramids, so many pyramids are included in order to be highly sensible. The surface of the transistor is coated with a layer of molecules that can bind to the target molecule so that the transistor can sense chemical or biological molecules. Baozhan Nan's team successfully demonstrated this concept by testing a specific DNA. Researchers are now working hard to extend this technology to protein testing, which is helpful for medical diagnosis. Solar cells are light, flexible and provide the power to send sense data to the brain or computer. The researchers created the extended solar cell by following the steps of stretching a polydimethylsiloxane film and pressing the film onto a glass substrate, and then rotating the film onto a layer of polyethylene dioxygen. Thiophene (PEDOT:PSS), followed by a further layer of P3HT:PCBM, followed by a few drops of gallium indium mixture, and finally it was removed from the glass plate. The film will shrink automatically, resulting in some clasps, but the indium mixture meets the micro buckle on the film. Researchers published articles showing that the solar cells they made were very similar in their extended and non-extended state, and that these researchers also demonstrated that the cells could be stretched along two axes. Bao Zhe Nan believes that this kind of super artificial skin is not only a kind of super artificial artificial skin. This kind of counterfeit skin can also make robots or other instruments perform functions that cannot be performed on real human skin. She said: "You can imagine that the robot's hand can be used to touch a specific liquid to detect specific markers or specific proteins that are related to the disease, and then the robot will effectively report: 'This person has this disease' Or, the robot may touch the sweat left by the human body and say, 'Oh, this man is drunk.'" Darren, who is a postdoctoral researcher and chief author of the paper at Bao Zhenan's laboratory, said that the extendable solar cells also play a significant role in the production of clothes. He said: “We have parts of our body, such as the elbows, that stretch the skin and clothes when we are active. An instrument or clothing that is flexible but not stretchable and stretches with some of our body. Some parts of the machine or some stretching parts of the machine are likely to rupture when applied in combination. Applying solar cells to some curved surfaces shows the usefulness of its tensile properties, such as in automobiles, lenses, and buildings. The surface of the element is used.
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