[China Instrument Network Instrument Development] From smart socks to sportswear that measures motion, wearable sensors are becoming the latest "required" technology. Now, scientists report that they use silk as a cutting-edge material and will develop a more sensitive and flexible new generation of multi-functional devices to monitor a large number of human functions in real time.
At present, the possibility of silk sensors is very high. Silk is an ideal material for making human sensors. They will be used as an integrated wireless system that allows doctors to remotely monitor patients more easily so that they can respond to their medical needs more quickly than ever before. .
Body sensors, which are commonly fabricated with semiconductors, have shown great potential for monitoring human health. But they have limitations. For example, strain sensors that measure force changes cannot have both high sensitivity and high stretchability. Silk is a stronger natural material than steel, more flexible than nylon, and it can overcome these problems. This fiber is also light and biocompatible. However, silk does not conduct electricity well. In response to this challenge, Prof. Zhang Xin and his colleagues at Tsinghua University tried to find a way to improve the conductivity of silk for successful application on body sensing devices.
The researchers decided to try two different strategies. In the first method, they processed the silks in an inert atmosphere at a temperature between 1112 and 5432 Fahrenheit. As a result, this silk is doped with nitrogenous carbon and some graphitized particles that are electrically conductive. Using this technology, scientists have developed strain sensors, pressure sensors, and a dual-mode sensor that can simultaneously measure temperature and pressure.
In the second method, the research team feeds graphene or carbon nanotubes to silkworms. Some of these nanoparticles are naturally absorbed into the silk produced by the worm. So far, this method has not produced conductive fibers, but researchers are still experimenting with this technology and hope to make it work.
Based on the preliminary results, Professor Zhang Xin wants to explore how to create a silk-based, self-sufficient sensor that will be powered by nanogenerators. She also stated that the silk sensors developed by her team may be used to create more realistic robots that can sense tactile sensation, temperature or humidity, and can even distinguish the sound of different people.
(Original title: Researchers report that silk can increase the sensitivity and flexibility of wearable device sensors)
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