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    Home > Pure cotton fabric becomes wearable electronic device

    Pure cotton fabric becomes wearable electronic device

    • Last Update: 2016-12-10
    • Source: Internet
    • Author: User
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    China is one of the countries that planted cotton earlier in the world Pure cotton fabric is one of the most popular clothing fabrics It is not only rich in production, affordable, but also comfortable to wear So, is it possible to make pure cotton fabric serve for the future wearable intelligent devices and virtual reality technology? Recently, Zhang Yingying's team of Tsinghua University prepared a high-performance flexible strain sensor by treating pure cotton fabric at high temperature In recent years, more and more attention has been paid to health and medical detection, and intelligent wearable electronic devices have become a hot spot of scientific research It has become an important trend to pursue large-scale, green, low-cost and high-performance flexible electronic devices Flexible wearable strain sensor is an important part of flexible electronic devices, which has important application value in human motion detection, medical health and other fields At present, the materials of wearable strain sensors are mainly based on metal nanowires, nanofilms, graphene, carbon nanotubes and other substances There are many constraints such as complex preparation methods, high cost and potential toxicity In addition, it is worth noting that the current reported flexible strain sensor is difficult to have a large detection range and high detection sensitivity, which limits its application in human body full-scale strain detection The soft strain sensor based on cotton fabric developed by Tsinghua University team has made up for the above shortcomings As we all know, cotton can be woven into all kinds of woven fabrics after twisting However, cotton fabric is not conductive, so it can not be used in electronic devices They can transform cotton fabric into carbon fabric with high conductivity by program-controlled high temperature treatment, and the material obtained has multi-level structure (graphitization microcrystalline micron fiber macro weave structure) The flexible electronic device can be prepared by embedding it in the flexible polymer For example, the carbon fabric based flexible device made of plain cotton fabric can form a uniform whisker like "antennae" structure in a certain direction under stress These "antennae" can be contacted and separated in the process of repeated application and release of stress, causing the change of resistance, so that the stress can be detected sensitively It is noteworthy that the "antennae" conductive structure enables it to detect tiny strain as low as 0.02% and can sensitively (127.6 kPa 1) perceive light to 0.3 mg foam particles The obtained strain sensor has a strain detection range of more than 140% and shows excellent sensitivity (sensitivity coefficient reaches 24 and 64 respectively in the strain range of 0-80% and 80% - 140%) The device also has excellent performance in repeatability, stability and hysteresis With its excellent performance, the sensor can be used to detect the deformation caused by the weak physiological signal of human body, such as pulse, heart rate, speech recognition, facial micro expression recognition, etc.; it can also be used to detect the large strain of human joint movement, such as motion detection, hand movement recognition, etc In view of its simple and green preparation method and excellent performance, the cotton based flexible wearable strain sensor is expected to be widely used in health and motion monitoring, human-computer interaction, virtual reality and other fields, so as to serve the development of wearable devices This achievement was recently published in advanced functional materials The first authors of this article are Zhang Mingchao and Wang Chunya, doctoral students of Tsinghua University.
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