In recent years, based on the rapid development of multi-functional fiber material technology, more types of fibers have functions such as sensing, photoelectric conversion, energy collection and storage. With the increasing demand for fabric-type wearable electronic products, multi-functional fibrous devices and smart fiber fabrics provide a new solution for them. However, at present, the problems of accurate and efficient positioning, connection and assembly of various functional materials inside flexible fibers have hindered the large-scale application of fiber devices.
Recently, the Energy Storage Research and Development Center of the Institute of Engineering Thermophysics, Chinese Academy of Sciences has cooperated with Nanyang Technological University in Singapore to propose a new type of precise control technology for intra-fiber particles based on laser thermal effect, breaking through the solid characteristics of fiber materials that are not conducive to internal processing The precise movement and control of internal particles, assembling semiconductor hetero-functional structures, provides new ideas for the preparation of complex and efficient functional structures and devices in fibers.
In this study, the precise heating of carbon dioxide lasers was used to convert solid fiber materials into liquids, and a precisely regulated Marangoni heat flow was generated inside the fibers. The particles integrated in the fiber can change the position along with the heat flow of the fiber material, and can control the direction and speed of the particle movement by modulating the laser. This breaks through the problem that the inherent position of the substance in the solid fiber material cannot be precisely controlled, and makes it possible to construct more complex functional structural devices using the combination of substances in the fiber. The method proposed in this study uses fluid as a carrier to manipulate the particles, and has no selectivity for the structure, material, size, and number of particles. This feature greatly expands the scope of the method. Based on the above principles, a method for manufacturing homojunctions and heterojunctions by using semiconductor material particles in fibers is obtained, which proves the ease of use of the method and its application prospects in many fields such as photovoltaics, photovoltaics, thermoelectricity, and energy storage.
Related results were published in "Nature-Newsletter". The research was supported by the International Partner Program of the Chinese Academy of Sciences and the Clean Energy Pilot Project.
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