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The invention relates to a breathable, biodegradable, antibacterial and self-powered whole nanofiber electronic skin based on a friction nanogenerator

Time : 2020-09-01 Hits : 8

The invention relates to a breathable, biodegradable, antibacterial and self-powered whole nanofiber electronic skin based on a friction nanogenerator

As the largest organ of the human body, human skin not only has the basic functions of protection, secretion and respiration, but also is an important somatosensory system for the interaction and communication between human and the material world. In recent years, the development of bionic electronic skin has aroused great interest of researchers, and it has a wide range of applications in wearable personal health monitoring, intelligent prosthesis and robotics, human-computer interaction and artificial intelligence.

Based on different physical sensing mechanisms, electronic skin can be classified into piezoresistive, capacitive, piezoelectric and triboelectric types. Electronic skin detects and quantifies a variety of environmental stimuli, including temperature, humidity, pressure, vibration and touch, and converts them into real-time and visual electronic pulses. Friction power is a kind of using electrical contact with the coupling effect of electrostatic induction, precious common mechanical energy can be converted to electrical energy access to new energy technology, low cost, simple structure, convenient use, material choice, high conversion efficiency, etc. In the field of wearable power source and the power supply sensor has a broad application prospect, is the ideal choice for energy independence type electronic skin.

Flexibility, extensibility, sensitivity, adaptability and mechanical durability are the most common research directions of electronic skin at present, which are also relatively easy to realize. In recent years, in order to improve the comprehensive performance of electronic skin, the special functions of electronic skin, such as recyclability, self-healing, shape memory, electroluminescence and mechanical luminescence, have been studied gradually. Despite the continuous optimization and improvement of the above aspects, the comfort, safety and environmental protection of electronic skin have been neglected, which to a large extent hindering the practical application of electronic skin. Therefore, the electronic skin with ideal comfort and practicality must be breathable, biodegradable and antibacterial. Air permeability is an important performance to adjust the heat and humidity balance and realize the gas exchange between human body and the outside environment. However, most high-performance electronic skin USES membranes as electrodes or substrates, which can cause skin irritation and even inflammation and itching. In addition, the long-term contact between e-skin and human skin is a good medium for microbial growth, so antibacterial properties are important for e-skin to inhibit bacterial growth and prevent bacterial infection. In addition, most materials are not disposable, at the end of their useful life, may become e-waste, or even harm the human body or pollute the environment.

Recently, the research team of Beijing Institute of Nanometer Energy and Systems, Chinese Academy of Sciences designed a breathable, biodegradable, antibacterial and self-powered all-nanofiber electronic skin based on friction nanogenerator, which realized mechanical energy collection and self-driven sensing of human body physiology and joint motion signals. By poly lactic acid/glycolic acid copolymer (PLGA) and polyvinyl alcohol (PVA) nanofibers membrane respectively as electrification layer and the substrate and silver nanowires (AgNW) as an intermediary, formed with multi-layers staggered nanofibers network and a large number of three-dimensional structure of micro-nano holes based on the electronic skin friction power, be helpful for human body skin and the external environment of heat transfer. At the same time, the electronic skin has very good antibacterial properties, can effectively inhibit the growth of Escherichia coli and Staphylococcus aureus, and prevent bacterial infection. By changing the size and matching of biodegradable PLGA and PVA, the degradation cycle of the electronic skin can be adjusted to several days to several weeks. In addition, with a maximum output function of 130 mW /m2 and a voltage response sensitivity of 0.011 kPA-1, the electronic skin can realize real-time non-invasive self-powered monitoring of physiological signals (such as microexpressions, pulse, respiration and vocations) and joint movements (such as knuckles, elbows, knees and ankles) of the human body. This work provides an unprecedented research strategy for the development of practical multifunctional electronic skin. The results for "A breathable, biodegradable, antibacterial, and self - powered electronic skin -based on all - nanofiber triboelectric nanogenerators" title, published in Science Advances.

20200901110013_520

Structure design and composition characteristics of whole nanofiber electronic skin based on friction nanogenerator

20200901110052_724

Characterization of tensile, air permeability, and electrical output properties

20200901110122_610

Characterization of antimicrobial and biodegradable properties

20200901110141_498

Systemic physiological signals and joint movement monitoring


Science Advances (IF:12.804) Pub Date :2020-06-26,


DOI: 10.1126 / sciadv aba9624

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