The official website of Tufts University in the United States recently announced that researchers at the school have developed a transistor made of flax fiber. The fully flexible electronic devices made of these transistors can be woven into a fabric and worn on the skin, even (in theory ) It can be implanted in the body for surgical monitoring and diagnosis. Related results were published in the "American Chemical Society-Applied Materials and Interfaces" magazine.
The researchers said that the newly designed transistors can be made into simple, fiber-based logic circuits and integrated circuits. These circuits will replace the last remaining rigid components in many flexible electronic devices and be used in combination with fiber-based sensors to create fully flexible multiplexed devices. This fully flexible electronic device can realize various applications that adapt to different shapes and allow free movement without affecting the function.
Most current flexible electronic devices achieve flexibility by patterning metals and semiconductors into bendable "wavy" structures or using self-flexible materials such as conductive polymers to interact with the biological tissue (skin, heart and even brain tissue) embedded in them Adapt.
In the experiment, the researchers used a fiber-based transistor to create a simple small integrated circuit and connected it to a fiber-based sensor array to monitor sodium and ammonium ions (cardiovascular health, liver and kidney function) Important biomarkers) concentration changes.
An important innovation in this study is the use of electrolyte-infused gel as the material around the fiber and connected to the gate line. The gel is composed of silica nanoparticles, which can self-assemble into a network structure. The electrolyte gel can be easily deposited on the fibers by dip coating or quick wiping. Compared to solid oxides or polymers used as gate materials in classic transistors, electrolyte gels are elastic under tension or bending.
The researchers said that compared to electronic products based on polymers and other flexible materials, fiber-based electronic products have excellent flexibility, material diversity and the ability to produce without a clean room. In the future, fiber-based electronic diagnostic devices can be very thin, soft, and flexible enough to integrate seamlessly with the biological tissue they measure, so that patients can barely notice.
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