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Previously, scientists have developed a variety of smart skins that mimic the tactile feedback of human skin through built-in sensors, so that amputees feel the pressure, temperature, or even humidity, but how can these futuristic materials be powered? Recently, a research team from the University of Glasgow in the United Kingdom has successfully developed a solar version that can provide more lasting and more efficient power supply than traditional batteries or cable connections.
In the test case, the team of engineers installed a layer of photovoltaic cells on the back of a robot, while other built-in sensors were fabricated from graphene materials. The team wrote in the research report: "The touch-sensitive layer is transparent. This is mainly because the photovoltaic cell can absorb light energy efficiently."
The team then performed various exercises on the robot arm, such as grabbing soft objects, etc. The solar cells could provide the physical feedback. Low-power skin typically requires 20 nanowatts of electricity per square centimeter, which is equivalent to the output capacity of current minimum capacity photovoltaic cells. Although the electricity generated by the photovoltaic power supply on the skin cannot be stored, the team of engineers is exploring how to transfer unused energy to the battery so that it can be used when needed.
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