Detailing their findings in the Applied Physics Letters under the title “Flexible and wearable 3D graphene sensor with 141 KHz frequency signal response capability”, the researchers explain that since the band gap of graphene dynamically changes upon mechanical deformation, changes in its resistance can be monitored, making for an effective strain sensor.
They synthesized the three-dimensional graphene foam (3D GF) by CVD on a nickel (Ni) foam used as a template, with ethanol as the carbon source. After the formation of graphene over the nickel foam (at 900ºC), the cooled Ni/graphene composite was immersed in hydrochloric acid to remove the metal, leaving a highly porous and flexible 3D GF.
The researchers then wired the 200µm-thin 3D GF before embedding it into PDMS to obtain a rugged flexible and stretchable sensor.
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Source: eenews Europe
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