Graphene-Based E-Skin Detects Vibrations From Audio To Ultrasound

Graphene-Based E-Skin Detects Vibrations From Audio To Ultrasound - Featured Sensors Uncategorized
Researchers from Nanjing University have developed a flexible force sensor consisting of a 3D foam encapsulated into flexible polydimethylsiloxane (PDMS), capable of detecting mechanical stress from vibrations in the audio to ultrasound frequency range.

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.

Graphene-Based E-Skin Detects Vibrations From Audio To Ultrasound - Featured Sensors Uncategorized
A SEM image of the graphene foam shows
its 3D morphology and structure.

 

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.

The full story is available below.

Source: eenews Europe


Graphene-Based E-Skin Detects Vibrations From Audio To Ultrasound - Featured Sensors Uncategorized
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