Wearable
electronics containing different functional sensors with
abilities to meet people’s daily needs are highly desirable.
Here, a stretchable triboelectric nanogenerator (TENG) for wearable
electronics is demonstrated. By stacking two layers of silicone rubbers
embedded with silver nanowires (AgNWs) and a Ni foam as electrodes,
respectively, the fabricated TENG can serve as a new type of sensor
that is wearable, stretchable, skin-friendly, noninvasive, and durable.
It can convert mechanical deformation into electric signals. Deformation
like stretching and extruding of the TENG results in interlayer rubbing
because of inhomogeneous strain, producing triboelectric charges that
can induce voltage signals in the electrodes in response to the deformation.
On the basis of the principle, a joint sensor based on the TENG is
demonstrated, which can generate different output voltages according
to the bending degrees of the joint. Furthermore, a three-dimensional
sensor integrating three TENGs is fabricated to depict the deformations
of different muscle areas. The output voltages of the three TENGs
can be simultaneously monitored to reflect the deformation degrees
of different muscle areas.
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