The invention belongs to the technical field of friction
electricity generating and in particular relates to a stretchable coaxial fibrous friction
electricity generating and sensing device and a preparation method thereof. The preparation method comprises the following steps: utilizing macromolecular materials of different
dielectric constants as a friction
electricity generating layer and an oriented
carbon nanotube film as a charge inducing and collecting
electrode; firstly swathing the oriented
carbon nanotube film on a fibrous macromolecular
elastic substrate to be taken as an inner-layer
electrode, then sequentially constructing two macromolecular friction generating
layers with micro-nano structures on the contact surfaces on the surface of the
carbon nanotube film, then swathing a carbon
nanotube film layer to be taken as an outer-layer
electrode, and finally encapsulating, so that the stretchable coaxial fibrous friction electricity generating device is obtained. The device is simple in preparation process, has good flexibility and respectively can produce an
electric signal under the actions of stretching, bending, compressing and twisting, so that
mechanical energy in different directions and different forms in an external environment can be collected and converted into
electric energy; and the device can be taken as a power supply for supplying power to wearable
electronic equipment and also can be taken as a sensing device for detecting motion and physiological signals of a
human body.