Research On Preparation And Performance Of Printed Bending Sensor Based On Carbon-based Composite Material

This paper uses carbon black,graphite,graphene and other carbon pastes,mixed with resins and additives to make printable inks.The effects of different components,additives and preparation processes on the bending sensor ink are studied through the ratio adjustment,the comparison of the effect of the additives,the optimization of the sintering temperature,the number of grindings and other conditions.Based on this research,two bending sensors with different mechanisms are designed.Different from the existing optical-based bending sensors,the sensors designed in this paper are mainly resistive bending sensors prepared based on the crack structure design and the microstructure enhancement mechanism of the composite material interface.The working principle of the first sensor is to make the functional layer crack when subjected to bending stress through material formulation and process adjustment.the conductive network part is broken to increase the overall resistance of the device,and the reversible disconnection and connection due to the crack are extremely large.Thus,the sensitivity of the device is improved.The sensor resistance and the bending angle are linear within 0-90°,the linear equation is y=0.07509x+2.39091,and the correlation coefficient is R=0.98421.The stress bending angle measured by the sensor can be measured more accurately.The working principle of the second type of sensor is to attach the force-sensitive sensing ink layer to the interdigital electrode through the structural design.When the ink layer is bent,the contact area between the ink layer and the electrode increases.The conductive channels increase,and the device resistance decreases.The sensor resistance and the bending angle are linear within 0-90°,the linear equation is y=-1.61242x+154.82909,and the correlation coefficient is R=0.97779.In addition to measuring the bending angle,the sensor can also detect the pressure of vertical loading.The sensor resistance and pressure are linear in the range of 0-160 N when the force is applied.The linear equation is y=-2.68514x+189.62857,and the correlation coefficient R=0.98902.The two bending sensors designed in this paper are prepared by screen printing,which have the advantages of mass manufacturing,environmental protection and low cost.It has huge application potential in industrial manipulator control and monitoring as well as human joint and bone health management.