Construction of Flexible Strain/Temperature Sensors with Dual Conductive Networks and Application in Health Monitoring
In order to solve the problem that it is difficult to balance the wide strain sensing range and high sensitivity of smart wearable flexible sensors,a ribbon fiber with a dual conductive network structure was prepared as a flexible strain/temperature sensor in one step by using a wet coaxial spinning method.The carbon nanotubes in the core axis diffuse into the polyurethane in the sheath axis during the non-solvent phase separation process,leading to the formation of a conductive network of carbon nanotubes embedded in the polyurethane,which constitutes a dual conductive network with the carbon nanotubes conductive layer in the core axis,and the polyurethane as the sheath axis to provide stretchability and protection.This dual conductive structure achieves low initial resistance(387 Ω),wide strain sensing range(sensing ε=425％),and high sensitivity(ε=0％-200％,GF=208.8;ε=200％-425％,GF=1359.2),and it can also keep the relative resistance as a flexible sensor basically unchanged after 12,500 repetitions at 0％-20％strain.It can also be used as a flexible sensor to keep the relative resistance almost unchanged after 12500 repetitions at 0％to 20％strain.In addition,the flexible sensor also has temperature sensing function(TCR=-0.240％/℃)and corrosion and water washing resistance,which has a wide range of prospects in the field of smart wearable devices.
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维普
