Fabrication of Organic Strain Gauge on Curved Surface by Direct Patterned Microcontact Printing for Nail Sensing

The organic flexible electronics is an attractive research that wearable human sensing device on human fingernails. Generally, the strain gauge for human sensing is formed on plastic films. Therefore, when fix the film sensor on curved surface such as human nails, it is difficult good contact. In this study, we proposed a process which form patterned film of PEDOT:PSS (Poly(3,4-ethylenedioxythiophene):Poly(4-styrenesulfonate)) on 3D curved plastic curved substrate by micro contact printing method. Moreover, we fabricated strain gauge on flexible polyimide substrate and measured static electrical characteristics. It enables to form patterned film on such as human nails and fabricate strain gauge directly. The results show that direct printed PEDOT:PSS films on curved surface can be used to strain sensor, which leads to monitoring human body by sensing of human nail anytime.