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Silver Nanowires Deposited on Grooved Surface as Bendable Resistance Sensor

In this paper, we present a simple bendable resistance sensor with silver nanowires (AgNWs) stripe coated on microgroove surfaces formed on a polyimide (PI) film. We adopted an anisotropic wetting manner to form a narrow stripe in order to improve the sensitivity of the resistance sensor. The ultraviolet (UV)-curable polymer NOA61 is firstly drop-coated on the substrate, and then imprinted by a groove-textured poly (dimethylsiloxane) (PDMS) template. After UV irradiation and de-molding, the surface is further treated with a UV-ozone (UVO) lamp, so that the grooved surface becomes more hydrophilic, which will promote the anisotropic wettability of AgNWs suspension and thereby deposition of AgNWs into uniform multi-layer stripe pattern. Moreover, the conductance with respect to the bending motion is measured. The most variation of conductance ΔG/G0 can reach about 200 % with bending radius of 2 mm.