Abstract
We report on fully flexible and transparent piezoelectric touch sensors based on ZnO nanowires (NWs). Their piezoelectric properties are further enhanced by incorporating BaTiO3 into the capping layer on nanowires. Flexibility is improved by a highly transparent carbon nanotubes–silver nanowires electrode. A BaTiO3-based capping layer on ZnO nanowires demonstrates a large increase of the output voltage (∼3.3 V) from the touch sensor compared to the voltage (∼50 mV). Mechanical bending tests reveal that the BaTiO3-added capping layer did not show significant degradation in change of resistance. Our results suggest that the piezoelectric touch sensors are promising for next-generation flexible touch sensors, wearable, and rollable touch panels.
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