There is an increasing demand for wearable and flexible devices since they are facile to be integrated in human body or clothes. Especially, wearable strains sensors are needed for monitoring human motion in real time. In this research, we report a si...
There is an increasing demand for wearable and flexible devices since they are facile to be integrated in human body or clothes. Especially, wearable strains sensors are needed for monitoring human motion in real time. In this research, we report a simple process to fabricate colorimetric strain sensor that applied force results in human-eyes detectable color change. A polydimethylsiloxane (PDMS) stamp is pre-stretched then treated in plasma chamber to form periodic winkles on the stamp surface. Due to light diffraction on the winkles, PDMS stamps appear in a color at a fixed angle of view. The stamps shift from blue to red and become transparent when PDMS stamps are stretched. Moreover, the working range of sensor can be tuned by adjusting pre-stretched force. In addition, the effect of plasma treatment conditions on the profile of wrinkle patterns will be investigated. This real-time visual display of body motion strain sensors are highly potential for use in robots, and point of care applications.