Chinese Paper-cutting Inspired Topological Flexible Piezoresistive Pressure Sensor for Wearable Health Monitoring

Inspired by the traditional Chinese Paper-cuttings art, this paper develops a flexible piezoresistive sensor based on rhomboid topology. Non thermal cutting of carbon black polyethylene composite film is performed using high-frequency femtosecond laser to define the topological sensing unit. The resistance response sensitivity of the sensor to normal pressure can reach up to 17.5 kPa^-1. After series and parallel connection and packaging, loading a grain of raw rice onto the sensor topological unit can cause approximately 1.2% of the sensor response. The effective application of the topological sensor in human pulse waveform monitoring, finger joint bending and rapid finger tapping further demonstrates the great potential of Chinese Paper-cuttings inspired topologies in flexible electronic devices.