Wearable Strain Sensor Based on Carbonized Nano-Sponge/Silicone Composite for Human Motion Detection
Melamine sponge, also named as nano-sponge, is widely used as abrasive cleaner in our daily life. In this work, the fabrication of wearable strain sensor for human motion detection is first demonstrated with commercial available nano-sponge as starting material. The key resistance sensitive material in the wearable strain sensor is obtained by encapsulation of carbonized nano-sponge (CNS) with silicone resin. The as-fabricated CNS/silicone sensor is highly sensitive to strain with a maximum gauge factor of 18.42. In addition, the CNS/silicone sensor exhibits fast and reliable response to various cyclic loading within a strain range of 0-15% and a loading frequency range of 0.01-1 Hz. Finally, the CNS/silicone sensor as wearable device for human motion detection including joint motion, eye blinking, blood pulse and breathing is demonstrated by attaching the sensor to corresponding part of human body. In consideration of the simple fabrication technique, low material cost and excellent strain sensing performance, the CNS/silicone sensor is believed to have great potential in the next-generation of wearable devices for human motion detection.