| 초록 |
As interest in biomass materials for making wearable sensors increases considering environmental issues, cellulose coming from nature has been drawing attention as an environmentally-friendly wearable sensor material. This study is the first to amplify the piezoresistive properties by applying a 3D textile structure to a sensor made of carbonized cellulose fabric (CCF). By using the pre-strained monofilament of 3D textile as a pressure transmitter, the local strain in the CCF can be increased to expand the contact area between the CCF fibers, which improves the sensitivity by 9.6 times (32.13 kPa-1) at same pressure (3.35 kPa-1) and the operating range reached up to 100 kPa. Based on this excellent sensitivity, large joint motion (finger and knee joint motion, gait, 4-way movement of neck) and bio-signals (wrist pulse, speaking, breathing, etc.) were monitored in real time with a smartphone. |
