Highly stretchable and bio-based sensors for sensitive strain detection of angular displacements
Flexible and electrically conductive hydrogels were fabricated by incorporating carboxylic multiwall carbon nanotubes (c-MWCNTs) into bacterial cellulose (BC) membranes by electrostatic self-assembly using bovine serum albumin (BSA). A piezoresistive strain sensor assembled by c-MWCNTs/BSA/BC hydrogel exhibited 70% stretchability and excellent cycling stability. It was able to accurately detect diverse large-scale human motions, including finger knuckle, wrist bending, knee joint, and elbow joint. The eco-friendly BC provided an inexpensive and renewable substrate for flexible strain sensors.
KeywordsBacterial cellulose Relative resistance change Strain sensors Angular displacements Human motion detection
This research was financially supported by the national first-class discipline program of Light Industry Technology and Engineering (LITE2018-21), the Natural Science Foundation of Jiangsu Province (BK20180628), the National Science Foundation of China (51803078), 111 Project (B17021), the Fundamental Research Funds for the Central Universities (JUSRP11701), the Priority Academic Program Development of Jiangsu Higher Education Institutions, Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (PPZY2015B147).