报告题目：Soft, Spongy, and Conductive Materials as Highly Sensitive Strain/Pressure Sensors for Human Motion Monitoring
Department of Chemistry and Applied Biological Sciences， South Dakota School of Mines and Technology， Rapid City, SD, USA
Wearable systems consisted of conformable and lightweight biomedical/strain sensors, power sources, and wireless modules have broad application potentials in human motion monitoring, medical, human-machine interface, safety, and soft-robotics.Our research in this area focuses on combination of conductive nanofibers/polymers and soft scaffold materials (such as elastomers and hydrogels) to design multi-component and multi-functional composite materials. In this talk, I present our recent work on soft, spongy, and conductive materials as highly sensitive strain/pressure sensors for wearable human motion monitoring.Three-dimensional (3D) conductive sponge is assembled by freeze-drying of shortened electrospun nanofibers of polyacrylonitrile (PAN), polyimide (PI), and carbon. The sponge composed of these electrospun nanofibers is ultralight with hierarchical pores; under compressive strain, the resistance change of the 3D conductive sponge shows high sensitivity and stability over a wide range of compressive strain.Highly flexible and compressible conductive sponge is also prepared by one-step dip coating the commercial melamine sponge (MS) in an aqueous dispersion of poly(3,4-ethylenedioxy thiophene):poly(styrenesulfonate) (PEDOT:PSS).Due to the interconnected porous structure of MS, the conductive PEDOT:PSS@MS has high compressibility and stable piezoresistive response at the compressive strain up to 80%, as well as good reproducibility over 1000 cycles.Versatile pressure sensors fabricated using these conductive sponges are attached to the different parts of human body; the capabilities of these devices to detect a variety of human motions including speaking, finger bending, elbow bending, and walking are evaluated.Furthermore, prototype tactile sensory array based on these pressure sensors is demonstrated.
朱正涛博士现任职于南达科他矿业理工学院（South Dakota School of Mines and Technology）。他分别于1992年和1995年取得复旦大学高分子材料的学士和硕士学位，于2002年在美国纽约州立大学（the State University of New York at Binghamton）取得材料化学博士学位，之后在康奈尔大学（Cornell University, 2002-2004）和伊利诺伊大学厄巴纳-香槟分校（University of Illinois at Urbana-Champaign, 2004-2006）从事博士后研究。朱博士于2006年开始在南达科他矿业理工学院任助理教授，并于2012年进升具有终身教职资质的副教授（Tenured Associate Professor). 主要的研究方向是纳米材料和器件在能源的转换和储存，柔性电子器件，化学传感器等方面的应用，共发表论文60余篇，相关研究获得美国自然科学基金、美国航天局和美国化学会等机构的资金支持。