Name of the speaker: DING Jianning
Position:Professor                                   
Organization: Changzhou University
Nationality: China
 



The Title of Speech: Portable, flexible and stretchable electronics inspired nanomaterials and devices
Biography of the Speaker: Ding Jianning received his Ph.D degree in Mechanical Engineering from Tsinghua University, China, in 2001. He joined Jiangsu University between 1991-2007. He is a Research Fellow in City University of Hong Kong from 2002 to 2003. His current position is a Professor and Vice President of Changzhou University. He is the Director of Center for low-dimensional materials, micro-nano devices and system; Director of Jiangsu Collaborative innovation center of "Photovoltaic science and engineering" in 2011; Director of Jiangsu Key Laboratory for Solar Cell Materials and Technology. His research areas cover the device technology and equipment research of new energy materials, low-dimensional materials, micro-nano devices and system, and Tribology. Above 400 academic papers and 7 books were published and 50 national invention patents were authorized in China. He is the Editorial in Sensors & Transducers Journal and Friction.
 Abstract of Speech: The development of portable, flexible and stretchable electronics is a tremendous challenge for traditional materials and fabrication methods. However, the certain structure combination and design may offer a potential way to solve the problem. In this talk, I will describe the design of electrical nano-materials to flexible energy storage devices.
Superelastic conducting fibers with improved properties and functionalities are needed for flexible and stretchable electronics. Here we report the fabrication of highly stretchable (up to 1320%) sheath-core conducting fibers created by wrapping carbon nanotube sheets oriented in the fiber direction on stretched rubber fiber cores. The resulting structure exhibited distinct short- and long-period sheath buckling that occurred reversibly out of phase in the axial and belt directions, enabling a resistance change of less than 5% for a 1000% stretch. By including other rubber and carbon nanotube sheath layers, we demonstrated strain sensors generating an 860% capacitance change and electrically powered torsional muscles operating reversibly by a coupled tension-to-torsion actuation mechanism. Based on Au nanograin decorated aligned multiwall carbon nanotube (CNT) sheets, the fabricated flexible linear solid supercapacitor exhibits an outstanding electrochemical performance with a total volumetric capacitance of ~6 F cm-3 at a scan rate up to 10 V s-1. Highly stretchable supercapacitors with high rate performance and stretching stability have been also fabricated using buckled linear electrodes made by wrapping PANI@Au@CNT sheet on elastic rubber fibers.