Tuesday – January 12, 2016
3:00 – 4:00 PM
UC San Diego // Jacobs Hall // 2nd Floor, Henry G. Booker Room 2512
Wearable device that matches the soft human body represents an important trend for bio-integration; the resulting search for pliable electronic materials calls for strategies to bridge the gap between hard and soft – among which advanced engineering of the geometry and architecture of materials presents unique opportunities. A prominent example of geometry engineering is that nanowires of piezoelectric oxides can act as a flexible energy source; their synthesis, properties and integration into energy harvesting devices will be discussed. For architecture engineering, the compressive straining of an elastic substrate can be used to fabricate previously inaccessible classes of 3D structures in monocrystalline materials. Conversely, rationally designed 2D geometries can buckle to form 3D layouts to accommodate tensile strain, resulting in unprecedented stretchability. This enables a series of device possibilities in stretchable electronics, including lithium ion batteries with record stretchability and integrated soft health monitoring systems.
Sheng Xu is currently an assistant professor in the Department of NanoEngineering at University of California, San Diego. He was a postdoctoral research associate in Frederick Seitz Materials Research Laboratory from 2011 to 2015 at the University of Illinois at Urbana-Champaign, where he developed advanced wearable electronic systems for healthcare and energy applications. He received his Ph.D. in Materials Science and Engineering from Georgia Institute of Technology in 2010, where his research focused on rational oxide nanowire synthesis, nanowire array based light emitting diodes and mechanical energy harvesters. He received his B.S. in chemistry and Molecular Engineering from Peking University in Beijing, China in 2006.