2002 Ph.D. Mechanical Engineering, Tsinghua University, Beijing, China
1996 B.S. Mechanical Engineering, Tsinghua University, Beijing, China
Jan. 2009 ~ present Professor, Department of Materials Science & Engineering, Peking University, China
Aug. 2005 ~ Dec. 2008 Assistant Professor, Department of Mechanical Engineering, University of Hawaii at Manoa
Dec. 2006 ~Feb. 2007 & May 2006~June 2006 Visiting scholar, Department of Chemistry and Chemical Biology, Harvard University
2002 ~ July 2005 Post-doctoral researcher, Dept. of Materials Science & Engineering, Rensselaer Polytechnic Institute
1996 ~ 2001 Research Assistant, Department of Mechanical Engineering, Tsinghua University, China
Research Areas And Interests
1.One-dimensional nanostructures (carbon nanotubes, semiconducting nanowires): synthesis, characterization, and properties.
2.Nano-electronic and optical devices.
3.Super-strong nanofibers and nanocomposites.
4.Energy and environmental applications of nanotechnology (solar cells, water purification)
5.Micro- and Nano-electromechanical systems and flexible devices.
The overall objective of the research in our group is to understand basics of nanostructures and nanodevices, and explore potential applications of nanotechnology.
One-dimensional nanostructures such as nanotubes and nanowires have excellent mechanical, electrical and optical properties. Their properties are strongly related to the crystalline structure, diameter, length and surface functionalities. Therefore, synthesis of nanomaterials with controlled morphology and properties is essential for making high performance nanodevices and integrated systems. Our group is working on growth of carbon nanotubes in individual long tubes, thin films, arrays and yarns, and semiconducting nanowires and hybrid structures.
Assembly of nanostructures is an important step toward applications. We develop self-assembly methods to align nanotubes/nanowires over large area with tailored distribution. The blown bubble film technique can assemble a wide range of 1D nanomaterials, and might be scaled up for low-cost industrial production using blown film extrusion techniques.
We pursue applications in energy and environmental areas. Nanostructure-incorporated photovoltaics have been developed such as CNT-Si, graphene-Si, CNT- Si nanowire, CNT-CdSe nanowire, and polymer solar cells with CNT film as transparent electrodes. Current challenge is to further improve device efficiency while reduce cost. CNT sponges consisting of a 3D interconnected nanotube network show great flexibility, and strong absorption of organic molecules and oil. They can remove nanoparticles and organic contaminants from water like a filter, promising applications in environmental cleanup and water purification.
Awards And Honors
2008 The USA NSF Career Award
2008 Honor of the College of Engineering at the University of Hawaii.
2006 Guinness World Records “The Smallest Nanotube Brushes”.
2006 China Awards for Science and Technology, Natural Science Z-108-2-04.
2005 China Education Administration Award, Natural Science - 006.
2004 China National One-hundred Outstanding Doctoral Dissertation Award.