Woodruff School of Mechanical Engineering

Faculty Candidate Seminar


Building Up Nanomaterials for Flexible Nanodevices and Nanobiotechnology


Dr. SungWoo Nam


University of California, Berkley


Thursday, February 2, 2012 at 11:00:00 AM


MARC Building, Room Auditorium


Dr. Peter Hesketh


Flexible bottom-up assembly and integration of nanoscale materials with tunable composition and structure can provide a new paradigm for the development and advancement of novel fabrication strategies and unconventional integrated devices/sensors not previously achievable with top-down approaches. In this talk, I will present contact-printing assembly and integration of semiconducting nanowires (NWs) for flexible electronics and biosensor arrays, and monolithic integration of graphene-graphite for flexible bioprobes and integrated graphene devices. In the first part of my talk, I will discuss the assembly of highly-ordered NW arrays by contact-printing with well-controlled shear mechanism between growth and target substrates. The capability of uniform and patterned, automated contact-printing from single chip to a 4-inch wafer scale will be presented, and the strength of our assembly approach is further demonstrated by the creation of NW electronics and biosensor arrays. I will first show multilayer assembly of semiconducting NWs for 3D, multi-functional electronics. In addition, the development of nanoelectronic circuits based on individually assembled nonvolatile NW transistor arrays will be described, demonstrating advanced device functions with programmability. The versatility of the assembly method is supported by the large-scale, complementary SiNW biosensor arrays capable of simultaneous, multi-channel detections with femtomolar sensitivity for cancer diagnostics. The second part of my talk covers the monolithic integration of graphene-graphite to realize flexible, electrically-active bioprobes, and a single-step synthesis of monolithic graphenegraphite structure to enable the integration of a whole circuit. These monolithically-integrated graphene-graphite bioprobes exhibit mechanical flexibility and robustness and were integrated onto the tip of micropipette as a fully-functional, stand-alone probe platform. Furthermore, a novel synthesis approach to build monolithically-integrated electronic devices with graphenegraphite will be introduced. Complex geometries of graphene device arrays with graphite interconnects are achieved from single-step synthesis of graphene-graphite, exhibiting superb mechanical flexibility and optical transparency. Finally, ongoing research topics in optoelectronics (nanophotonic graphene transistor) and nanobiotechnology (plasmonics for enzyme dynamics and graphene-cell interface) will be discussed.


SungWoo Nam earned a B.S. degree in Materials Science and Engineering from Seoul National University, South Korea, in 2002, where he graduated summa cum laude with the Valedictorian Prize, ranked 1st in the School of Engineering. Following three years of industry experience in carbon nanotube technology, he obtained his M.A. in Physics (2007) and Ph.D. in Applied Physics (2010) from Harvard University under Professor Charles M. Lieber, with a focus in the areas of nanotechnology, including fully-integrated electronic devices and flexible bioelectronics for nanobiotechnology. Following the completion of his Ph.D., he has been working as a postdoctoral scholar at the Department of Bioengineering of the University of California, Berkeley with Professor Luke P. Lee focusing on nanoplasmonic detection of biomolecules, nanophotonic transistor and graphene-cell interface studies. His research interests include Nanodevices, Nanobiotechnology and Nanobiophotonics. He was the recipient of the Gold Award of the Material Research Society (MRS), Outstanding Student Designer Award at International Solid-State Circuits Conference (ISSCC), Certificate of Distinction in Teaching and Merit Fellowship from Harvard University, and the Samsung Scholarship.