Abstract: In this seminar, fabrication of monolithic suspended carbon nanowire-based structures including single nanowire and nanomeshes, and their applications as electrochemical/gas/bio-sensors are introduced. The suspended carbon structures are fabricated using the carbon-MEMS process consisting of conventional UV-lithography and pyrolysis which accompanies significant volume shrinkage resulting in the formation of complex suspended carbon nanostructures (minimum wire diameter ~ 200 nm). The suspended carbon nanowires shows good robustness enough to be processed with photolithography and deposition; this enables patterning of functional materials in sub-micromenter scale without any nanofabrication technology related alignment issue. The single suspended carbon nanowires of 200-nm diameter can be  selectively coated with a thin palladium layer or ZnO nanowires which showed good gas sensing capability down to 20 ppm hydrogen gas and 50 ppm CO, NOx, H2 gases respectively. Combined with a substrate-bound carbon band electrode, the suspended carbon mesh showed high efficiency of redox cycling enabling highly sensitive sensing of dopamine and glucose.

Biography: Heungjoo Shin received his Bsc (1998) and MSc (2000) from the Department of Mechanical Design and Production Engineering in Seoul National University, and PhD (2006) from the Department of Mechanical Engineering in Georgia Institute of Technology. He worked as a postdoctoral fellow in the School of Chemistry and Biochemistry at the Georgia Institute of Technology from 2006 to 2008. He joined the School of Mechanical and Advanced Materials Engineering at the Ulsan National Institute of Science and Technology in 2009 as an assistant professor and is currently an associate professor in the School of Mechanical and Nuclear Engineering. His research interests include the development of SECM-AFM probes, carbon-nanostructure-based electrochemical sensors, biosensors, gas sensors, and micro/nanofabrication technologies.