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Nam-Jung Kim
Prof. Nam-Jung Kim
University of Missouri-Columbia, USA
Graphene would prevail as an ideal material for practical SERS substrates?
In this talk, I will present overview of recent development of graphene-enhanced Raman spectroscopy (GERS) and discuss potential applications across a variety of scientific fields. For practical uses, GERS sensing ability should meet all the standards such as sensitivity, reliability, durability, and uniformity as is the same for metal-based surface-enhanced Raman spectroscopy (SERS). Graphene has an intrinsic advantage to hold the reliability, durability and uniformity because of its atomically flat surface and mechanical strength. With no plasmonic excitation or electromagnetic enhancement on the graphene, only chemical enhancement will give rise to SERS signals normally by one or two orders of magnitude. Thus, graphene as a SERS substrate would be ideal for studying chemical enhancement mechanism isolated from the commonly dominant electromagnetic enhancements. On the other hand, in order to increase the sensitivity reaching a single molecule level, reproducible activation of electromagnetic hotspots without compromising the benefits from graphene may be needed. There have been several methods to combine graphene with other SERS-active materials or modify the graphene substrates for enhanced performance. Recent efforts to make graphene-plasmon hybrid SERS systems will be exploited and followed by further discussion on the future direction of GERS.
Nam-Jung Kim, Assistant Professor, He received his Ph.D. from Department of Physics and Astronomy at UNC-Chapel Hill. After his postdoc training in quantum computing lab at Case Western Reserve University, he moved to work as lecturing professor at Konkuk University, Seoul for three years. He returned to USA to accept assistant research professor at University of Missouri-Columbia. At MU, his research focused on nanophotonics, plasmonics, and metallic nanoparticles and publishedmore than dozen research papers in high-impact journals investigating surface enhanced Raman spectroscopy (SERS) and nanoscale self-assembly phenomena. One of his research papers related to toxicity of silver nanoparticles got more than 500 citations since 2008.He was also interested in examining crystalline conducting polymer nanowires for developing organic electronic devices. He is currently working on graphene based hybrid light emitting devices while collaborating with researchers at Seoul National University and Korea Military Academy.He has served as a peer reviewer in many journals and contributed toacademic seminars and international conferences as an invited speaker. He is a member of American Physical Society, Materials Research Society, American Chemical Society, Optical Society of America, and Korean Physical Society.
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