Professor & Director of Maryland NanoCenter
- Seoul National University (Korea), Chemistry, B.S., 1990
- Seoul National University (Korea), Physical Chemistry, M.S., 1992
- Seoul National University (Korea), Organic Chemistry, Ph.D., 1997
- 1997 – 1999 LG Semicon Inc., Nanolithography, Senior Research Engineer
- 1999 – 2002 University of Florida, Department of Chemistry, Postdoctoral Research Associate
- 2002 – 2008 Assistant Professor, University of Maryland, Department of Chemistry and Biochemistry
- 2008 – 2013 Associate Professor (Tenured 2008), University of Maryland, Department of Chemistry and Biochemistry
- 2013 – present Professor, University of Maryland, Department of Chemistry and Biochemistry, Affiliated at the Department of Chemical and Biomolecular Engineering and the Department of Materials Science and Engineering
- 2009 – present Invited Professor at the Graduate School of Nanoscience and Technology, KAIST (Korea Advanced Institute of Science and Technology), Korea
- 2009 – present Deputy Director, NEES DOE-Energy Frontier Research Center, University of Maryland
- 2018 Director of Maryland NanoCenter, University of Maryland
- Electrochemistry of heterogeneous nanomaterials for high power energy storage and ultrafast electrochromics.
- Transport, diffusion, and reaction properties of nanopores.
- Biosensors, nanoparticle toxicology, targeted drug delivery and chemical & biochemical separation.
Major Recognitions and Honors
- 2006 Outstanding Young Investigator Award, KIChE-US (Korean Institute of Chemical Engineers-United States) Chapter at 2006 AIChE national meeting
- 2007 Faculty Excellence Award – College of Chemical and Life Sciences, University of Maryland
- 2008 2007 Invention of the Year Finalist, University of Maryland
- 2010 2009 Invention of the Year, Outstanding Invention of 2009, University of Maryland
- 2015 2014 Invention of the Year, Outstanding Invention of 2014, “Nanopore Battery”, University of Maryland
- 2017 – 2018 Associate Chair of Graduate Studies, Department of Chemistry and Biochemistry, University of Maryland
Significant Professional Service and Activities
- 2007 – 2008 Guest Editor of Nanomedicine for a special focus issue, “Nanoparticles for Cancer Diagnosis and Therapeutics”.
- 2010 – Editorial Board Member of Nanomedicine
- 2010 – 2011 Guest Editor of Nanomedicine for a special focus issue, “Nanotoxicology”.
- 2010 – Editorial Board Member of Science of Advanced Materials.
- 2013 – Editorial Board Member of Batteries
- 2012 – 2014 Founding Chair of Electrodeposition Division, Korean Electrochemical Society (KECS)
- 2012 Science Committee of the 44th International Chemistry Olympiad
Materials, Electrochemistry, and Bio-Nanoscience
Our group’s expertise in nanomaterials synthesis and electrochemistry forms the foundation of my research program. With fundamental study on nanotubes, nanowires and nanocrystals, we are interested in growth mechanism and application of these nanostructures at energy storage, catalysis, and biomedical fields. Research projects are; (1) synthesis and characterization of heterogeneous nanostructures with various electronic and/or electrochemical materials and their application to high-power energy storage devices and ultrafast electrochromic display, (2) synthesis and characterization of bio-nanostructures for biomedical applications such as targeted drug delivery, protein separation and biosensors, and (3) investigation of fundamental physical and chemical properties of heterogeneous nanostructured materials such as diffusions, reactions, cell interactions. In addition, we have recently expanded our research to the synthesis of heterogeneous nanocrystals for their use of high catalytic activity.
Synthesis and application of thin film nanostructures and electrochemical study
We have been investigating new electrochemical growth mechanisms of the nanostructures of various materials such as polymers, metal oxides, and metals. The thin nature of nanostructures enable us to design extremely fast charge transport devices. Using the same principle, we are developing high-power high-energy storage devices such as supercapacitors and high power batteries that will also enable fast charge for high energy electric devices both in liquid and solid state systems. In addition, we have extended to other various combination of metal oxides/metals/conductive polymers heterogeneous nanostructures through the mechanistic study of electrochemical deposition/conversion/transformation and atomic layer deposition methods through the collaboration with Prof. Gary Rubloff group at the Dept. of Mater. Sci. Eng. Currently we are expanding our studies to two major areas. One is the fundamental understanding of ion transport problems at nanoscale space where electrical double layer dimension is close to or even overlaps. Beyond the individual nanostructures and arrays, the close proximity and spacing between nanostructures may raise questions and access phenomena unexpected from the behavior of individual heterogeneous nanostructures both in liquid and solid electrolyte systems. The other area is electrochemical mechanism study on the deposition, conversion, and transformation of hierarchical nanostructures. Hierarchical nanostructures have previously been shown to enhance adsorption, insertion, and conversion reactions that are associated with catalysis, energy storage, energy conversion, chromatography, and chemical sensing. This multi-scale texturization allows for a synergistic joining of two different length scales resulting in performances better than their single architectured counterparts, which can be an ideal solution where the above ‘ionics’ problem is dominent. Our goal is to develop a general method and mechanism for creating these hierarchical structures that can be applied to various nanostructured materials systems.
Diffusion and reaction problems in a confined geometry of nanostructures
To investigate basic questions surrounding nanofluidics (wetting and dewetting), catalytic reactions and molecular diffusion in a confined nanoscale geometry. We are investigating; (1) Wetting and diffusion problem in well defined pores, (2) Catalytic reactions in a catalyst-anchored nanostructures including nanocrystals and molecular clusters such as polyoxometalates (POMs), (3) Control of atomic layer deposition in nanoscale.
Synthesis and characterization of bio-nanostructures for biomedical applications
We study fundamental phenomena and mechanism of the interactions between cell surfaces and nanoparticles with different materials and particle shapes in the fields of drug delivery, biosensors, and nanotoxicology.
1. “Electrochemical Thin Layers in Nanostructures for Energy Storage,” Acc. Chem. Res., 2016, 49, 2336–2346. DOI: 10.1021/acs.accounts.6b00315
2. “Interconnected mesoporous V2O5 electrode: impact on lithium ion insertion rate,” Phys. Chem. Chem. Phys., 2016,18, 30605-30611 DOI: 10.1039/C6CP05640G
3. “Dual-template ordered mesoporous carbon/Fe2O3 nanowires as lithium-ion battery anodes,” Nanoscale 2016, 8, 12958-12969 DOI: 10.1039/c6nr02576e
4. “Mapping the Challenges of Magnesium Battery,” J. Phys. Chem. Lett., 2016, 7, 1736-1749 DOI: 10.1021/acs.jpclett.6b00384
5. “One-pot synthesis of Pd@ Pt core–shell nanocrystals for electrocatalysis: control of crystal morphology with polyoxometalate,” CrystEngComm, 2016, 18, 6029-6034 DOI: 10.1039/C6CE00816J
6. “Quantification of antibody coupled to magnetic particles by targeted mass spectrometry,” Anal Bioanal Chem. 2016, 408, 8325-8332. DOI: 10.1007/s00216-016-9948-3