- Surface science, nanoscience and catalysis
- Hot electron chemistry and catalytronics
- Nanotribology and scanning probe microscopy

1999.06-2002.03 Postdoctoral Associate, University of Maryland, College Park, US
2002.04-2006.9 Lawrence Berkeley National Laboratory, USA, Physicist Postdoctoral Fellow
2006.10-2009.08 Lawrence Berkeley National Laboratory, USA, Staff Scientist
2009.08-2017.02 KAIST, Graduate School of EEWS, Associate Professor
2013.09-2016.08 IBS, Center for Nanomaterials and Chemical Reaction, Group Leader
2017.03-present KAIST, Department of Chemistry, Professor
2016.09-present IBS, Center for Nanomaterials and Chemical Reaction, Associate Director

2016 Top 10 Research Achievements, KAIST
2012 Top Government R&D Achievement Award (National Science & Technology Commission)
2012 Top 50 Basic Research Achievement Award (National Research Foundation)