I am mainly interested in fundamental aspects of energy dissipation and conversion at surfaces and interfaces. Once the external energy is deposited to the surface during the mechanical interaction, chemical processes, or absorption of photons, energy dissipation at surfaces and interfaces is mediated by excitation of elementary processes including surface phonons and electronic excitations. Understanding atomic mechanism of energy dissipation has great importance in the community of surface science, and may give intriguing possibility of controlling surface phenomena such as friction, chemical processes, or photon energy conversion.
My research topics include; 1) Detection and utilization of hot electron flows generated under exothermic catalytic reactions. It was found that the chemicurrent is correlated with the catalytic turnover rate of CO oxidation. 2) Hot electron detection on Pt colloid nanoparticle surfaces with metal-oxide Schottky diodes. 3) Investigation of influence of size, shape, and composition in Pt and Rh nanoparticles and bimetallic nanoparticles on the catalytic activity. 4) fundamental aspects of energy dissipation in friction – elucidation of electronic contribution in friction and atomic scale friction and adhesion properties of complex metallic alloys including decagonal quasicrystals. 5) Charge transport properties and mechanical properties in organic molecules.
1. Gabor A. Somorjai, and Jeong Y. Park, “Molecular Factors of Catalytic Selectivity” Angewandte Chemie Int. Ed. (Reviews) 47, 9212 – 9228 (2008). Selected as the Cover.
2. Sang Hoon Joo, Jeong Young Park, Chia-Kuang Tsung, Yusuke Yamada, Peidong Yang and Gabor A. Somorjai “Thermally Stable Nanocatalysts for High Temperature Reactions: Pt-Mesoporous Silica Core-Shell Nanoparticles” Nature Materials (in press, 2008). DOI: 10.1038/NMAT2329
3. Jeong Young Park, and P. A. Thiel, “Atomic scale friction and adhesion properties of quasicrystal surfaces” Journal of Physics: Condensed Matter 20, 314012 (2008).
4. Jeong Y. Park, Hyunjoo Lee, J. Russell Renzas, Yawen Zhang, and Gabor A. Somorjai "Probing Hot Electron Flow Generated on Pt Nanoparticles with Au/TiO2 Schottky Diodes during Catalytic CO Oxidation" Nano Letters 8, 2388-2392 (2008).
5. Jeong Young Park, Yawen Zhang, Michael Grass, Tianfu Zhang, and Gabor A. Somorjai “Tuning of Catalytic CO oxidation by Changing Composition of Rh-Pt Bimetallic Nanoparticles” Nano Letters, 8, 673 -677, (2008).
6. Gabor A. Somorjai and Jeong Y. Park, “Frontiers of Surface Science” Physics Today (feature article) 60, 48 (2007)
7. Jeong Young Park, D. F. Ogletree, P. A. Thiel, and M. Salmeron, “Electronic control of friction in silicon pn junctions “ Science, 313, 186, (2006).
8. Gabor A. Somorjai, Roger L. York, Derek Butcher and Jeong Y. Park, “The Evolution of Model Catalytic Systems; Studies of Structure, Bonding and Dynamics from Single Crystal Metal Surfaces to Nanoparticles, and from Low Pressure (< 10-3 Torr) to High Pressure (> 10-3 Torr) to Liquid Interfaces” Phys. Chem. Chem. Phys., (invited review paper), 9, 3500-3513 (2007).
9. Jinyu Chen, Imma Ratera, J. Y. Park, and Miquel Salmeron, “Velocity dependence of friction and hydrogen bonding effects” Phys. Rev. Lett. 96, 236102 (2006).
10. Jeong Young Park, and Gabor A. Somorjai, “The Catalytic Nanodiode: Detecting Continuous Electron Flow at Oxide-Metal Interfaces Generated by Gas Phase Exothermic Chemical Reaction” ChemPhysChem (invited concept article) 7, 1409 (2006).
11. Jeong Young Park, D. F. Ogletree, M. Salmeron, R. A. Ribeiro, P. C. Canfield, C. J. Jenks, and P. A. Thiel, “High Frictional Anisotropy of Periodic and Aperiodic Directions on a Quasicrystal Surface “ Science 309, 1354 (2005).
12. Jeong Young Park, G. M. Sacha, M. Enachescu, D. F. Ogletree, R. A. Ribeiro, P. C. Canfield, C. J. Jenks, and P. A. Thiel, J. J. Sáenz, and M. Salmeron “Sensing dipole fields at atomic steps with combined scanning tunneling and force microscopy” Phys. Rev. Lett. 95, 136802 (2005).
13. Jeong Young Park, D. F. Ogletree, M. Salmeron, R. A. Ribeiro, P. C. Canfield, C. J. Jenks, and P. A. Thiel, “Atomic scale coexistence of periodic and quasiperiodic order in a 2-fold Al-Ni-Co decagonal quasicrystal surface” Phys. Rev. B 72 (Rapid Communication), 220201 (2005).