As the silicon based devices approach their fundamental size limits, the world is turning to nanoscale science to continue the modern electronics evolution. One of the most impressive results of this effort is the development of devices based on nanoscale materials, which often exhibit excellent characteristics that are comparable, and in some cases even superior, to the properties of traditional semiconductors.

Our group's main research interest is to explore fundamental physics and chemistry in the nanometer scale by investigating electrical, optical and thermal properties of individual nanostructures, including single molecules, nanocrystals, nanowires, carbon nanotubes, and their arrays. In particular, we are most interested in studying how fundamental physical quanta ? electrons, photons and phonons are coupled to each other in the nanometer scale and how we can apply this knowledge for future technological advances.

This research field is multidisciplinary in nature; exploring physical properties of individual structures involves addressing key scientific issues regarding: 1) smarter materials synthesis and device design, 2) advanced nanoscale characterization of electrical and optical properties, and 3) rational strategy for integration with the external measurements setup. The mastery of these issues is essential not only to create novel electronic and optical devices, but it also has the potential to impact other major disciplines including materials science, physical sciences, electrical engineering and bioengineering.

• M. W. Graham, S. Shi, D. C. Ralph, J. Park and P. L. McEuen, "Photocurrent Measurements of Supercollision Cooling in Graphene," Nature Physics 9, 103-108 (2013).

• M. P. Levendorf, C.-J. Kim, L. Brown, P. Y. Huang, R. W. Havener, D. A. Muller, and J. Park, "Graphene and Boron Nitride Lateral Heterostructures for Atomically Thin Circuitry," Nature 488, 627-632 (2012).

• A. W. Tsen, L. Brown, M. P. Levendorf, F. Ghahari, P. Y. Huang, C. S. Ruiz-Vargas, R. W. Havener, D. A. Muller, P. Kim, and J. Park, "Tailoring Electrical Transport across Grain Boundaries in Polycrystalline Graphene," Science 336, 1143-1146 (2012).

• R. W. Havener, H. Zhuang, L. Brown, R. Hennig, and J. Park, “Angle-Resolved Raman Imaging of Interlayer Rotations and Interactions in Twisted Bilayer Graphene” Nano Letters 12, 3262-3167 (2012).

• L. Brown, R. Hovden, P. Huang, M. Wojick, D. A. Muller, and J. Park, "Twinning and Twisting of Tri- and Bi-layer Graphene", Nano Letters 12, 1609-1615 (2012).

• J. W. Colson, A. R. Woll, A. Mukherjee, M. P. Levendorf, E. L. Spitler, V. B. Shields, M. G. Spencer, J. Park, and W. R. Dichtel, "Oriented 2D Covalent Organic Framework Thin Films on Single Layer Graphene," Science 332, 228-231 (2011).

• P. Y. Huang, C. S. Ruiz-Vargas, A. M. van der Zande, W. S. Whitney,  M. P. Levendorf, J. W. Kevek, S. Garg, J. S. Alden, C. J. Hustedt, Y. Zhu, J. Park, P. L. McEuen, D. A. Muller, “Grains and Grain Boundaries in Single-Layer Graphene Atomic Patchwork Quilts,” Nature 469, 389-392 (2011).

• D. Y. Joh, J. Kinder, L. H. Herman, S.-Y. Ju, M. A. Segal, J. N. Johnson, G. K. L. Chan, J. Park, “Single walled carbon nanotubes as excitonic optical wires”, Nature Nanotechnology 6, 51-56 (2011).

• D. Y. Joh, L. H. Herman, S.-Y. Ju, J. Kinder, M. A. Segal, J. N. Johnson, G. K. L. Chan, J. Park, “On-chip Rayleigh imaging and spectroscopy of carbon nanotubes”, Nano Letters 11, 1-7. (2011, cover article)

• M.P. Levendorf, C. Ruiz-Vargas, S. Garg, and J. Park, “Transfer-Free Batch Fabrication of Single Layer Graphene Transistors”, Nano Letters 9, 4479-4483 (2009).

• N. M. Gabor, Z. Zhong, K. Bosnick, J. Park, and P. L. McEuen. “Extremely efficient multiple electron-hole pair generation in carbon nanotube photodiodes”, Science 325, 1367-1371 (2009).

• J. Park, Y.H. Ahn, C. Ruiz-Vargas. “Imaging of Photocurrent Generation and Collection in Single Layer Graphene”, Nano Letters 9, 1742-1746 (2009).

• W. Tsen, L.A.K. Donev, H. Kurt, L.H. Herman, J. Park “Imaging electrical conductance of individual carbon nanotubes with photothermal current microscopy”, Nature Nanotechnology 4, 108-113 (2009).

• 2010 Sloan Research Fellowship
• 2009 Presidential Early Career Award for Scientists and Engineers 
• 2008 NSF CAREER Award
• 2003-2006 Rowland Junior Fellow, Harvard University