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Scanning Probe Microscopy

Surface science techniques allow us to determine reaction intermediates and surface mobility under catalytic reaction conditions. Atomic force microscopy (combined with friction and conductance measurements) was utilized at ambient and reaction conditions, which permits us to investigate the nanomechanical (e.g., friction, adhesion, wear, indentation, modulus), charge transport (e.g., conductance, bandgap), and structural properties.

Our group demonstrated that friction mapping on exfoliated graphene exhibits ripple structures. [Jin Sik Choi, Jin-Soo Kim, Ik-Su Byun, Duk Hyun Lee, Mi Jung Lee, Bae Ho Park*, Changgu Lee, Duhee Yoon, Hyeonsik Cheong, Ki Ho Lee, Young-Woo Son, Jeong Young Park*, and Miquel Salmeron. Friction Anisotropy–Driven Domain Imaging on Exfoliated Monolayer Graphene. Science. 333, 607 (2011).] A remarkable enhancement of friction on the chemically modified graphene was first observed by our group. [Sangku Kwon, Jae-Hyeon Ko, Ki-Joon Jeon, Yong-Hyun Kim*, and Jeong Young Park*. Enhance Nanoscale Friction on Fluorinated Graphene. Nano Letters. 12, 6043-6048 (2012), Highlighted in Nature 487, 143 (2012).] Prof. M. Salmeron and I also reviewed the fundamental aspects of energy dissipation in friction. [Jeong Young Park* and Miquel Salmeron*. Chemical Reviews. 114, 677-711 (2014).]

Figure. Measuring enhanced friction on chemically modified graphene (left), and the friction and conductance measurements on VO2 across metal-insulator transition (right).