Publications

A5.   K. Park and S. Ryu,*

        "Two competing routes for charge transfer doping of graphene in acidic solutions",

        Under preparation

A4.   H. Kang and S. Ryu,*

        "Role of Janus Water in Charge Transfer of Supported Monolayer Semiconducting Transition Metal Dichalcogenides",

        Under preparation

A3.   S. Koo and S. Ryu,*

       "Structure and Optical Anisotropy of Two-Dimensional Tetracene Crystal",

        Under preparation

A2.   M. I. Song and S. Ryu,*

       "Oxidation of Varying Anisotropy in Two-Dimensional Transition Metal Dichalcogenides",

        Under preparation

A1.   S. Kim, J. Lee, C. Lee and S. Ryu,*

       "Polarized Raman Spectra and Complex Raman Tensors of Antiferromagnetic Semiconductor CrPS4",

        To be submitted





62.   W. Kim, J. Y. Ahn, J. Oh, J. H. Shim and S. Ryu,*

       "Second-Harmonic Young's Interference in Atom-Thin Heterocrystals",

        arXiv:2008.02403, submitted (2020)


61.   S. W. Jang, S. Dutta, A. Kumar, Y.-R. Hong, H. Kang, S. Lee, S. Ryu, W. Choi, and I. S. Lee,

       "Holey Pt Nanosheets on NiFe-Hydroxide Laminates: Synergistically Enhanced Electrocatalytic 2D Interface toward Hydrogen Evolution Reaction",

        ACS Nano 14, 10578 (2020);  [Link] [PDF]


60.   J. Choi, S. Koo, M. Song, D. Jung, S. Choi  and S. Ryu,*

       "Varying Electronic Coupling at Graphene-Copper Interfaces Probed with Raman Spectroscopy",

        2D Materials 7, 025006 (2020) [Link] [PDF]


59.   K. Park#, H. Kang#, S. Koo, D. Lee and S. Ryu,* (#equal contribution)

       "Redox-Governed Charge Doping Dictated by Interfacial Diffusion in Two-Dimensional Materials",

        Nature Commun. 10, 4931 (2019);  [Link] [PDF]


58.   S. Kim, J. Lee, G. Jin, M.-H. Jo, C. Lee and S. Ryu,*

       "Crossover between Photochemical and Photothermal Oxidations of Atomically Thin Magnetic Semiconductor CrPS4",

        Nano Lett. 19, 4043 (2019);  [Link] [PDF]

 

57.   H. Jeon, T. Teraji, K. Watanabe, T. Taniguchi and S. Ryu,*

       "Lattice Vibrations of Single and Multi-Layer Isotopologic Graphene",

        Carbon 140, 449 (2018);  [Link] [PDF]


56.   Y. Kwon, K. Kim, W. Kim, S. Ryu and H. Cheong,

       "Variation of Photoluminescence Spectral Line Shape of Monolayer WS2",

        Curr. Appl. Phys. 18, 941 (2018);  [Link] [PDF]


55.   G. Ahn and S. Ryu,*

       "Reversible Sulfuric Acid Doping of Graphene Probed by in-situ Multi-Wavelength Raman Spectroscopy",

        Carbon 138, 257 (2018);  [Link] [PDF]

 

54.   S.-J. Kwon, T.-H. Han, T. Y. Ko, N. Li, S.-H. Bae, K. S. Kim, S. Ryu and T.-W. Lee,

       "Extremely Stable Graphene Electrodes Doped with Macromolecular Acid",

        Nature Commun. 9, 2037 (2018);  [Link] [PDF]


53.   Y. Jang, S.-J. Kwon, J. Shin, H. Jeong, W.-T. Hwang, J.-W. Kim, J. Koo, T. Y. Ko, S. Ryu, G. Wang, T.-W. Lee, and T. Lee,

       "Interface-Engineered Charge Transport Properties in Benzenedithol Molecular Electronic Junctions via Chemically p-doped Graphene Electrodes",

        ACS Appl. Mater. & Interfaces 9, 42043 (2017);  [Link] [PDF]


52.   Y. Ryu, W. Kim, S. Koo, H. Kang, K. Watanabe, T. Taniguchi, and S. Ryu,*

       "Interface-Confined Doubly Anisotropic Oxidation of Two-Dimensional MoS2",

        Nano Lett. 17, 7267 (2017);  [Link] [PDF]


51.   J. Lee, T. Y. Ko, J. H. Kim, H. Bark, B. Kang, S.-G. Jung, T. Park, Z. Lee, S. Ryu,* and C. Lee,*

       "Structural and Optical Properties of Single- and Few-Layer Magnetic Semiconductor CrPS4",

        ACS Nano 11, 10935 (2017);  [Link] [PDF]


50.   D.-G. Lee, H. Jeong, K.-W. Jeon, L. Zhang, K. Park, S. Ryu, J. Kim, and I. S. Lee,

       "Carbon thin-layer-coated manganese oxide nanocrystals as an effective support for high-performance Pt electrocatalysts stabilized at a metal–metal oxide–carbon triple junction",

        J. Mater. Chem. A 5, 22341 (2017);  [Link] [PDF]


49.   D. Luo, X. You, B.-W. Li, X. Chen, H. J. Park, M. Jang, T. Y. Ko, K. Wong, M. Yousaf, X. Chen, M. Huang, S. H. Lee,  Z. Lee, H.-J. Shin, S. Ryu, S. K. Kwak, N. Park, R. R. Bacsa, W. Bacsa, R. S. Ruoff,

       "Role of Graphene in Water-Assisted Oxidation of Copper in Relation to Dry Transfer of Graphene",

        Chem. Mater. 29, 4546 (2017);  [Link] [PDF]


48.   P. K. Nayak, Y. Horbatenko, S. Ahn, G. Kim, J.-U. Lee, K. Y. Ma, A-R. Jang, H. Lim, D. Kim, S. Ryu, H. Cheong, N. Park, and H. S. Shin,

       "Probing Evolution of Twist-Angle-Dependent Interlayer Excitons in MoSe2/WSe2 van der Waals Heterostructures",

        ACS Nano 11, 4041 (2017);  [Link] [PDF]


47.   J. E. Lee, J. Jung, T. Y. Ko, S. Kim, S.-I. Kim, J. Nah, S. Ryu, K. T. Nam and M. H. Lee,

       "Catalytic synergy effect of MoS2/reduced graphene oxide hybrids for a highly efficient hydrogen evolution reaction",

        RSC Adv. 7, 5480 (2017);  [Link] [PDF] 


46.   T. Y. Ko, A. Jeong, W. Kim, J. Lee, Y. Kim, J. E. Lee, G. H. Ryu, K. Park, D. Kim, Z. Lee, M. H. Lee, C. Lee and S. Ryu,*

       "On-Stack Two-Dimensional Conversion of MoS2 into MoO3",

        2D Materials 4, 014003 (2017);  [Link] [PDF]


45.   X. Zhang, Y. Huang, S. Chen, N. Y. Kim, W. Kim, D. Schilter, M. Biswal, B. Li, Z. Lee, S. Ryu, C. W. Bielawski, W. S. Bacsa, and R. S. Ruoff,

       "Birch-Type Hydrogenation of Few-Layer Graphenes: Products and Mechanistic Implications",

        J. Am. Chem. Soc. 138, 14980 (2016);  [Link] [PDF]


44.   H. Kwon, S. W. Seo, T. G. Kim, E. S. Lee, P. T. Lanh, S. Yang, S. Ryu,* J. W. Kim,*

       "Ultrathin and Flat Layer Black Phosphorus Fabricated by Reactive Oxygen and Water Rinse",

        ACS Nano 10, 8723 (2016);  [Link] [PDF]


43.   S. Kim and S. Ryu,*

       "Thickness-Dependent Native Strain in Graphene Membranes Visualized by Raman Spectroscopy ",

        Carbon 100, 283 (2016);  [Link] [PDF]


42.   S.-S. Kim, M. J. Park, J.-H. Kim, G. Ahn, S. Ryu, B. H. Hong, and B.-H. Sohn,

       "Strain-Assisted Wafer-Scale Nanoperforation of Single-Layer Graphene by Arrayed Pt Nanoparticles",

        Chem. Mater. 27, 7003 (2015);  [Link] [PDF]


41.   D.-S. Kim, H. Kwon, A. Y. Nikitin, S. Ahn, L. Martín-Moreno, F. J. García-Vidal, S. Ryu, H. Min, and Z. H. Kim,

       "Stacking Structures of Few-Layer Graphene Revealed by Phase-Sensitive Infrared Nanoscopy",

        ACS Nano 9, 6765 (2015);  [Link] [PDF]


40.    K. Park and S. Ryu,*

        "Direction-Controlled Chemical Doping for Reversible G-Phonon Mixing in ABC Trilayer",

        Sci. Rep. 5, 8707 (2015);  [Link] [PDF]


39.    Y.-J. Yu, K. S. Kim, J. Nam, S. R. Kwon, H. Byun, K. Lee, J.-H. Ryou, R. D. Dupuis, J. Kim, G. Ahn, S. Ryu, M.-Y. Ryu and J. S. Kim,

        "Temperature-Dependent Resonance Energy Transfer from Semiconductor Quantum Wells to Graphene",

        Nano Lett. 15, 896 (2015);  [Link] [PDF]


38.    P. Joo, K. Jo, G. Ahn, D. Voiry, H. Y. Jeong, S. Ryu, M. Chhowalla, and B.-S. Kim,*

        "Functional Polyelectrolyte Nanospaced MoS2 Multilayers for Enhanced Photoluminescence",

        Nano Lett. 14, 6456 (2014);  [Link] [PDF]


37.    Y. Ryu, M. K. Park, and S. Ryu,*

        "Thermal Modulation of Photoluminescence from Single-Layer MoS2",

        Bull. Korean Chem. Soc. 35, 3077 (2014);  [Link] [PDF]


36.    G. Park, S. K. Park, J. Han, T. Y. Ko, S. Lee, J. Oh, S. Ryu, H. S. Park and S. Park,

        "Finely Tuning Oxygen Functional Groups of Graphene Materials and Optimizing Oxygen Levels for Capacitors ",

        RSC Adv. 4, 36377 (2014);  [Link] [PDF]


35.    D. Lee, G. Ahn and S. Ryu,*

        "Two-Dimensional Water Diffusion at a Graphene-Silica Interface",

        J. Am. Chem. Soc. 136, 6634 (2014);  [Link] [PDF]


34.    Y. Kim, D. Cho, S. Ryu and C. Lee,

        "Tuning Doping and Strain in Graphene by Microwave-Induced Annealing",

        Carbon 67, 673 (2014);  [Link] [PDF]


33.    J. Hong, M. K. Park, E. J. Lee, D. Lee, D. S. Hwang and S. Ryu,*

        "Origin of New Broad Raman D and G Peaks in Annealed Graphene",

        Sci. Rep. 3, 2700 (2013);  [Link] [PDF]


32.    S. W. Han, Y. H. Hwang, S.-H. Kim, W. S. Yun, J. D. Lee, M. G. Park, S. Ryu, J. S. Park, D.-H. Yoo, S.-P. Yoon, S. C. Hong, K. S. Kim, and Y. S. Park,

        "Controlling Ferromagnetic Easy Axis in a Layered MoS2 Single Crystal",

        Phys. Rev. Lett. 110, 247201 (2013);  [Link] [PDF]


31.    G. Ahn , H. R. Kim , T. Y. Ko , K. Choi , K. Watanabe , T. Taniguchi , B. H. Hong , and S. Ryu,*

        "Optical Probing of the Electronic Interaction between Graphene and Hexagonal Boron Nitride",

        ACS Nano 7, 1533 (2013);  [Link] [PDF]


30.    S.-W. Min, H. S. Lee, H. J. Choi, M. K. Park, T. Nam, H. Kim, S. Ryu and S. Im,

        "Nanosheet Thickness-Modulated MoS2 Dielectric Property Evidenced by Field-Effect Transistor Performance",

        Nanoscale 5, 548 (2013);  [Link] [PDF]


29.    M. J. Lee, J. S. Choi, J.-S. Kim, I.-S. Byun, D. H. Lee, S. Ryu, C. Lee, and B. H. Park,

        "Characteristics and Effects of Diffused Water Between Graphene and a SiO2 Substrate",

        Nano Res. 5, 710 (2012);  [Link] [PDF]


28.    H. S. Lee, S.-W. Min, M. K. Park, Y. T. Lee, P. J. Jeon, J. H. Kim, S. Ryu and S. Im,

        " MoS2 Nanosheets for Top-Gate Nonvolatile Memory Transistor Channel",

        Small 8, 3111 (2012);  [Link] [PDF]


27.    S. W. Han, G.-B. Cha, E. Frantzeskakis, I. Razado-Colambo, J. Avila, Y. S. Park, D. Kim, J. Hwang, J. S. Kang, S. Ryu, W. S. Yun, S. C. Hong, and M. C. Asensio,

        "Band-Gap Expansion in the Surface-Localized Electronic Structure of MoS2(0002)",

        Phys. Rev. B 86, 115105 (2012);  [Link] [PDF]


26.    J. E. Lee, G. Ahn, J. Shim, Y. S. Lee, and S. Ryu,*

        "Optical Separation of Mechanical Strain from Charge Doping in Graphene",

        Nature Commun. 3, 1024 (2012);  [Link] [PDF]


25.    H. S. Lee, S. Min, Y. Chang, M. K. Park, T. Nam, H. Kim, J. H. Kim, S. Ryu, and S. Im,

        “MoS2 Nanosheet Phototransistors with Thickness-Modulated Optical Energy Gap”,

        Nano Lett. 12, 3695 (2012);  [Link] [PDF]


24.    G. Ahn, H. R. Kim, B. H. Hong, and S. Ryu,* 

        “Raman Spectroscopy Study on the Reactions of UV-Generated Oxygen Atoms with Single-Layer Graphene on SiO­2/Si Substrates”,

        Carbon Lett. 13, 34 (2012);  [Link] [PDF]


23.    J. Shim, C. H. Lui, T. Y. Ko, Y.-J. Yu, P. Kim, T. F. Heinz, and S. Ryu,*

        “Water-Gated Charge Doping of Graphene Induced by Mica Substrates”, 

         Nano Lett. 12, 648 (2012)[Link] [PDF]


22.    H. Kwon, K. Hwang, J. Park, S. Ryu, and S. K. Kim,  

        “Electron Solvation and Solvation-Induced Crystallization of an Ammonia Film on Ag(111) Studied by 2-Photon Photoemission”, 

        Phys. Chem. Chem. Phys. 13, 17785 (2011);  [Link] [PDF]


21.    S. W. Han, H. Kwon, S. K. Kim, S. Ryu, W. S. Yun, D. H. Kim, J. H. Hwang, J.-S. Kang, J. Baik, H. J. Shin, and S. C. Hong,  

        “Band-Gap Transition Induced by Interlayer van der Waals Interaction in MoS2”, 

        Phys. Rev. B 84, 045409 (2011);  [Link] [PDF]


20.    S. Ryu,* J. Maultzsch, M. Y. Han, P. Kim, and L. E. Brus, 

        “Raman Spectroscopy of Lithographically Patterned Graphene Nanoribbons”, 

        ACS Nano 5, 4123 (2011);  [Link] [PDF]


19.    S. Ryu, Li Liu, S. Berciaud, Y.-J. Yu, H. Liu, P. Kim, G. W. Flynn, and L. E. Brus, 

        “Atmospheric Oxygen Binding and Hole Doping in Deformed Graphene on a SiO2 Substrate”, 

        Nano Lett. 10, 4944 (2010);  [Link] [PDF]


18.    J. Song, T. Y. Ko, and S. Ryu,* 

        “Raman Spectroscopy Study of Annealing-Induced Effects on Graphene Prepared by Micromechanical Exfoliation”, 

        Bull. Korean Chem. Soc. 31, 2679 (2010);  [Link] [PDF]


17.    C. Lee, H. Yan, L. E. Brus, T. F. Heinz, J. Hone, and S. Ryu,* 

        “Anomalous Lattice Vibrations of Single- and Few-Layer MoS2”, 

        ACS Nano 4, 2695 (2010);  [Link] [PDF]


16.    S. Vukelic, P. Kongsuwan, S. Ryu and Y. L. Yao,

        "Ultrafast Laser Induced Structural Modification of Fused Silica—Part II: Spatially Resolved and Decomposed Raman Spectral Analysis",

        J. Manuf. Sci. E. 132, 061013 (2010);  [Link] [PDF]


15.    H. Liu, S. Ryu, Z. Chen, M. L. Steigerwald, C. Nuckolls, and L. E. Brus, 

        “Photochemical Reactivity of Graphene”, 

        J. Am. Chem. Soc. 131, 17099 (2009);  [Link] [PDF]


14.    Y.-J. Yu, Y. Zhao, S. Ryu, L. E. Brus, K. S. Kim, and P. Kim, 

        “Tuning the Graphene Work Function by Electric Field Effect”, 

        Nano Lett. 9, 3430 (2009);  [Link] [PDF]


13.    E. Stolyarova, D. Stolyarov, K. Bolotin, S. Ryu, L. Liu, K. T. Rim, M. Klima, M.Hybertsen, 

        I. Pogorelsky, I. Pavlishin, K. Kusche, J. Hone, P. Kim, H. L. Stormer, V. Yakimenko, and G. Flynn, 

        “Observation of Graphene Bubbles and Effective Mass Transport under Graphene Films”, 

        Nano Lett. 9, 332 (2009);  [Link] [PDF]


12.    S. Berciaud, S. Ryu, L. E. Brus, and T. F. Heinz, 

        “Probing the Intrinsic Properties of Exfoliated Graphene: Raman Spectroscopy of Free-Standing Monolayers”, 

        Nano Lett. 9, 346 (2009);   [Link] [PDF]


11.    S. Ryu, M. Y. Han, J. Maultzsch, M. L. Steigerwald, T. F. Heinz, P. Kim, and L. E. Brus, 

        “Reversible Basal Plane Hydrogenation of Graphene”, 

        Nano Lett. 8, 4597 (2008);  [Link] [PDF]


10.    L. Liu,+ S. Ryu,+ M. R. Tomasik, E. Stolyarova, N. J. Jung, M. S. Hybertsen, M. L. Steigerwald, L. E. Brus, and G. W. Flynn,

        “Graphene Oxidation: Thickness Dependent Etching and Strong Chemical Doping”, 

        Nano Lett. 8, 1965 (2008) (+equal authorship);  [Link] [PDF]


9.     J. S. Lee, S. Ryu, K. Yoo, J. Kim , I. S. Choi, and W. S. Yun, 

        “Local Inhomogeneity in Gate Hysteresis of Carbon Nanotube Field-effect Transistors Investigated by Scanning Gate Microscopy”,

        Ultramicroscopy 108, 1045 (2008);  [Link] [PDF] 


8.     J. S. Lee, S. Ryu, K. Yoo, I. S. Choi, W. S. Yun, and J. Kim, 

        “Origin of Gate Hysteresis in Carbon Nanotube Field-Effect Transistors”, 

        J. Phys. Chem. C 111, 12504 (2007);  [Link] [PDF]


7.     E. Stolyarova, K. T. Rim, S. Ryu, J. Maultzsch, P. Kim, L. E. Brus, T. F. Heinz, M. S. Hybertsen, and G. W. Flynn,

       “High-resolution Scanning Tunneling Microscopy Imaging of Mesoscopic Graphene Sheets on an Insulating Surface”,

        Proc. Natl. Acad. Sci. USA 104, 9209 (2007);  [Link] [PDF]


6.     S. Ryu, J. Chang, and S. K. Kim, 

        “Hot Electrons at Metal-organic interface: Time-resolved Two Photon Photoemission Study of Phenol on Ag(111)”, 

        J. Vac. Sci. Technol. A 24, 1454 (2006);  [Link] [PDF]


5.     S. Ryu, J. Chang, H. Kwon, and S. K. Kim, 

       “Dynamics of Solvated Electron Transfer in Thin Ice Film Leading to a Large Enhancement in Photodissociation of CFCl3”, 

        J. Am. Chem. Soc. 128, 3500 (2006);  [Link] [PDF]


4.     S. Ryu, J. Chang, and S. K. Kim, 

        “Interfacial Electron Dynamics and Hot-electron-driven Surface Photochemistry of Carbon Tetrachloride on Ag(111)”, 

        J. Chem. Phys. 123, 114710 (2005);  [Link] [PDF]


3.     J. Lee,+ S. Ryu,+ J. Chang, S. Kim, and S. K. Kim, 

        “Direct Observation of an Intermediate State for a Surface Photochemical Reaction Initiated by Hot Electron Transfer”, 

        J. Phys. Chem. B 109, 14481 (2005) (+equal authorship);  [Link] [PDF]


2.     J. Lee, S. Ryu, J. S. Ku, and S. K. Kim, 

        “Charge Transfer Photodissociation of Phenol on Ag(111)”, 

        J. Chem. Phys. 115, 10518 (2001);  [Link] [PDF]


1.     J. Lee, S. Ryu, and S. K. Kim, 

        “The Adsorption and Photochemistry of Phenol on Ag(111)”, 

        Surf. Sci. 481, 163 (2001);  [Link] [PDF]