A4.   S. Koo and S. Ryu,*

       "Photostable Two-Dimensional Organic Crystals",

        Under preparation

A3.   M. I. Song and S. Ryu,*

       "Varying Anisotropy in Thermal Oxidations of Transition Metal Dichalcogenides",

        Under preparation

A2.   W. Kim and S. Ryu,*

       "Anomalous Optical Second Harmonic Generation in MoS2/WS2 Bilayers",

        Under preparation

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

       "Polarized Raman Spectra of Layered CrPS4",

        To be submitted

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

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

        Under review (2019)

59.   K. Park, H. Kang, S. Koo, D. Lee and S. Ryu,*

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

        Nature Commun. in press (2019)

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]19 times cited

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]26 times cited

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]125 times cited

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]36 times cited

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]65 times cited

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]47 times cited

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]177 times cited

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]302 times cited  

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]117 times cited

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]250 times cited

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]54 times cited  

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]133 times cited

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]; 270 times cited

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]276 times cited

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]; 66 times cited

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]; 268 times cited

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]