高井研究室

研究成果



  1. Spin and Charge interactions between?Nanographene host and Ferrocene, A. Suzuki, Y. Miyake, R. Shibata, K. Takai, Beilstein J. Org. Chem. 20, 1011-1019 (2024)
  2. Fluorescent diamond microcrystals with NV-centres for photonics and sensing applications: identification and photophysical signatures, V.Yu. Osipov, F.M. Shakhov, K.V. Bogdanov, K. Takai, A.V. Baranov, Optics and Spectroscopy 131, 1661-1671 (2024)
  3. Photoluminescence features of nickel-nitrogen complexes in Ib HPHT diamond matrix, I. Kaliya, V. Osipov, F. Shakhov, K. Takai, K. Bogdanov, A. Baranov, Carbon 219, 118839 (2024)
  4. Effects of chemical modification using Au or I ion beam irradiation on the carrier transport properties of graphene, Y. Zhao, Y. Ishiguro, K. Nakamura, H. Yoshimoto, T. Nishimura, and K. Takai, Carbon Rep. 3, 37-46 (2024)
  5. Photoluminescence features of nickel-nitrogen complexes in Ib HPHT diamond matrix, I. Kaliya, V. Osipov, F. Shakhov, K. Takai, K. Bogdanov, and A. Baranov, Carbon 219,118839 (2024)
  6. Isolated Spin-7/2 Species of Gadolinium (III) Chelate Complexes on the Surface of 5-nm Diamond Particles, V. Osipov, D. Boukhvalov, and K. Takai, Nanomaterials 13,1995 (2023)
  7. Effect of low-energy ion-beam irradiation on the structure and electron transport of monolayer MoS2, Y. Zhao, Y. Ishiguro, K. Takai, Nucl. Instrum. Methods Phys. Res. B 543,165095 (2023)
  8. Correlation between charge density wave phase transition and hydrogen adsorption in 1T-TaS2 thin film devices, Y. Ishiguro, R. Suzuki, Y. Zhao, N. Kodama, and K. Takai, Nanotechnology, 34,275701 (2023)
  9. Functionalization of graphene for precise control of the structure and electronic properties of carbon materials, K. Takai, Carbon Rep. 2,67-77 (2023)
  10. Titanium dioxide nanoparticles heavily doped with niobium: a light-induced electron paramagnetic resonance study, V. Osipov, D. Hao, K. Takai, T. Uchikoshi, H. Ogata, and T. Ishigaki, Mendeleev Commun. 33,349-352 (2023)
  11. M. Inagaki and K. Takai, Terminology for graphene to graphite and for graphene oxide to graphite oxide, Carbon Rep. 1,59-69 (2022)
  12. Tracking nitrogen-to-nickel ratio and prevalent paramagnetic species in synthetic diamonds by electron spin resonance at 90 K, V. Osipov, F. Shakhov, N. Romanov, K. Takai, Mendeleev Commun. 32,645-648 (2022)
  13. Changing the structural and electronic properties of graphene and related two-dimensional materials using ion beam irradiation with NaCl sacrificial layers, T. Hidaka, K. Nakamura, H. Yoshimoto, R. Suzuki, Y. Zhao, Y. Ishiguro, T. Nishimura, and K. Takai, Carbon Rep., 1,22-31 (2022)
  14. Magnetic resonance tracking of copper ion fixation on the surface of carboxylated nanodiamonds from viewpoint of changes in carbon-inherited paramagnetism, V. Osipov, N. Romanov, I. Suvorkova, E. Osipova, T. Tsuji, Y. Ishiguro, and K. Takai, Mendeleev Commun., 32, 132-135 (2022)
  15. Anomalous spin relaxation in graphene nanostructures on the high temperature annealed surface of hydrogenated diamond nanoparticles, V. L. J. Joly, K. Takai, M. Kiguchi, N. Komatsu, T. Enoki, Phys. Chem. Chem. Phys., 23,19209-19218 (2021)[Selected as Hot Article]
  16. Solid-state reaction of niobium with diamond carbon at high pressure and high temperature to form superconducting composite, V. Osipov, F. Shakhov, N. Romanov, K. Takai, Mendeleev Commun., 31 415-418 (2021)
  17. Irradiation of detonation nanodiamonds with γ-rays does not produce long living spin radicals, V. Osipov, N. Romanov, and K. Takai, Mendeleev Commun., 31 227-229 (2021)
  18. Long range interactions and related carbon-carbon bond reconstruction between interior and surface defects in nanodiamonds, D. Boukhvalov, V. Osipov, and K. Takai, Phys. Chem. Chem. Phys., 23 14592 (2021) [Selected as Hot Article]
  19. Layer Number Dependence of Charge Density Wave Phase Transition Between Nearly-Commensurate and Incommensurate Phases in 1T-TaS2, Y. Ishiguro, K. Bogdanov, N. Kodama, M. Ogiba, T. Ohno, A. Baranov, and K. Takai, J. Phys. Chem. C, 124 27176-27184 (2020)
  20. High-Quality Green-Emitting Nanodiamonds Fabricated by HPHT Sintering of Polycrystalline Shockwave Diamonds, V. Osipov, F. Shakhov, K. Bogdanov, K. Takai, T. Hayashi, F. Treussart, A. Baldycheva, B. Hogan, C. Jentgens, Nanoscale Res. Lett., 15 209 (2020)
  21. Gadolinium ion bonding on the surface of carboxylated detonation nanodiamond in terms of magnetochemistry and density functional theory, V. Osipov, D. Boukhvalov, K. Takai, Mendeleev Commun., 30 436-438 (2020)
  22. Structure and Magnetic Properties of Superoxide Radical Anion Complexes with Low Binding Energy at the Graphene Edges, V.Yu. Osipov, D.W. Boukhvalov, K. Takai, Russian Journal of Coordination Chemistry, 46 738-745 (2020)
  23. Intrinsic infrared absorption for carbon-fluorine bonding in fluorinated Nanodiamond, V. Osipov, N. Romanov, K. Kogane, H. Touhara, Y. Hattori, K. Takai, Mendeleev Commun., 30 1-4 (2020)
  24. Photoluminescence from NV- Centres in 5 nm Detonation Nanodiamonds: Identification and High Sensitivity to Magnetic Field, V. Osipov, F. Treussart, S. Zargaleh, K. Takai, F. Shakhov, B. Hogan and A. Baldycheva, Nanoscale Res. Lett., 14 279 (2019)
  25. Stability of Optical Responses from Lead-free Perovskite Films, E. Ushakova, A. Matuhina, A. Sokolova, S. Cherevkov, K. Bogdanov, A. Dubavik, M. Baranov, A. Litvin, K. Takai, A. Fedorov, A. Baranov, Optics and Spectroscopy, 127 1110-1116 (2019)
  26. Noncovalent bonding of copper atoms on the nitrogen containing sites of hydrogenated diamond surface, V. Osipov, D. Boukhvalov, K. Takai, Mendeleev Commun.29 452-454 (2019)
  27. Nitrogen impurities and fluorescent nitrogen-vacancy centers in detonation nanodiamonds: identification and distinct features, V. Yu. Osipov, S. Abbasi Zargaleh, F. Treussart, K. Takai, N. M. Romanov, F. M. Shakhov, and A. Baldycheva, J. Opt. Technology, 86 1-8 (2019)
  28. Highly intensive emission of the NV- centers in synthetic HPHT microdiamonds at low nitrogen doping, K. V. Bogdanov, M. V. Zhukovskaya, V. Yu. Osipov, E. V. Ushakova, M. A. Baranov, K. Takai, A. Rampersaud, and A. V. Baranov, APL Materials, 6 086104 (2018)
  29. Dry Microwave Heating Enables Scalable Fabrication of Pristine Holey Graphene Nanoplatelets and Their Catalysis in Reductive Hydrogen Atom Transfer Reactions, K. Savaram, M. Li, K. Tajima, K. Takai, T. Hayashi, G. Hall, E. Garfunkel, V. Osipov, and H. He, Carbon, 139 861-871 (2018)
  30. Study of the Optical Properties of CdZnSe/ZnS-Quantum Dot-Au-Nanoparticle Complexes, D. Volgina, E. Stepanidenko, T. K. Kormilina, S. A. Cherevkov, A. Dubavik, M. A. Baranov, A. P. Litvin, A. V. Fedorov, A. V. Baranov, K. Takai, P. S. Samokhvalov, I. R. Nabiev, and E.V. Ushakova, Optics and Spectroscopy, 124 494-500 (2018)
  31. Reduction of 2-nitrophenol using a hybrid C-Ni nanocomposite as a catalyst, J. Ko, J. Li, A. Suzuki, K. Takai, W. Ko, Micro and Nano Letters, 13 1310-1314 (2018)
  32. Identifying quasi-free and bound nitrate ions on the surfaces of diamond nanoparticles by IR and x-ray photoelectron spectroscopy, V. Yu. Osipov, N. M. Romanov, F. M. Shakhov, and K. Takai, J. Opt. tech., 85 122-129 (2018)
  33. Boron doped diamond synthesized from detonation nanodiamond in a C-O-H fluid at high pressure and high temperature, F. Shakhov, A. Abyzov, and K. Takai, J. Solid Stat. Chem., 256 72-92 (2017)
  34. Infrared spectroscopic study to determine thermal resistance of the functionalized surface of a detonation nanodiamond, N. M. Romanov, V. Yu. Osipov, K. Takai, H. Touhara, and Y. Hattori, J. Opt. Tech. 84 654-657 (2017)
  35. Formation mechanism of zeolite-templated carbons, H. Nishihara, K. Imai, K. Nomura, K. Takai, T. Kyotani, TANSO 280 169-174 (2017)
  36. Functional group dependence of spin magnetism in graphene oxide, K. Tajima, T. Isaka, T. Yamashina, Y. Ohta, Y. Matsuo and K. Takai, Polyhedron 136 155-158 (2017)
  37. Boron-doped diamond synthesized at high-pressure and high-temperature with metal catalyst, F. Shakhov, A. Abyzov, S. Kidalov, A. Krasilin, E. Lahderanta, V. Lebedev, D. Shamshur, K. Takai, J. Phys. Chem. Solids, 103 224-237 (2017)
  38. Charge transfer and weak bonding between molecular oxygen and graphene zigzag edges at low temperatures, D. Boukhvalov, V. Osipov, A. Shames, T. Hayashi, K. Takai, T. Enoki, Carbon 107 800-810 (2016)
  39. Size-dependent Raman and SiV-center luminescence in polycrystalline nanodiamonds produced by shock wave synthesis, K. Bogdanov, V. Osipov, M. Zhukovskaya, C. Jentgens, F. Treussart, T. Hayashi, K. Takai, A. Fedorov, A. Baranov, RSC Advances 6 51783-51790 (2016)
  40. Structural analysis of polycrystalline graphene systems by Raman spectroscopy, J. Ribeiro-Soares, M. E. Oliveros, C. Garin, M. V. David, L. G. P. Martins, C. A. Almeida, E. H. Martins-Ferreira, K. Takai, T. Enoki, R. Magalhaes-Paniago, A Malachias, A. Jorio, B. S. Archanjo, C. A. Achete, and L. G. Cancado, Carbon 95 646-652 (2015)
  41. Magnetic studies of detonation nanodiamond with surface modified with gadolinium ions, V. Yu Osipov, A. E. Aleksenskiy, K. Takai, and A. Ya. Vul', Physics of the Solid State 57 2314-2319 (2015)
  42. Diamagnetism of carbon onions probed by NMR of adsorbed water, A. M. Panich, V. Yu. Osipov and K. Takai, New Carbon Mater. 29 392-397 (2014)
  43. A quantitative analysis of carbon edge sites and an estimation of graphene sheet size in high-temperature treated, non-porous carbons, T. Ishii, S. Kashihara, Y. Hoshikawa, J. Ozaki, N. Kannari, K. Takai, T. Enoki, and T. Kyotani, Carbon 80 135-145 (2014)
  44. Preferential oxidation-induced etching of zigzag edges in nanographene, J. Takashiro, Y. Kudo, S. J. Hao, K. Takai, D. N. Futaba, T. Enoki, M. Kiguchi, Phys. Chem. Chem. Phys. 16 21363-21371 (2014)
  45. Heat treatment effect on the electronic and magnetic structures of nanographene sheets investigated through electron spectroscopy and conductance measurementsand conductance measurements, J. Takashiro, Y. Kudo, S. Kaneko, K. Takai, T. Ishii, T. Kyotani, T. Enoki and M. Kiguchi, Phys. Chem. Chem. Phys. 16 7280-7289 (2014)
  46. Magnetic edge-states in nanographene, HNO3-doped nanographene and its residue compounds of nanographene-based nanoporous carbon, S. Hao, V. L. J. Joly, S. Kaneko, J. Takashiro, K. Takai, H. Hayashi, T. Enoki and M. Kiguchi, Phys. Chem. Chem. Phys. 16 6273-6282 (2014)
  47. Development of edge state on graphite surface induced by Ar+ irradiation studied using near-edge X-ray absorption fine structure spectroscopy, Y. Kudo, M. Kiguchi, J. Takashiro, K. Takai, and T. Enoki, Carbon 72 152-159 (2014)
  48. Annealing-induced structural changes of carbon onions: High-resolution transmission electron microscopy and Raman studies , K. Bogdanov, A. Fedorov, V. Osipov, T. Enoki, K. Takai, T. Hayashi, V. Ermakov, S. Moshkalev, and A. Baranov, Carbon 73 78-86 (2014)
  49. Anomalous metallic-like transport of Co-Pd ferromagnetic nanoparticles cross-linked with π-conjugated molecules having a rotational degree of freedom, Y. Ito, K. Takai, A. Miyazaki, V. Sivamurugan, M. Kiguchi, Y. Ogawa, N. Nakamura, S. Valiyaveettil, T. Tada, S. Watanabe and T. Enoki, Phys. Chem. Chem. Phys. 16 288-296 (2014)
  50. Magnetic Torque Studies of π?d System κ-(BDH-TTP)2FeX4 (X = Br, Cl), K. Sugii, K. Takai, S. Tsuchiya, S. Uji, T. Terashima, H. Akutsu, A. Wada, S. Ichikawa, J. Yamada, and T. Enoki, J. Phys. Soc. Jpn. 83 023704(1-4) (2014)
  51. Polaron coupling in graphene field effect transistors on patterned self-assembled monolayer , K. Yokota, K. Takai, Y. Kudo, Y. Sato and T. Enoki, Phys. Chem. Chem. Phys. 16 4313-4319 (2014)
  52. Crystal Structure and Physical Properties of π?d System κ-(BDH-TTP)2FeBr4 , K. Sugii, K. Takai, S. Uji, T. Terashima, H. Akutsu, A. Wada, S. Ichikawa, J. Yamada, T. Mori and T. Enoki, J. Phys. Soc. Jpn. 82 054706(1-10) (2013)
  53. Magnetic and Transport Properties of　π-d System κ-(BDH-TTP)2FeCl4 , K. Sugii, K. Takai, S. Uji, T. Terashima, H. Akutsu, A. Wada, S. Ichikawa, J. Yamada, and T. Enoki, J. Phys. Soc. Jpn. 82 124709(1-8) (2013)
  54. Spin-spin interactions between π-electronic edge-localized spins and molecular oxygen in defective carbon nano-onions , A.I. Shames, V. Yu Osipov, A. Ya Vul’, Y. Kaburagi, T. Hayashi, K. Takai, and T. Enoki, Carbon 61 173-189 (2013)
  55. Electron transport properties of graphene with charged impurities and vacancy defects , Y. Kudo, K. Takai, and T. Enoki, J. Mater. Res. 28 1097 - 1104 (2013)
  56. Probing the catalytic activity of porous graphene oxide and the origin of this behaviour , C. Su, M. Acik, K. Takai, J. Lu, S. Hao, Y. Zheng, P. Wu, Q. Bao, T. Enoki, Y. J. Chabal, and K. P. Loh, Nature Communications 3 1298 (2013)
  57. Zigzag and armchair edges in graphene , T. Enoki, S. Fujii, and K. Takai, Carbon 50 3141-3145 (2012)
  58. Magnetic Properties of Host-Guest Material Using Network of Curved Nanocarbon Sheet , K. Takai, T. Suzuki, H. Nishihara, T. Kyotani, and T. Enoki,　 J. Phys. Chem. Solids 73 1436-1439 (2012)
  59. Magnetic Edge State of Nanographene and Unconventional Nanographene-Based HostGuest, Systems, T. Enoki, K. Takai, and M. Kiguchi　 Bull. Chem. Soc. Jpn. 85 249-264 (2012)
  60. Nanographene-Based Host-Guest Systems, T. Enoki and K. Takai, J. Phys. Chem. Solids 73 1408-1413 (2012)
  61. Magnetism of HNO3-Adsorbed Nanoporous Network of Nanographene Sheets , S. Hao, K. Takai, V. L. J. Joly, and T. Enoki, J. Phys. Chem. Solids 73 1432-1435 (2012)
  62. Magnetic Properties and Interplay between Nanographene Host and Nitric Acid Guest in Nanographene-based Nanoporous Carbon , S. Hao, K. Takai, V. L. J. Joly, K. Yokota, M. Kiguchi and T. Enoki , Bull. Chem. Soc. Jpn. 85 376-388 (2012)
  63. Carrier Controlof Graphene Driven by the Proximity Effect of Functionalized Self-assembled Monolayers , K. Yokota, K. Takai, and T. Enoki, Nano. Lett. 11 3669-3675 (2011)
  64. Electrically Controlled Adsorption of Oxygen in Bilayer Graphene Devices , Y. Sato, K. Takai, and T. Enoki, Nano Lett. 11 3468-3475 (2011)
  65. Magnetic Sponge Prepared with an Alkanedithiol-Bridged Network of Nanomagnets , Y. Ito, A. Miyazaki, K. Takai, V. Sivamurugan, T. Maeno, T. Kadono, M. Kitano, Y. Ogawa, N. Nakamura, M. Hara, S. Valiyaveettil, and T. Enoki, Journal of the American Chemical Society 133 11470-11473 (2011)
  66. Ferromagnetic Enhancement in the Clusters of Co-Pd Magnetic Nanoparticles Induced by the Formation of Cross-Linkage, 　Y. Ito, K. Takai, T. Enoki,　 J. Phys. Chem. C 115 8971-8975 (2011)
  67. Magnetic edge state and dangling bond state of nanographene in activated carbon fibers, 　M. Kiguchi, K. Takai, V. L. J. Joly, T. Enoki, R. Sumii, K. Amemiya,　 Phys. Rev. B 84 045421(1-6) (2011)
  68. ESR in a disordered network of nanographene sheets, 　M. Hagiwara, H. Tsugeno, H. Yamaguchi, V. L. J. Joly, K. Takai, and T. Enoki,　 J. Phys. Conf. Series 334 012040(1-5) (2011)
  69. Diagnostics of Plasmon Resonance in Optical Absorption Spectra of Nanographite Aqueous Suspensions , V. Yu. Osipov, M. S. Shestakov, A. V. Baranov, V. A. Ermakov, A. I. Shames, K. Takai, T. Enoki, Y. Kaburagi, T. Hayashi, M. Endo, and A. Ya. Vul',　 Optics and Spectroscopy 111 220-223 (2011)
  70. Raman characterization and UV optical absorption studies of surface plasmon resonance in nanographite , V.Yu. Osipov, T.L. Makarova,　A.V. Baranov, V.　I. Ermakov, L. F. Chungong, A. I. Shames, K. Takai, T. Enoki, Y. Kaburagi, M. Endo, A.Ya. Vul', Diamond and Related Materials 20 205-209 (2011)
  71. Observation of magnetic edge state in graphene nanoribbons , V. L. J. Joly, M. Kiguchi, S. Hao, K. Takai, T. Enoki, R. Sumii, K. Amemiya, H. Muramatsu, T. Hayashi, Y. Kim, M. Endo, J. Delgado, F. L?pez-Ur?as, A. M?ndez, H. Terrones, M. Terrones, and M. S. Dresselhaus,　 Phys. Rev. B 81 245428(1-6) (2010)
  72. Structure and magnetic properties of curved graphene networks and the effects of bromine and potassium adsorption systems, 　K. Takai,. T. Suzuki, T. Enoki, H. Nishihara and T. Kyotani,　 Phys. Rev. B 81 205420(1-12) (2010)
  73. Effect of electron localization on the edge-state spins in a disordered network of nanographene sheets ,　V. L. J. Joly, K. Takahara, K. Takai, K. Sugihara, T. Enoki, M. Koshino and H. Tanaka,　 Phys. Rev. B 81 115408(1-6) (2010)
  74. 　Charge transfer and weak chemisorption of oxygen molecules in nanoporous carbon consisting of a disordered network of nanographene sheets,　 　G. U. Sumanasekera, G. Chen, K. Takai, J. Joly N. Kobayashi, T. Enoki, and P. C. Eklund,　 J. Phys. Condens. Matter 22 334208(1-8) (2010)
  75. Interaction between edge-localized oxygen in multishell nanographites derived from nanodiamonds ,　V. Yu. Osipov, A.I. Shames, T. Enoki, K. Takai, M. Endo, Y. Kaburagi, and A.Ya. Vul',　 Diamond and Related Materials 19 492-495 (2010)
  76. Electric field induced sp3-to-sp2 conversion and nonlinear electron transport in iron-doped diamond-like-carbon thin film, 　Xi Liao, Xi. Zhang, K. Takai, and T. Enoki,　 J. Appl. Phys. 107 013709(1-7) (2010)
  77. Magnetic and EPR Studies of Edge-Localized Spin Paranagnetism in Multi-shell Nanographites Derived from Nanodiamonds, 　V. Yu. Ossipov, A. I. Shames, T. Enoki, K. Takai, M. Endo, T. Hayashi, Y. Kaburagi, A. Y. Vul',　 Diamond and Related Materials 18 220-223 (2009)
  78. Honeycomb Superperiodic Pattern and its Fine Structure near the Armchair Edge of Graphene observed by Low-temperature Scanning Tunneling Microscopy, 　K. Sakai, K. Takai, K. Fukui, and T. Enoki,　 Phys. Rev. B 81 235417(1-7) (2010)
  79. Kohn Anomalies in Graphene Nanoribbons, 　K. Sasaki, R. Saito, M. S. Dresselhaus, S. Murasaki, K. Takai, T. Mori, and T. Enoki,　 Phys. Rev. B 80 155450(1-11) (2009)
  80. Magnetism of nanographene network influenced by the interaction with acid species, 　T. Enoki, S. Tsuge, S. Hao, K. Takai, K. Nakajima, M. Hara, and F. Y. Kang,　 J. Phys. Chem. Solids 71 534-538 (2010)
  81. Oxgen guest molecules in the nanopores of nanographite-network, 　V. L. Joseph Joly, K. Takai, and T. Enoki,　 J. Phys. Chem. Solids 71 575-578 (2010)
  82. Anomalous Magnetotransport in Nanostructured graphene, 　K. Takai, Y. Nishimura, and T. Enoki,　 Physica E 42 680-683 (2010)
  83. Fabrication and characterization of Magnetic Nanoporous Zeolite Templated Carbon, 　K. Takai, T. Suzuki, T. Enoki, H. Nishihara, T. Kyotani,　 J. Phys. Chem. Solids 71 565-568 (2010)
  84. Structure and Magnetic Properties of Detonation Nanodiamond Chemically Modified by Copper, 　A. Shames, A. M. Panich, V. Osipov, A. Aleksenskiy, A. Vul', T. Enoki, and K. Takai,　 J. Appl. Phys. 107 014318(1-10) (2010)
  85. The Edge-state of nanographite and the magnetism of the edge-state spins, T. Enoki and K. Takai, Solid State Commun. 149 1144-1150 (2009)
  86. Nanographene and Nanodiamond; New Members in the Nanocarbon Family,　T. Enoki, K. Takai, V. Osipov, M. Baidakova, and Alexander Vul’,　 Chemistry-An Asian Journal(FocusReview) 4 796-804 (2009)
  87. Unconventional electronic and magnetic functions of nanographene-based host-guest systems, T. Enoki and K. Takai, Dalton Trans. 37 3773?3781 (2008)
  88. Mechanical compression induced short-range ordering of nanographene spins, 　K. Takahara, S. Hao, H. Tanaka, T. Kadono, M. Hara, K. Takai, and T. Enoki,　 Phys. Rev. B 82 121417R(1-4) (2010)
  89. In-situ synthesis and magnetic anisotropy of ferromagnetic buckypaper, 　R. Lv, S. Tsuge, X. Gui, K. Takai, F. Kang, T. Enoki, J. Wei, J. Gu, K. Wang, and D. Wu,　 Carbon 47 1141-1145 (2009)
  90. Magnetotransport of nanoporous nanographite domain network and its oxgen-adsorption effect, 　K. Sugihara, K. Takahara, K. Takai, and T. Enoki,　 J. Phys. Chem. Solids 69 1155-1157 (2008)
  91. Magnetic Potassium clusters in a Nanographite-based Nanoporous System, 　K. Takai, S. Eto, M. Inaguma, T. Enoki,　 J. Phys. Chem. Solids 69 1182-1184 (2008)
  92. Paramagnetic defects and exchange coupled spins in pristine ultrananocrystalline diamonds, 　V. Yu, Osipov, A. I. Shames, T. Enoki, K. Takai, M. V. Baidakova, A. Ya Vul',　 Diamond and Related Materials 16 2035-2038 (2007)
  93. Electronic and magnetic properties of acid-adsorbed nanoporous activated carbon fibers, 　S. Hao, K. Takai, K. Feiyu, T. Enoki,　 Carbon 46 110-116 (2008)
  94. Measuring the degree of stacking order in graphite by Raman spectroscopy, 　L. G. Cancado, K. Takai, T. Enoki, M. Endo, Y. A. Kim, H. Mizusaki, N. L. Speziali, A. Jorio, M. A. Pimenta,　 Carbon 46 272-275 (2008)
  95. Structures and electronic properties of surface/edges of nanodiamond and nanographite, 　T. Enoki, Y. Kobayashi, C. Katsuyama, V. Yu Osipov, M. Baidakova, K. Takai, K. Fukui, A. Ya Vul',　 Diamond and Related Materials 16 2029-2034 (2007)
  96. Fabrication of graphitic nanowire structure by electron beam lithography, K. Takai and T. Enoki, Physica E 40 321-323 (2007)
  97. Magnetic potassium clusters in a nanographite host system, 　K. Takai, S. Eto, M. Inaguma, T. Enoki, H. Ogata, M. Tokita, and J. Watanab,e　 Phys. Rev. Lett. 98 17203(1-4) (2007)
  98. Host-guest interaction effect on electron transport in disordered network of nanographite domains, 　K. Sugihara, K. Takahara, K. Takai, and T. Enoki,　 Phys. Rev. B 75 205422(1-8) (2007)
  99. Effect of oxygen adsorption on the magnetoresistance of a disordered nanographite network, 　K. Takahara, K. Takai, T. Enoki, and K. Sugihara,　 Phys. Rev. B 76 035442(1-9) (2007)
  100. Magnetic properties of hydrogenated and fluorinated surface layer of diamond nanoparticles, 　M. V. Baidakova, V. Yu. Osipov, C. Katsuyama, K. Takai, T. Enoki, A. Yonemoto, H. Touhara, and A. Ya. Vul,　 Royal Society of Chemistry (Multifunctional Conducting Molecular Materials) 306 224-231 (2007)
  101. Magnetic properties of hydrogen-terminated surface layer of diamond nanoparticles, 　V. Yu. Osipov, M. Baidakova, K. Takai, T Enoki, A. Vul',　 　Fullerenes, Nanotubes, and Carbon Nanostructures　 14 565-572 (2006)
  102. General equation for the determination of the crystallite size La of nanographite by Raman spectroscopy, 　L. G. Can?ado, K. Takai, T. Enoki, M. Endo, Y. A. Kim, H. Mizusaki, A. Jorio, L. N. Coelho, R. Magalhes-Paniago, and M. A. Pimenta,　 Appl. Phys. Lett. 88 163106(1-3) (2006)
  103. Bromine Adsorption-Induced Change in Electronic and Magnetic Properties of Nanographite Network Systems, 　K. Takai, H. Kumagai, H. Sato, T. Enoki,　 Phys. Rev. B 73 035435 1-13 (2006)
  104. Magnetic Defects in Pristine and Hydrogen-Terminated Nanodiamonds ,　V. Yu. Osipov, M. Baidakova, K. Takai, T. Enoki, A. Vul’,　 　NATO Science Series II: Mathematics, Physics and Chemistry, Nato Advanced Research Workshop, 　　Nano-electronic Semiconductor Devices　　, Ed. by Evgeni Gusev, Nato Sci. Ser., Springer　 220 447-456 (2006)
  105. Magnetic and high resolution TEM studies of nanographite derived from nanodiamond,　V. Yu. Osipov, T. Enoki, K. Takai, K. Takahara, M. Endo, T. Hayashi, Y. Hishiyama, Y. Kaburagi, and A. Ya Vul,　 Carbon 44 1225-1234 (2006)
  106. Anisotropy of the Raman Spectra of Nanographite Ribbons, 　L. G. Cancad, M. A. Pimenta, B. R. A. Neves, G. Medeiros, T. Enoki, Y. Kobayashi, K. Takai, K. Fukui, and M. S. Dresselhaus, R. Saito, A. Jolio,　 Phys. Rev. Lett. 93 047403(1-4) (2004)
  107. Development of TTF-based self-assembled monolayer systems and their electronic properties, 　T. Enoki, Y. Yokota, R. Yuge, W. Tu, A. Miyazaki, K. Takai, and K. Fukui　, J. Physique IV France 114 667-671 (2004)
  108. Synthesis and characteristics of iron nanoparticles in a carbon matrix along with the catalytic graphitization of amorphous carbon, 　E. P. Sajitha, V. Prasad, S. V. Subramanyam, S. Eto, K. Takai, and T. Enoki　 Carbon 42 2815-2820 (2004)
  109. STM Observation of Electronic Wave Interference Effect in Finite-Sized Graphite with Distortion-Network Structures, 　Y. Kobayashi, K. Takai, K. Fukui, T. Enoki, K. Harigaya, Y. Kaburagi, and Y. Hshiyama,　 Phys. Rev. B 69 035418(1-7) (2004)
  110. Metal-Insulator transition in iodinated amorphous conducting carbon films, 　L. Kumari, S. V. Subramanyam, S. Eto, K. Takai, and T. Enoki,　 Carbon 42 2133-2137 (2004)
  111. Effect of Heat-Treatment on Magnetic Properties of Non-Graphitic Disordered Carbon,　K. Takai, M. Oga, T. Enoki, and A. Taomoto,　 Diamond and Related Materials 13 1469-1473 (2004)
  112. Turning Magenetism and Novel Electronic Wave Interference Patterns in Nanographite materials, 　K. Harigaya, Y. Kobayashi, N. Kawatsu, K. Takai, H. Sato, J. Ravier, T. Enoki, and M. Endo,　 Physica E 22 708-711 (2004)
  113. Interface Effect othe Electronic Structure of Alkanethiol-coated Platimum Nanoparticles, 　W. Tu, K. Takai, K. Fukui, A. Miyazaki, and T. Enoki,　 J. Phys.Chem. B 107 10134 -10140 (2003)
  114. 　STM observation of the quantum interference effect in finite-sized graphite,　 　Y. Kobayashi, K. Takai, K. Fukui, T. Enoki, K. Harigaya, Y. Kaburagi, and Y. Hishiyama, 　 J. Phys. Chem. Solid 65 199-203 (2004)
  115. Theoretical Study on Novel Elecronic Properties in Nanographite Materials, 　K. Harigaya, A. Yamashiro, Y. Shiomi, K. Wakabayashi, Y. Kobayashi, N. Kawatsu, K. Takai, H. Sato, J. Ravier, T. Enoki, and M. Endo,　 J. Phys. Chem. Solid. 65 123-126 (2004)
  116. Resonance Raman Scattering in Carbon Nanotubes and Nanographites, 　M. A. Pimenta, A. Jorio, M. S. S. Dantas, C. Fantini, M. de Souza, L. G. Cancado, Ge. G. Samsonidze, G. Dresselhaus, M. S. Dresselhaus, A. Gruneis, R. Saito, A. G. Souza Filho, Y. Kobayashi, K. Takai, K. Fukui, and T. Enoki,　 AIP Conf. Proc. 685 219-224 (2003)
  117. Structure and Electronic Properties of Non-Graphitic Disordered Carbon System and its Heat-Treatment Effect, 　K. Takai, M. Oga, H. Sato, T. Enoki, Y. Ohki, A. Taomoto, K. Suenaga, and S. Iijima,　 Phy. Rev. B 67 214202-214212 (2003)
  118. Structure and Electronic Properties of Diamond-Like Carbon and its Heat-Treatment Effect, 　K. Takai, M. Oga, H. Sato, T. Enoki, Y. Ohki, A. Taomoto, K. Suenaga, and S. Iijima,　 　Mater, Res. Soc. Symp. Proc., 　Electrically Based Microstructural Characterization III　　 699 347-352 (2002)
  119. Structure and Electronic Properties of sp2/ sp3 Mixed Nano-Carbon Systems, 　T. Enoki, B. L. V. Prasad, K. Takai, and H. Sato,　 Mol. Cryst. Liq. Cryst. , 386 145-149 (2002)
  120. Novel Electronic Wave Interference Patterns in Nanographen Sheets,　K. Harigaya, Y. Kobayashi, K. Takai, J. Ravier, and T. Enoki,　 　J. Phys,: Condensed Matters　 14 L605-L611 (2002)
  121. Effect of Fluorination on Nano-Sized p-Electron Systems, 　K. Takai, H. Sato, T. Enoki, N. Yoshida, F. Okino, H. Touhara, and M. Endo,　 J. Phys. Soc. Jpn. 70 175-185 (2001)
  122. Fluorine-introduced sp3-carbon sites in a nano-sized p-electron system and their effects on the electronic properties, 　K. Takai, H. Sato, T. Enoki, N. Yoshida, F. Okino, H. Touhara, and M. Endo　 Mol. Cryst. Liq. Cryst. , 340 289-294 (2000)
  123. Host-Guest Systems in Microporous Carbons, 　T. Enoki, K. Takai, Y. Shibayama, N. Kobayashi, A. Nakayama, H. Sato, N. Yoshida, and H. Touhara　 　Mater. Res. Soc. Symp. Proc., 　　Solid State Ionics V,　 548 3-14 (2000)