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産業技術総合研究所


名前: 関和彦
生年月日: 11月25日,1965年
写真と似顔絵
趣味: ランニング、合奏(ピアノ、リコーダー)、 テニス

住所:

関和彦
ナノシステム研究部門
産業技術総合研究所
茨城県つくば市東1ー1ー1 305-8565
電話: (0298) 61-4526
FAX: (0298) 61-4526
E-mail: k-seki (@aist.go.jp)

主な研究テーマ

論文リスト

  1. D. HK Murthy, H. Matsuzaki, J. Liu, Y. Suzuki, T. Hisatomi, K. Seki, K. Domen and A. Furube, , Transient Absorption Spectroscopy Reveals Performance-Limiting Factors in a Narrow-Bandgap Oxysulfide La5(Ti0.99Mg0.01)2CuS5O6.99 Photocatalyst for H2 Generation J. Phys. Chem. C 123 14246-14252 (2019).
  2. D. HK Murthy, H. Matsuzaki, Z. Wang, Y. Suzuki, T. Hisatomi, K. Seki, Y. Inoue, K. Domen and A. Furube , , Origin of the overall water splitting activity of Ta3N5 revealed by ultrafast transient absorption spectroscopy Chem. Sci., 10 5353-5362 (2019).
  3. K. Seki, and K. Marumoto, Motional narrowing under Markovian and non-Markovian hopping transitions in inhomogeneous broadened absorption line shape, Phys. Rev. E 99, 052115 (2019).
  4. T. Higashi H. Nishiyama Y. Suzuki Y. Sasaki T. Hisatomi, M. Katayama , T. Minegishi, K. Seki, T. Yamada, and K. Domen, Transparent Ta3N5 Photoanodes for Efficient Oxygen Evolution toward the Development of Tandem Cells, Angew. Chem. Int. Ed., 58 2300-2304 (2019).
  5. D. HK Murthy, H. Matsuzaki, Q. Wang, Y. Suzuki, K. Seki, T. Hisatomi, T. Yamada, A. Kudo, K. Domen, and A. Furube, , Revealing the role of the Rh valence state, La doping level and Ru cocatalyst in determining the H 2 evolution efficiency in doped SrTiO 3 photocatalysts Sustainable Energy & Fuels, 3 208-218 (2019).
  6. K. Seki, Jellium Edge and Size Effect of Chemical Potential and Surface Energy in Metal Slabs, J. Phys. Soc. Jpn. 87, 124707 (2018) [6 Pages].
  7. K. Seki, Y. Sonoda, and R. Katoh, Diffusion-Mediated Delayed Fluorescence by Singlet Fission and Geminate Fusion of Correlated Triplets, J. Phys. Chem. C, 122, 11659-11670 (2018).
  8. G. Ma, Y. Kuang, D. H. K. Murthy, T. Hisatomi, J. Seo, S. Chen, H. Matsuzaki, Y. Suzuki, M. Katayama, T. Minegishi, K. Seki, A. Furube, and K. Domen, Plate-like Sm2Ti2S2O5 Particles Prepared by a Flux-Assisted One-Step Synthesis for the Evolution of O2 from Aqueous Solutions by Both Photocatalytic and Photoelectrochemical Reactions, J. Phys. Chem. C,122, 13491-13499 (2018).
  9. Y. Suzuki, and K. Seki, Possible influence of the Kuramoto length in a photo-catalytic water splitting reaction revealed by Poisson-Nernst-Planck equations involving ionization in a weak electrolyte, Chem. Phys., 502, 39-49 (2018).
  10. Y. Suzuki, D. H. K. Murthy, H. Matsuzaki, A. Furube, Q. Wang, T. Hisatomi, K. Domen, and K. Seki, Rational Interpretation of Correlated Kinetics of Mobile and Trapped Charge Carriers: Analysis of Ultrafast Carrier Dynamics in BiVO4, J. Phys. Chem. C, 121 (35), 19044-19052 (2017).
  11. Z. Li, P. He, H. Chong, A. Furube, K. Seki, H.-h. Yu, K. Tajima,Y. Ito, and M. Kawamoto, Direct Aqueous Dispersion of Carbon Nanotubes Using Nanoparticle-Formed Fullerenes and Self-Assembled Formation of p/n Heterojunctions with Polythiophene, ACS Omega 2, 1625-1632 (2017).
  12. J. Liu, T. Hisatomi, D. H. K. Murthy, M. Zhong, M. Nakabayashi, T. Higashi, Y. Suzuki, H. Matsuzaki, K. Seki, A. Furube, N. Shibata, M. Katayama, T. Minegishi, and K. Domen, Enhancement of Charge Separation and Hydrogen Evolution on Particulate La5Ti2CuS5O7 Photocathodes by Surface Modification, J. Phys. Chem. Lett. 8, 375-379 (2017).
  13. Q. Wang, T. Hisatomi, Y. Suzuki, Z. Pan, J. Seo, M. Katayama, T. Minegishi, H. Nishiyama, T. Takata, K. Seki, A. Kudo, T. Yamada, and K. Domen, Particulate Photocatalyst Sheets Based on Carbon Conductor Layer for Efficient Z-Scheme Pure-Water Splitting at Ambient Pressure, J. Am. Chem. Soc. 139, 1675-1683 (2017).
  14. K. Seki and M. Wojcik, Electric Field-Assisted Dissociation Yield of Bound Charge Pairs in Low Permittivity Materials, J. Phys. Chem. C 121, 3632-3641 (2017).
  15. M. Wojcik, A. Nowak and K. Seki, Geminate electron-hole recombination in organic photovoltaic cells. A semi-empirical theory, J. Chem. Phys. 146, 054101 (15 pages) (2017).
  16. Y. Suzuki, R. B. Singh, H. Matsuzaki, A. Furube, G. Ma, T. Hisatomi, K. Domen, and K. Seki, Rationalizing long-lived photo-excited carriers in photocatalyst (La5Ti2CuS5O7) in terms of one-dimensional carrier transport, Chem. Phys. 476, 9-16 (2016).
  17. K. Seki, Equivalent circuit representation of hysteresis in solar cells that considers interface charge accumulation: Potential cause of hysteresis in perovskite solar cells, Appl. Phys. Lett. 109, 033905(4 pages) (2016).
  18. K. Seki and M. Wojcik, Temperature scaling of effective polaron mobility in energetically disordered media, J. Chem. Phys. 145 034106 (9 pages) (2016).
  19. K. Seki, K. Bagchi and B. Bagchi, Anomalous dimensionality dependence of diffusion in a rugged energy landscape: How pathological is one dimension?, J. Chem. Phys. 144, 194106 (2016); doi:10.1063/1.4948936.
  20. K. Odagiri and K. Seki, Coil-globule transition of a polymer involved in excluded-volume interactions with macromolecules, J. Chem. Phys. 143, 134903 (2015); doi:10.1063/1.4932344.
  21. K. Seki and B. Bagchi, Relationship between entropy and diffusion: A statistical mechanical derivation of Rosenfeld expression for a rugged energy landscape, J. Chem. Phys. 143, 194110 (2015); doi:0.1063/1.4935969.
  22. G. Ma, Y. Suzuki, R. B. Singh, A. Iwanaga, Y. Moriya, T. Minegishi, J. Liu, T. Hisatomi, H. Nishiyama, M. Katayama, K. Seki, A. Furube, T. Yamada and K. Domen, Photoanodic and photocathodic behaviour of La5Ti2CuS5O7 electrodes in the water, Chem. Sci. 6, 4513-4518 (2015); doi:10.1039/C5SC01344E.
  23. T. Miura and K. Seki, Diffusion Influenced Adsorption Kinetics, J. Phys. Chem. B, 119 (34), pp 10954-10961 (2015); doi:10.1021/acs.jpcb.5b00580.
  24. T. Miura and K. Seki, Effects of surface affinity on the ordering dynamics of self-assembled monolayers of chain molecules: Transition from a parallel to a perpendicular structure, Phys. Rev. E 91, 052604 (2015); doi:10.1103/PhysRevE.91.052604.
  25. Y. Suzuki, A. Furube, R. B. Singh, H. Matsuzaki, T. Minegishi, T. Hisatomi, K. Domen, and K. Seki, Kinetics of Distance-Dependent Recombination between Geminate Charge Carriers by Diffusion under Coulomb Interaction , J. Phys. Chem. C, 119 (10), pp 5364-5373 (2015); doi:10.1021/acs.jpcc.5b00417.
  26. T. Akimoto and K. Seki, Transition from distributional to ergodic behavior in an inhomogeneous diffusion process: Method revealing an unknown surface diffusivity, Phys. Rev. E 92(2),022114 (2015); doi:10.1103/PhysRevE.92.022114.
  27. R. B. Singh, H. Matsuzaki, Y. Suzuki, K. Seki, T. Minegishi, T. Hisatomi, K. Domen, and A. Furube, Trapped State Sensitive Kinetics in LaTiO2N Solid Photocatalyst with and without Cocatalyst Loading, J. Am. Chem. Soc., 136 (49), pp 17324-17331 (2014); doi:10.1021/ja5102823.
  28. L. Zhang, T. Minegishi, M. Nakabayashi, Y. Suzuki, K. Seki, N. Shibata, J. Kubotaa and K. Domen, Durable hydrogen evolution from water driven by sunlight using (Ag,Cu)GaSe2 photocathodes modified with CdS and CuGa3Se5, Chem. Sci., 6, 894-901(2015); doi:10.1039/C4SC02346C.
  29. S Banerjee, R Biswas, K Seki, B. Bagchi, Diffusion on a rugged energy landscape with spatial correlations, J. Chem. Phys. 141, 124105 (2014); doi: 10.1063/1.4895905.
  30. K. Seki, Overall current-voltage characteristics of space charge controlled currents for thin films by a single carrier species, J. Appl. Phys. 116, 063716 (2014); doi:10.1063/1.4892987.
  31. K. Seki, K. Marumoto, and M. Tachiya, Effect of Energetic Disorder on the Open-Circuit Voltage in Organic Bulk Heterojunction Composites, Jpn. J. Appl. Phys. 53, 01AB13 (2014).
  32. K. Seki, A. Furube, and Y. Yoshida, Theoretical limit of power conversion efficiency for organic and hybrid halide perovskite photovoltaics, Jpn. J. Appl. Phys. 54, 08KF04 (2015); doi: 10.7567/JJAP.54.08KF04.
  33. K. Seki, A. Furube, and Y. Yoshida, Response to "Comment on 'Detailed balance limit of power conversion efficiency for organic photovoltaics'" [Appl. Phys. Lett. 104, 146101 (2014)], Appl. Phys. Lett. 104, 146102 (2014); doi: 10.1063/1.4870340.
  34. K. Seki, S. Mogre, and S. Komura, Diffusion coefficients in leaflets of bilayer membranes, Phys. Rev. E 89, 022713 (2014); doi: 10.1103/PhysRevE.89.022713.
  35. K. Seki, A. Furube, and Y. Yoshida, Detailed balance limit of power conversion efficiency for organic photovoltaics, Appl. Phys. Lett. 103, 253904 (2013); doi: 10.1063/1.4852676.
  36. K. Seki, K. Marumoto, and M. Tachiya, Bulk Recombination in Organic Bulk Heterojunction Solar Cells under Continuous and Pulsed Light Irradiation, Appl. Phys. Express 6, 051603 (4pp) (2013).
  37. K. Seki, S. Komura, and S. Ramachandran, Growth kinetics of circular liquid domains on vesicles by diusion-controlled coalescence, J. Phys.: Condens. Matter 25, 195105 (8pp) (2013).
  38. S. Komura, S. Ramachandran, and K. Seki, Lateral dynamics in polymer-supported membranes, Materials 5, 1923-1932 (2012).
  39. K. Seki, A. Ballal, and M. Tachiya, Site Blocking Effect on Diffusion-Mediated Reactions in Porous Media, J. Phys. Chem. C 116 (41), 22086-22093 (2012).
  40. C.-Y. David Lu, S. Komura, and K. Seki, Viscoelasticity of two-layer vesicles in solution, Phys. Rev. E. 86, 061401 (2012) [11pages].
  41. K. Odagiri, K. Seki, and K. Kudo, Ring formation by competition between entropic effect and ther- mophoresis, Soft matter Soft matter 8, 6775-6781 (2012).
  42. S. Komura, S. Ramachandran, and K. Seki, Anomalous lateral diffusion in a viscous membrane surrounded by viscoelastic media, Eur. Phys. Lett. 97, 68007(2012).
  43. K. Seki, M. Wojcik and M. Tachiya, Diffusion-mediated geminate reactions under excluded volume interactions, Phys. Rev. E 85, 011131(13 pages) (2012).
  44. K. Seki, S. Ramachandran and S. Komura, Diffusion coefficient of an inclusion in a liquid membrane supported by a solvent of arbitrary thickness, Phys. Rev. E 84, 021905 (10 pages) (2011) . Appeared in APS Physics Synopsis (4 August, 2011).
  45. S. Ramachandran, S. Komura, K. Seki and G. Gompper, Dynamics of a polymer chain confined in a membrane, accepted for the publication in Eur. Phys. J. E 34, 11046-3 (2011).
  46. S. Ramachandran, S. Komura, K. Seki and M. Imai, Hydrodynamic effects on concentration fluctuations in multicomponent membranes, Soft Matter 7, 1524-1531 (2011).
  47. K. Seki, M. Wojcik and M. Tachiya, Effects of excluded volume interaction and dimensionality on diffusion-mediated reactions, J. Chem. Phys. 134, 094506 ( 2011).
  48. K. Seki, and M. Tachiya, Photoisomerization kinetics in solid states: Origin of induction period, Chem. Phys. Lett. 495, 218-221 (2010).
  49. M. Tachiya, and K. Seki, Theory of bulk electron-hole recombination in a medium with energetic disorder, Phys. Rev. B 82, 085201 (2010).
  50. S. Ramachandran, S. Komura, M. Imai, and K. Seki, Drag coefficient of a liquid domain in a two-dimensional membrane, Eur. Phys. J. E Soft Matter. 31, 303-310 (2010).
  51. K. Seki, S. Masuo, S. Abe, and M. Tachiya, Theoritical Study on Photon Emission Statistics from Single Conjugated Polymer Molecules Excited by Laser Pulses Synth. Met., 159, 769-772 (2009).
  52. K. Seki and M. Tachiya, Reaction under vacancy-assisted diffusion at high quencher concentration, Phys. Rev. E 80, 041120 (2009).
  53. K. Seki and M. Tachiya, Theory of antibunching of photon emission II, J. Chem. Phys. 130, 194507 (2009).
  54. M. Tachiya and K. Seki, Unified explanation of the fluorescence decay and blinking characteristics of semiconductor nanocrystals, Appl. Phys. Lett. 94, 081104(2009).
  55. K. Seki and M. Tachiya, Theory of antibunching of photon emission I, J. Chem. Phys. 130, 024706 (2009).
  56. K. Seki and H. Imamura, Nonequilibrium thermodynamic study of magnetization dynamics in the presence of spin-transfer torque, Phys. Rev. B 78, 060402(R) (2008) .
  57. K. Seki, B. Bagchi, and M. Tachiya, Orientational relaxation in a dispersive dynamic medium : Generalization of the Kubo-Ivanov-Anderson jump diffusion model to include fractional environmental dynamics, Phys. Rev. E 77, 031505 (2008).
  58. K. Seki, B. Bagchi, and M. Tachiya, Dynamics of barrierless and activated chemical reactions in dispersive medium within the fractional diffusion equation approach, J. Phys. Chem. B 112, 6107-6113 (2008).
  59. M. Tachiya, and K. Seki, Energy Gap Law of Electron Transfer in Nonpolar Solvents, J. Phys. Chem. A ,111, 9553(7pp) (2007).
  60. K. Seki, S. Komura, and M. Imai, Concentration fluctuations in binary fluid membranes, J. Phys.: Condens. Matter 19, No 7, 072101 (8pp) (2007).
  61. K. Seki and M. Tachiya, Theoretical model based on the memory effect for the strange photoisomerization kinetics of diarylethene derivatives dispersed on polymer films, J. Chem. Phys. 126, No. 4, 044904(8pages) (2007).
  62. J.-H. Kim, D. Huh, J. Lee, S. Lee, J. Sung, K. Seki, and M. Tachiya, Subdiffusion-assisted reaction kinetics in disordered media, J. Phys.: Condens. Matter 19, 065116 (14pp) (2007).
  63. K. Seki, A. I. Shushin, M. Wojcik, and M. Tachiya, Specific features of the kinetics of fractional-diffusion assisted geminate reactions, J. Phys.: Condens. Matter 19, 065117 (15pp) (2007).
  64. K. Seki, M. Wojcik, and M. Tachiya, Dispersive diffusion controlled distance dependent recombination in amorphous semiconductors, J. Chem. Phys. 124, 044702-1 -044702-9 (2006).
  65. K. Seki and M. Tachiya, Photo-driven directional motion of droplets on the surface of a liquid crystal doped with photochromic azobenzene: Theory, J. Phys.: Condens. Matter 17, S4229-S4237 (2005).
  66. K. Seki, K. Murayama and M. Tachiya, Dispersive photoluminescence decay by geminate recombination in amorphous semiconductors, Phys. Rev. B 71, 235212(-1)-235212(-7) (2005).
  67. K. Seki, A. Masuda, K. Ushida, and M. Tachiya, A Theoretical Method to Analyze Diffusion of Probe Molecules in Nanostructured Fluids by Fluorescence Correlation Spectroscopy, J. Phys. Chem. A 109, 2421-2427 (2005).
  68. K. Seki, and M. Tachiya, Kinetics of photo-induced hydrophilic conversion processes of TiO2 surfaces, J. Phys. Chem. B 108, 4806-4810 (2004).
  69. K. Seki, M. Wojcik, and M. Tachiya, Recombination kinetics in subdiffusive media, J. Chem. Phys. 119, 7525-7533 (2003).
  70. K. Seki, M. Wojcik, and M. Tachiya, Fractional reaction-diffusion equation, J. Chem. Phys. 119, 2165-2170 (2003).
  71. K. Seki, S. D. Traytak, and M. Tachiya, Rigorous calculation of electric field effects on the free energy change of the electron transfer reaction, J. Chem. Phys. 118, 669-679 (2003).
  72. A. V. Barzykin, K. Seki and M. Tachiya, Diffusion-assisted long-range reaction between the ends of a polymer: Effective sink approximation, J. Chem. Phys. 117, 1377-1384(2002).
  73. A. V. Barzykin, P.A.Frantsuzov,K. Seki and M. Tachiya, Solvent Effects in Nonadiabatic Electron-Transfer Reactions: Theoretical Aspects, Adv. Chem. Phys. 123, 511-616, (2002).
  74. K. Seki and M. Tachiya, Electric Field Dependence of Charge Mobility in Energetically Disordered Materials: Polaron Aspects, Phys. Rev. B 65, 014305(2002).
  75. A. V. Barzykin, K. Seki and M. Tachiya, Kinetics of Diffusion-Assisted Reactions in Microheterogeneous Systems, Adv. Colloid Interface Sci. 82-90, 47-140 (2001).
  76. K. Seki and K. Miyazaki, "Mean Field Theory of Viscoelasticity of Nondilute Vesicle Dispersions", Proceedings of the 3rd Tohwa University International Meeting, "Statistical Physics", eds. M. Tokuyama and H. E. Stanley, American Institute of Physics , 751 (2000).
  77. K. Seki and M. Tachiya, Diffusion-assisted reaction through a fluctuating bottleneck, J. Chem. Phys. 113, 3441-3446 (2000).
  78. T. Bandyopadhyay, K. Seki and M. Tachiya, Theoretical analysis of the influence of stochastic gating on the transient effect in fluorescence quenching by electron transfer, J. Chem. Phys. 112, 2849-2862 (2000).
  79. A. V. Barzykin, K. Seki and M. Tachiya, Diffusion--Assisted Reactions on Micelle Surfaces: Exact Results and Approximations, J. Phys. Chem. B 103, 9156-9160 (1999).
  80. A. V. Barzykin, K. Seki and M. Tachiya, Theory of Diffusion--Assisted Reactions on Micelle Surfaces: Exact Results and Approximations for the Kinetics of Reactions between Neutral Species, J. Phys. Chem. B, 103, 6881-6885 (1999).
  81. K. Seki, A. V. Barzykin and M. Tachiya, Diffusion--assisted long--range reactions in confined systems. Projection operator approach. J. Chem. Phys. 110, 7639-7649 (1999).
  82. A. V. Barzykin, K. Seki and F. Shibata, Periodically driven linear system with multiplicative coloured noise. Phys. Rev. E 57, 6555-6563 (1998).
  83. K. Miyazaki and K. Seki, Brownian motion of spins revisited. J.Chem.Phys. 108, 7052-7059 (1998).
  84. K. Seki and K. Miyazaki and C. Uchiyama, "A stochastic model for dipole relaxation", Proceedings of the 2nd Tohwa University International Meeting, "Statistical Physics", eds. M. Tokuyama and I. Oppenheim, World Scientific , 191-191 (1998).
  85. K. Miyazaki and K. Seki, "Phenomenology of dielectric relaxation", Proceedings of the 2nd Tohwa University International Meeting, "Statistical Physics", eds. M. Tokuyama and I. Oppenheim, World Scientific , 189-189 (1998).
  86. A. V. Barzykin and K. Seki, Stochastic resonance driven by Gaussian multiplicative noise. Europhys. Lett. 40, 117-121 (1997).
  87. K. Seki, Reorientational dynamics of an electric dipole in fluctuating electric fields. J. Chem. Phys. 105, 4274-4283 (1996).
  88. M. Tachiya and K. Seki, Microscopic reversibility of the rate constants given by the generalized Marcus equation. Chem. Phys. Lett. 243, 330-333 (1995).
  89. K. Seki and S. Komura, Viscoelasticity of vesicle dispersions. Physica A 219, 253-289 (1995).
  90. K. Seki and K. Kitahara, Spatial correlations in reaction-diffusion systems in nonequilibrium conditions. J. Molec. Liq. 65/66, 293-296 (1995).
  91. S. Komura and K. Seki, Diffusion constant of a polymer chain in biomembranes. J. Phys. II France 5, 5-9 (1995).
  92. K. Seki, K. Kitahara and G. Nicolis, Relative spatial diffusion in turbulent media. Physica A 2093, 69-384 (1994).
  93. K. Seki and S. Komura, Brownian dynamics in a thin sheet with momentum decay. Phys. Rev. E 47, 2377-2383 (1993).
  94. K. Seki, V. Balakrishnan and G. Nicolis, Sensitivity to initial conditions in stochastic systems. Phys. Rev. E 40, 155-163 (1993).
  95. S. Komura and K. Seki, Dynamical fluctuations of spherically closed fluid membranes. Physica A 192 27-46 (1993).
  96. K. Awazu, H. Kawazoe and K. Seki, Growth mechanism of silica glasses using the liquid phase deposition(LPD). J. Non-Cryst. Solids 151, 102-108 (1992).
  97. K. Kitahara, K. Seki and S. Suzuki, On the spatial correlations in reaction-diffusion systems in nonequilibrium conditions. Proceedings of the Emil-Warburg Symposium, Dynamical processes in condensed molecular systems, eds. A. Blumen, J. Klafter and D. Haarer, World Scientific (1990).
  98. K. Kitahara, K. Seki and S. Suzuki, On the spatial correlations in nonequilibrium systems. J. Phys. Soc. Japan 59, 2309-2311 (1990).

Last Revised: Aug. 5, 2019

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