Ryo Ishikawa




BLGD.9, Yayoi 2-11-16, Bunkyo-ku, Tokyo, Japan, 113-8656
TEL: +81-3-5841-7723
Fax: +81-3-5841-7694
Mail: ishikawa@sigma.t.u-tokyo.ac.jp



Academic Career


2007 - 2011 Ph.D. The University of Tokyo (JSPS DC2).

2011 - 2012 Poctdoctoral Fellow, The University of Tokyo.

2012 - 2014 JSPS Overseas Research Fellowship at ORNL, USA.

2014 - 2020 Assistant Professor, The University of Tokyo.

2018 - 2022 (adjunct) JST-PRESTO, Intelligent Measurement Analysis.

2020 - Project Associate Professor, The University of Tokyo.



Research Topics


Three-Dimensional Atom-by-Atom Imaging by STEM Depth Sectioning

Following the establishments of aberration-correction optics in electron microscopy, the spatial resolution is extensively improved and now in the regime of deep sub-angstrom (40.5 pm, 2018). However, such high spatial resolution is only valid in the lateral two-dimensions and the remaining depth resolution along the axial direction is still no better than 5 – 10 nm in scanning transmission electron microscopy (STEM). To push the boundary of the STEM capability into three-dimensions, we are developing ‘large-angle illumination’ STEM that could improve the depth resolution.



R. Ishikawa et al, Ultramicroscopy (2015).
R. Ishikawa et al, Appl. Phys. Lett. (2016).
R. Ishikawa et al, Phys. Rev. Appl. (2020).
R. Ishikawa et al, ACS Nano (2021).

High Spatiotemporal STEM Imaging toward Atomic Dynamics

Most of research in atomic-resolution STEM imaging is focused on the static atomic structure analysis, owing to the poor temporal resolution in STEM. However, it is also important to understand dynamics at atomic dimension. To realize atomic-resolution dynamic STEM imaging, we are developing a new scanning system, where the temporal resolution should be better than TV rate (<40 ms/frame) with sub-anstrome spatial resolution.



R. Ishikawa et al, Phys. Rev. Lett. (2014).
R. Ishikawa et al, Microscopy (2020).


Selected Papers


  1. R. Ishikawa, R. Tanaka, K. Kawahara, N. Shibata, Y. Ikuhara
    "Atomic-resolution topographic imaging of crystal surfaces"
    ACS Nano (2021) on-line


  2. R. Ishikawa, S.D. Findlay, T. Seki, G. Sanchez-Santlino, Y. Kohno, Y. Ikuhara, N. Shibata
    "Direct electric field imaging of graphene defects"
    Nature Communications 9 3878 (2018)


  3. R. Ishikawa, R. Mishra, A.R. Lupini, S.D. Findlay,T. Taniguchi, S.T. Pantelides and S.J. Pennycook
    "Direct Observation of Dopant Atom Diffusion in a Bulk Semiconductor Crystal Enhanced by a Large Size Mismatch"
    Physical Review Letters 113 155501 (2014).


  4. R. Ishikawa, A.R. Lupini, S.D. Findlay, T. Taniguchi and S.J. Pennycook
    "Three-Dimensional Location of a Single Dopant with Atomic Precision by Aberration-Corrected Scanning Transmission Electron Microscopy",
    Nano Letters 14 1903-1908 (2014).


  5. R. Ishikawa, N. Shibata, F. Oba, T. Taniguchi, S.D. Findlay, I. Tanaka and Y. Ikuhara
    "Functional Complex Point-Defect Structure in a Huge-Size-Mismatch System",
    Physical Review Letters 110 065504 (2013).


  6. R. Ishikawa, E. Okunishi, H. Sawada, Y. Kondo, F. Hosokawa and E. Abe
    "Direct imaging of hydrogen-atom columns in a crystal by annular bright-field electron microscopy",
    Nature Materials 10 278 (2011).



Awards


  1. 2021 Apr.14, The Young Scientists’ Award (Ministry of Education, Japan)

  2. 2021 Feb 23, Honda Memorial Young Research Award, The Honda Memorial Fndn

  3. 2018 May 29, Encouragement Award, The Japanese Society of Microscopy

  4. 2016 Jul 25, Albert Crewe Award, Microscopy Society of America

  5. 2015 Sep 16, 25th Encouragement Award, The Japan Institute of Metals

  6. 2015 日本セラミックス協会 第40回セラミックス協会 写真賞 優秀賞



Publication list


Peer Review Papers

    2021

  1. R. Ishikawa, R. Tanaka, K. Kawahara, N. Shibata, Y. Ikuhara
    " Atomic-resolution topographic imaging of crystal surfaces"
    ACS Nano (2021) on-line


  2. B. Han, R. Zhu, X. Li, M. Wu, R. Ishikawa, B. Feng, X. Bai, Y. Ikuhara, P. Gao
    "Two-dimensional room-temperature giant antiferrodistortive SrTiO3 at a grain boundary"
    Physical Review Letters (2021) in press


  3. Q. Zheng, T. Feng, J.A. Hachtel, R. Ishikawa, Y. Cheng, L. Daemen, J. Xing, J.C. Idrobo, J. Yan, N. Shibata, Y. Ikuhara, B.C. Sales, S.T. Pantelides, M. Chi
    "Direct Visualization of Anionic Electrons in an Electride Reveals Inhomogeneities"
    Science Advances 7 eabe6819 (2021)


  4. G. Schusteritsch, R. Ishikawa, K. Inoue, K.P. McKenna, Y. Ikuhara, C.J. Pickard
    "Localized anatase grain boundary phase embedded in rutile titanium dioxide"
    Nano Letters 21 2745–2751 (2021)


  5. A. Ishizuka, K. Ishizuka, R. Ishikawa, N. Shibata, Y. Ikuhara, H. Hashiguchi, R. Sagawa
    "Improving the depth resolution of STEM-ADF sectioning by 3D deconvolution"
    Microscopy 70 241-249 (2021)


  6. R. Ishikawa, R. Tanaka, S. Morishita, Y. Kohno, H. Sawada, T. Sasaki, M. Ichikawa, M. Hasegawa, N. Shibata, Y. Ikuhara
    "Automated geometric aberration correction for large-angle illumination STEM"
    Ultramicroscopy 222 133215 (2021)


  7. J. Wei, B. Feng, R. Ishikawa, T. Yokoi, K. Matsunaga, N. Shibata, Y. Ikuhara
    "Direct imaging of atomistic grain boundary migration"
    Nature Materials (2021) on line


  8. K. Kawahara, R. Ishikawa, K. Nakayama, N. Shibata, Y. Ikuhara
    "Room temperature fluoride ion conductivity in defective β-KSb1-δF4-3δ polycrystal"
    Journal of Power Sources 483 229173 (2021)


  9. M.A. Roldan, A. Mayence, A. López-Ortega, R. Ishikawa, J. Salafranca, M. Estrader, G. Salazar-Alvarez M.D. Baró,7 J. Nogués, S.J. Pennycook, M. Varela
    "Probing the meta-stability of core|shell nanoparticle systems at atomic resolution"
    Chemical Engineering Journal 405 126820 (2021)


  10. 2020

  11. D. Kim, N. Zettsu, H. Shiiba, G. Sanchez-Santolino, R. Ishikawa, Y. Ikuhara, K. Teshima
    "Hetero-anionic surface as a new strategic approach for mitigating the side-reactions at electrolyte interface in high-voltage spinel LiNi0.5Mn1.5O4-xSx systems"
    Journal of Materials Chemistry A 8 22302-22314 (2020)


  12. K. Nakayama, R. Ishikawa, S. Kobayashi, N. Shibata, Y. Ikuhara
    "Dislocations and oxygen-release driven delithiation in Li2MnO3"
    Nature Communications 11 4452 (2020)


  13. S. Ishihara, E. Tochigi, R. Ishikawa, N. Shibata, Y. Ikuhara
    "Atomic structures of Ti-doped α-Al2O3 Σ13 grain boundary with a small amount of Si impurity"
    Journal of the American Ceramic Society 103 6659 (2020)


  14. K. Murai, K. Fujiwara, K. Nakayama, R. Ishikawa, N. Shibata, A. Tsukazaki
    "Stabilization of a honeycomb lattice of IrO6 octahedra in superlattices with ilmenite-type MnTiO3"
    Communications Materials 1 55 (2020)


  15. J. Zhu, R. Osuga, R. Ishikawa, N. Shibata, Y. Ikuhara, J.N. Kondo, M. Ogura, J. Yu, T. Wakihara, Z. Liu, T. Okubo
    "Ultrafast Encapsulation of Metal Nanoclusters into MFI Zeolite in the Course of Crystallization and Its Application for Dehydrogenation of Propane to Propene"
    Angewandte Chemie International Edition 59 19669 - 19674 (2020)


  16. G. Hasegawa, Y. Akiyama, M. Tanaka, R. Ishikawa, H. Akamatsu, Y. Ikuhara, K. Hayashi
    "Reversible Electrochemical Insertion/Extraction of Magnesium ion into/from Robust NASICON-type Crystal Lattice in a Mg(BF4)2-based Electrolyte"
    ACS Applied Energy Materials 3 6824-6833 (2020)


  17. S. Ogawa, Y. Ogino, M. Yonemura, T. Fukunaga, H. Kiuchi, K. Nakayama, R. Ishikawa, Y. Ikuhara, Y. Doi, K. Suzuki, M. Saito, T. Motohashi
    "Synthesis of Novel Melilite-type Iron/Cobalt Oxides and their Oxygen Evolution Reaction Electrocatalytic Activity"
    Chemistry of Materials 32 6847-6854 (2020)


  18. T. Futazuka, R. Ishikawa, N. Shibata, Y. Ikuhara
    "First principles calculations of group IIA and group IV impurities in α-Al2O3"
    Physical Review Materials 4 073602 (2020)


  19. S. Bhat, A. Lale, S. Bernard, W. Zhang, R. Ishikawa, S. Haseen, P. Kroll, L. Wiehl, R. Farla, T. Katsura, Y. Ikuhara, R. Riedel
    "Discovery of Ternary Silicon Titanium Nitride with Spinel-Type Structure"
    Scientific Reports 10 7372(2020)


  20. R. Ishikawa, Y. Jimbo, M. Terao, M. Nishikawa, Y. Ueno, S. Morishita, M. Mukai, N. Shibata, Y. Ikuhara
    "High spatiotemporal-resolution imaging in the scanning transmission electron microscope"
    Microscopy 69 240-247 (2020)


  21. R. Ishikawa, N. Shibata, T. Taniguchi, Y. Ikuhara
    "Three-dimensioanl imaging of a single dopant in a crystal"
    Physical Review Applied 13 034064 (2020)


  22. J. Wei, T. Ogawa, B. Feng, T. Yokoi, R. Ishikawa, A. Kuwabara, K. Matsunaga, N. Shibata, Y. Ikuhara
    "Direct measurement of electronic band structures at oxide grain boundaries"
    Nano Letters 20 2530-2536 (2020)


  23. J.T. Okada, P. Sit, R. Ishikawa, T. Ishikawa, J. Chen, Y. Yokoyama, Y. Watanabe, Y. Watanabe, P. -F. Paradis, Y. Ikuhara, K. Kimura, S. Nanao, S. Uda
    "Bulk amorphous Si produced from supercooled liquid"
    Applied Physics Letters 116 093705 (2020)


  24. S. Sasano, R. Ishikawa, K. Kawahara, T. Kimura, Y.H. Ikuhara, N. Shibata, Y. Ikuhara
    "Grain boundary Li-ion conductivity in (Li0.33La0.56)TiO3 polycrystal"
    Applied Physics Letters 116 043901 (2020)


  25. C. Zhou, A. Ott, R. Ishikawa, Y. Ikuhara, R. Riedel, E. Ionescu
    "Single-source-precursor synthesis and high-temperature evolution of novel mesoporous SiVN(O)-based ceramic nanocomposites"
    Journal of European Ceramics Society 40 6280-6287 (2020)


  26. 2019

  27. S. Ishihara, E. Tochig, R. Ishikawa, N. Shibata, Y. Ikuhara
    "Coexistence of two different atomic structures in the Σ13 pyramidal twin boundary in α-Al2O3"
    Philsophical Magazine Letters 99 435-443 (2019)


  28. K. Kawahara, R. Ishikawa, K. Nakayama, T. Higashi, T. Kimura, Y.H. Ikuhara, N. Shibata, Y. Ikuhara
    "Fast Li-ion conduction at grain boundaries in (La,Li)NbO3 polycrystal"
    Journal of Power Sources 441 227187 (2019)


  29. K. Nakayama, R. Ishikawa, A. Kuwabara, S. Kobayashi, T. Motohashi, N. Shibata, Y. Ikuhara
    "Transition Metal Distribution in Brownmillerite Ca2FeCoO5"
    Inorganic Chemistry 58 10209-10216 (2019)


  30. B. Feng, R. Ishikawa, A. Kumamoto, N. Shibata, Y. Ikuhara
    "Atomic-scale origin of enhanced ionic conductivity at crystal defects"
    Nano Letters 19 2162-2168 (2019)


  31. H.G. Brown, R. Ishikawa, G.S. Santolino, N. Shibata, Y. Ikuhara, L.J. Allen, S.D. Findlay
    "Large angle illumination enabling accurate structure reconstruction from thick samples in scanning transmission electron microscopy"
    Ultramicroscopy 197 112-121 (2019)


  32. 2018

  33. K. Kawahara, R. Ishikawa, T. Higashi, T. Kimura, Y.H. Ikuhara, N. Shibata, Y. Ikuhara
    "Unique fitting of electrochemical impedance spectra by random walk Metropolis Hastings algorithm"
    Journal of Power Sources 403 184-191 (2018)


  34. R. Ishikawa, S.D. Findlay, T. Seki, G. Sanchez-Santlino, Y. Kohno, Y. Ikuhara, N. Shibata
    "Direct electric field imaging of graphene defects"
    Nature Communications 9 3878 (2018)


  35. Z. Wang, Y. Inoue, T. Hisatomi, R. Ishikawa, Q. Wang, D. Murthy, Y. Suzuki, T. Takata, S. Chen, N. Shibata, H. Matsuzaki, K. Seki, A. Furube, Y. Ikuhara, K. Domen
    "Overall water splitting by Ta3N5 nanorod single crystals grown on the edges of KTaO3 particles"
    Nature Catalysis 1 756-763 (2018)


  36. G. Sanchez-Santolino, N.R. Lugg, T. Seki, R. Ishikawa, S.D. Findlay, Y. Kohno, Y. Kanitani, S. Tanaka, S. Tomiya, Y. Ikuhara, N. Shibata
    "Probing the Internal Atomic Charge Density Distributions in Real Space"
    ACS Nano 12 8875-8881 (2018)


  37. P. Gao, S. Yang, R. Ishikawa, N. Li, B. Feng, A. Kumamoto, N. Shibata, P. Yu, Y. Ikuhara
    "Atomic-Scale Measurement of Flexoelectric Polarization at SrTiO3 Dislocations"
    Physical Review Letters 120 267601 (2018)


  38. K. Szot, C. Rodenbücher, G. Bihlmayer, W. Speier, R. Ishikawa, N. Shibata, Y. Ikuhara
    "Influence of dislocations in transition metal oxides on selected physical and chemical properties"
    Crystals 8 241-317 (2018)


  39. S. Morishita, R. Ishikawa, Y. Kohno, H. Sawada, N. Shibata, Y. Ikuhara
    "Attainment of 40.5 pm spatial resolution using 300 kV scanning transmission electron microscope equipped with fifth-order aberration corrector"
    Microscopy 67 46-50 (2018)


  40. P. Gao, R. Ishikawa, B. Feng, A. Kumamoto, N. Shibata, Y. Ikuhara
    "Atomic-Scale Structure Relaxation, Chemistry and Charge Distribution of Dislocation Cores in SrTiO3"
    Ultramicroscopy 184 217-224 (2018)


  41. P. Gao, A. Kumamoto, R. Ishikawa, N. Lugg, N. Shibata, Y. Ikuhara
    "Picometer-scale atom position analysis in annular bright-field STEM imaging"
    Ultramicroscopy 184 177-187 (2018)


  42. 2017

  43. R. Mishra, R. Ishikawa, A.R. Lupini, S.J. Pennycook
    "Single Atom Dynamics in Scanning Transmission Electron Microscopy"
    MRS Bulletin 42 644-652 (2017)


  44. T. Seki, G.S. Santolino, R. Ishikawa, S.D. Findlay, Y. Ikuhara, N. Shibata
    "Quantitative electric field mapping in thin specimens using a segmented detector: revisiting the transfer function for differential phase contrast"
    Ultramicroscopy 182 258-263 (2017).


  45. X Liu, Z. Yu, R. Ishikawa, L. Chen, X. Yin, Y. Ikuhara, R. Riedel
    "Single-source-precursor synthesis and excellent electromagnetic properties of novel RGO-SiCN ceramic nanocomposites"
    Journal of Materials Chemistry C 5 7950-7960 (2017)


  46. R. Ishikawa, Y. Shimbo, I. Sugiyama, N.R. Lugg, N. Shibata, Y. Ikuhara
    "Room Temperature Dilute Ferromagnetic Dislocations in (Sr1-xMnx)TiO3-δ"
    Physical Review B 96 024440 (2017).


  47. D. Kim, H. Shiiba, N. Zettsu, T. Yamada, T. Kimijima, G.S. Santolino, R. Ishikawa, Y. Ikuhara, K. Teshima
    "Full Picture Discovery for Mixed-Fluorine Anion Effects on High-Voltage Spinel Manganese Cathodes"
    NPG Asia Materials 9 e398 (2017).


  48. P. Gao, Z. Zhang, M. Li, R. Ishikawa, B. Feng, H.-J, Liu, Y.-L. Huang, N. Shibata, X. Ma, S. Chen, J. Zhang, K. Liu, E.-G. Wang, D. Yu, L. Liao, Y. -H. Chu, Y. Ikuhara
    "Possible Absence of Critical Thickness and Size Effect in Ultrathin Perovskite Ferroelectric Films"
    Nature Communications 8 15549 (2017).


  49. S. Sasano, R. Ishikawa, T. Higashi, T. Kimura, Y.-H. Ikuhara, N. Shibata, Y. Ikuhara
    "Relative Li-ion mobility mapping in Li0.33La0.56TiO3 polycrystalline by electron backscatter diffraction and electrochemical strain microscopy"
    Applied Physics Express 10 061102 (2017).


  50. N. Shibata, T. Seki, G.S. Santolino, S.D. Findlay, Y. Kohno, T. Matsumoto, R. Ishikawa, Y. Ikuhara, "Electric field imaging of single atoms"
    Nature Communications 8 15631 (2017).


  51. X Liu, Z. Yu, R. Ishikawa, L. Chen, X. Yin, Y. Ikuhara, R. Riedel "Single-source-precursor derived RGO/CNTs-SiCN ceramic nanocomposite with ultra-high electromagnetic shielding effectiveness"
    Acta Materialia 170 83-93 (2017).


  52. C. Zhou, C. Fasel, R. Ishikawa, M. Gallei, Y. Ikuhara, H-J. Kleebe, R. Riedel, E. Ionescue "One-pot synthesis of a C/SiFeN(O)-based ceramic paper with in-situ generated hierarchical micro/nano-morphology"
    Journal of European Ceramic Society 37 5193-5203 (2017)


  53. N. Nishiyama, R. Ishikawa, H. Ohfuji, H. Marquardt, A. Kurnosov, T. Taniguchi, B. Kim, H. Yoshida, A. Masuno, J. Bednarcik, E. Kulik, Y. Ikuhara, F. Wakai, and T. Irifune, "Transparent polycrystalline cubic silicon nitride"
    Scientific Reports 7 44755 (2017).


  54. P. Gao, R. Ishikawa, E. Tochigi, A. Kumamoto, N. Shibata, and Y. Ikuhara
    "Atomic-Scale Tracking a Phase Transition from Spinel to Rocksalt in Lithium Manganese Oxide"
    Chemistry of Materials 29 1006-1013 (2017).


  55. H.G. Brown, R. Ishikawa, G.S. Santolino, N. Lugg, Y. Ikuhara, L.J. Allen, N. Shibata
    "A new method to detect and correct sample tilt in scanning transmission electron microscopy bright-field imaging"
    Ultramicroscopy 173 76-83 (2017).


  56. S.D. Findlay, R. Huang, R. Ishikawa, N. Shibata and Y. Ikuhara
    "Direct visualization of lithium via annular bright field scanning transmission electron microscopy: a review"
    Microscopy 66 3-14 (2017).


  57. 2016

  58. S.J Pennycook, G. Duscher, R. Buczko, M. Kim, N.D. Browning, W. Zhou, C. Li, T.J. Pennycook, R. Ishikawa, S.T. Pantelides
    "Atomic Structure and Properties of Dislocations and Grain Boundaries"
    Reference Module in Materials Science and Materials Engineering (2016).


  59. Y. Imanaka, T. Anazawa, T. Manabe, H. Amada, S. Ido, F. Kumasaka, N. Awaji, G.S. Santolino, R. Ishikawa and Y. Ikuhara, "An artificial photosynthesis anode electrode composed of a nanoparticulate photocatalyst film in a visible light responsive GaN-ZnO solid solution system"
    Scientific Reports 6 35593 (2016)


  60. R. Ishikawa, S.J. Pennycook, A.R. Lupini, S.D. Findlay, N. Shibata and Y. Ikuhara
    "Single Atom Visibility by STEM Optical Depth Sectioning"
    Applied Physics Letters 109 163102 (2016).


  61. T. Matsumoto, Y.G. So, Y. Kohno, H. Sawada, R. Ishikawa, N. Shibata and Y. Ikuhara
    "Jointed magnetic skyrmion lattices at a small-angle grain boundary directly visualized by advanced electron microscopy"
    Scientific Reports 6 35880 (2016).


  62. K. Matsunaga, TY. Chang, R. Ishikawa, Q. Dong, K. Toyoura, A. Nakamura, Y. Ikuhara and N. Shibata
    "Adsorption sites of single noble metal atoms on the rutile TiO2 (110) surface influenced by different surface oxygen vacancies"
    Journal of Physics: Condenced Matter 28 175002 (2016).


  63. P. Gao, HJ. Liu, YL. Huang, YH. Chu, R. Ishikawa, B. Feng, Y. Jiang, N. Shibata, E. Wang, and Y. Ikuhara
    "Atomic Mechanism of Polarization-Controlled Surface Reconstruction in Ferroelectric Thin Films"
    Nature Communications 7 11318 (2016).


  64. R. Ishikawa, Nathan R. Lugg, K. Inoue, H. Sawada, T. Taniguchi, N. Shibata, and Y. Ikuhara
    "Interfacial Atomic Structure of Twisted Few-Layer Graphene"
    Scientific Reports 6 21273 (2016) .


  65. 2015

  66. A.R. Lupini, S.N. Rashkeev, M. Varela, A.Y. Borisevich, M.P. Oxley, K. van Benthem, Y. Peng, N. De Jonge, G.M. Beith, T.J. Pennycook, W. Zhou, R. Ishikawa, M.F. Chisholm, S.T. Pantelides, S.J Pennycook
    "Scanning Transmission Electron Microscopy"
    Nanocharacterisation (Chapter 2) 2nd Edit. 30-79, The Royal Society of Chemistry (2015).


  67. Q. He, R. Ishikawa, A. R. Lupini, L. Qiao, E.J. Moon, O. Ovchinnikov, S.J. May, M. D. Biegalski, and A. Borisevich
    "Towards 3D Mapping of BO6 Octahedron Rotations at Perovskite Thin Film Heterointerfaces, Unit Cell by Unit Cell"
    ACS Nano 8 8412-8419 (2015).


  68. J.T. Okada, P.H.-L. Sit, Y. Watanabe, B. Barbiellini, T. Ishikawa, Y.J. Wang, M. Itou, Y. Sakurai, A. Bansil, R. Ishikawa, M. Hamaishi, P.-F. Paradis, K. Kimura, T. Ishikawa, and S. Nanao
    "Visualizing the mixed bonding properties of liquid boron with high resolution Compton scattering",
    Physical Review Letters 114 177401 (2015).


  69. G. Mera, R. Ishikawa, E. Ionescu, Y. Ikuhara and R. Riedel
    "Atomic-Scale Assessment of the Crystallization Onset in Silicon Carbonitride"
    Journal of European Ceramic Society 35 3355 (2015).


  70. R. Ishikawa, A.R. Lupini, Y. Hinuma and S.J. Pennycook
    "Large-angle illumination STEM: Toward three-dimensional atom-by-atom imaging"
    Ultramicroscopy 151 122-129 (2015).


  71. 2014

  72. R. Ishikawa, R. Mishra, A.R. Lupini, S.D. Findlay,T. Taniguchi, S.T. Pantelides and S.J. Pennycook
    "Direct Observation of Dopant Atom Diffusion in a Bulk Semiconductor Crystal Enhanced by a Large Size Mismatch"
    Physical Review Letters 113 155501 (2014).


  73. C. Ma, K. Chen, C. Liang, C.-W. Nan, R. Ishikawa, K. More and M. Chi
    "Atomic-scale origin of the large grain-boundary resistance in perovskite Li-ion-conducting solid electrolytes"
    Energy & Environmental Science 7 1638-1642 (2014).


  74. R. Ishikawa, A.R. Lupini, S.D. Findlay, T. Taniguchi and S.J. Pennycook
    "Three-Dimensional Location of a Single Dopant with Atomic Precision by Aberration-Corrected Scanning Transmission Electron Microscopy",
    Nano Letters 14 1903-1908 (2014).


  75. M. Matsukawa, R. Ishikawa, T. Hisatomi, Y. Moriya, N. Shibata, J. Kubota, Y. Ikuhara and K. Domen
    "Enhancing Photocatalytic Activity of LaTiO2N by Removal of Surface Reconstruction Layer",
    Nano Letters 14 1038 (2014).


  76. R. Ishikawa, A.R. Lupini, F. Oba, S.D. Findlay, N. Shibata, T. Taniguchi, K. Watanabe, H. Hayashi, T. Sakai, I. Tanaka, Y. Ikuhara and S.J. Pennycook
    "Atomic Structure of Luminescent Centers in High-Efficiency Ce-doped w-AlN Single Crystal",
    Scientific Reports 4 3778 (2014).


  77. R. Ishikawa, A.R. Lupini, S.D. Findlay and S.J. Pennycook
    "Quantitative Annular Dark Field Electron Microscopy Using Single Electron Signals",
    Microscopy and Microanalysis 20 99-110 (2014).


  78. 2013

  79. C. Teng-Yuan, Y. Tanaka, R. Ishikawa, K. Toyoura, K. Matsunaga, Y. Ikuhara and N. Shibata
    "Direct imaging of Pt single atoms adsorbed on TiO2 (110) surfaces",
    Nano Letters 14 134 (2013).


  80. T. Matsumoto, R. Ishikawa, T. Tohei, H. Kimura, Q. Yao, H. Zhao, X. Wang, D. Chen, Z. Cheng, N. Shibata and Y. Ikuhara
    "Multivariate Statistical Characterization of Charged and Uncharged Domain Walls in Multiferroic Hexagonal YMnO3 Single Crystal Visualized by a Spherical Aberration-Corrected STEM",
    Nano Letters 13 4594 (2013).


  81. H. Yu, R. Ishikawa, Y.-G. So, N. Shibata, T. Kudo, H. Zhou and Y. Ikuhara
    "Direct Atomic-Resolution Observation of Two Phases in the Li1.2Mn0.567Ni0.166Co0.067O2 Cathode Material for Lithium-Ion Batteries",
    Angewandte Chemie International Edition 52 5969 (2013).


  82. Y. Ogasawara, S. Uchida, T. Maruichi, R. Ishikawa, N. Shibata, Y. Ikuhara and N. Mizuno
    "Cubic Cesium Hydrogen Silicododecatungstate with Anisotropic Morphology and Polyoxometalate Vacancies Exhibiting Selective Water Sorption and Cation-Exchange Properties",
    Chemistry of Materials 25 905 (2013).


  83. R. Ishikawa, N. Shibata, F. Oba, T. Taniguchi, S.D. Findlay, I. Tanaka and Y. Ikuhara
    "Functional Complex Point-Defect Structure in a Huge-Size-Mismatch System",
    Physical Review Letters 110 065504 (2013).


  84. -2012

  85. J.T. Okada, P.H.-L. Sit, Y. Watanabe, Y.J. Wang, B. Barbiellini, T. Ishikawa, M. Itou, Y. Sakurai, A. Bansil, R. Ishikawa, M. Hamaishi, T. Masaki, P.-F. Paradis, K. Kimura, T. Ishikawa and S. Nanao,
    "Persistence of Covalent Bonding in Liquid Silicon Probed by Inelastic X-Ray Scattering",
    Physical Review Letters 108 067402 (2012).


  86. R. Ishikawa, E. Okunishi, H. Sawada, Y. Kondo, F. Hosokawa and E. Abe
    "Direct imaging of hydrogen-atom columns in a crystal by annular bright-field electron microscopy",
    Nature Materials 10 278 (2011).
    Electron microscopy: Hydrogen brightens up


  87. R. Ishikawa and E. Abe
    "Stacking Faults and a Novel Structural Polytype in a Hydrogen-Storage (La0.8Mg0.2)Ni3.5 Alloy with Block-Stacking Superstructures",
    Materials Transactions 50 943 (2009).


  88. R. Ishikawa, T. Ishikawa, J.T. Okada, T. Maski, Y. Watanabe and S. Nanao
    "Thermophysical properties of the melts of AlPdMn icosahedral quasicrystal",
    Philosophical Magazine 87 2965 (2007).


  89. J.T. Okada, Y. Sakurai, Y. Watanabe, R. Ishikawa, Y. Yokoyama, N. Hiraoka, M. Itou and S. Nanao
    "A Compton scattering study on the Hume-Rothery mechanism of AlCu-TM (TM: transition metal) quasicrystals",
    Journal of Physics: Condensed Matter 18 7203 (2006).



Invited Talks at International Conferences

  1. R. Ishikawa, "Three-dimensional imaging by STEM depth sectioning", PICO 2021, May 4, 2021, on-line


  2. R. Ishikawa, "Recent Progresses on atomic-resolution electron microscopy", Seminars at Monash Centre for Electron Microscopy, Aug. 11, 2020, on-line webinar.


  3. R. Ishikawa et al, "Complex atomic structure and three-dimensional single dopant distribution in Ce-doped cubic boron nitride", Materials Research Meeting 2019, Dec. 11, 2019, Yokohama, Japan.


  4. R. Ishikawa et al, "Advanced point defect analysis by atomic-resolution STEM", 10th PRICM, Aug. 22, 2019, Xian, China.


  5. R. Ishikawa et al, "Atomic-resolution dynamic STEM observations for single atom tracking", 19th International Microscopy Congress, Sep 13, 2018, Sydney, Australia.


  6. R. Ishikawa et al, "Advanced Electron Microscopy for nitride", 9th International Workshop on Spinel Nitrides and Related Materials, Sep 5, 2018, Rudesheim, Germany


  7. R. Ishikawa et al, "Surface and Electric Field Imaging by Newly Designed Atomic-Resolution STEM", Microscopy & Microanalysis 2018, Aug 8, 2018, Baltimore, USA.


  8. R. Ishikawa et al, "Tracking of single atom diffusion in bulk materials", International Workshop on STEM, May 11, 2018, Beijin, China.


  9. R. Ishikawa et al, "Dynamic observation of single atom diffusion and phase transition", MRS 2018 Spring Meeting & Exhibit, Apr 4, 2018, AZ, USA.


  10. R. Ishikawa et al, "Atomic structures of dislocation and surface in oxide materials", The 3rd East-Asia Microscopy Conference, Nov 8 2017 , Busan, South Korea.


  11. R. Ishikawa et al, "The local structure and chemistry in solid state electrolytes", The 15th International Conference on Advanced Materials, Aug 2017, Kyoto University, Japan


  12. R. Ishikawa, "Direct Observation of Functional Point Defect Structures in Nitrides", 8th International Workshop on Spinel Nitrides and Related Materials, Sep 2016, Rudesheim, Germany


  13. R. Ishikawa, "Quantitative Electron Microscopy and the Application by Single Electron Signals", Microscopy & Microanalysis 2015, Aug 2015, Portland, USA.


  14. R. Ishikawa, "Advanced Electron Microscopy for Energy Related Materials", Microscopy & Microanalysis 2015, Aug 2015, Portland, USA.


Invited Talks and seminors at Domestic Conferences

  1. 石川亮, " ", Sep. 3, 2020, 日本セラミックス協会, オンライン会議


  2. 石川亮, "原子分解能電子顕微鏡によるセラミックス材料の構造解析",2019 年度 エンジニアリングセラミックス若手セミナー, Aug. 28, 2019, ハートピア熱海


  3. 石川亮, "先端電子顕微鏡法による局所構造解析",第2回計測インフォマティクス研究会,Mar. 6, 2019, 物質・材料開発機構,筑波 


  4. 石川亮, "電気化学歪顕微鏡法と原子分解能STEMによる固体電解質材料の解析",アサイラムAFMセミナー, Nov. 20, 2018, 日本橋,東京


  5. 石川亮, "原子分解能STEMを用いた点欠陥構造の研究", 第74回日本顕微鏡学会, May 29 2018, 久留米


  6. 石川亮, "原子分解能STEM法を用いた点欠陥構造解析の新展開", 第12回日本フラックス成長研究発表会, Dec 8 2017, 横浜


  7. 石川亮, "原子分解能顕微鏡法を用いたセラミックス材料解析", 第153回124委員会, Sep 1 2017, 東工大


  8. 石川亮, "先進電子顕微鏡法を用いた点欠陥構造解析", Workshop on materials science under ultra-high pressure matsuyama 2017, Mar. 2 2017, 愛媛


  9. 石川亮, "ADF-STEM法による単原子ドーパントの解析", ニューダイヤモンドフォーラム 平成23年度 第二回研究会, Jun 22 2016, 東工大


  10. 石川亮, "STEM像の定量解析手法の開発とその応用", 日本金属学会, Sep 13 2015, 九大


  11. 石川亮, "電子計数法に基づくSTEM像の定量解析とその応用", 超高分解能研究会, Feb 21 2014, 三浦海岸


Review Articles & Book Chapters

  1. 石川亮, 柴田直哉, 堂免一成, 幾原雄一 "光触媒材料の表面原子構造解析",
    『触媒(Catalysts and Catalysis)』、62[1], 2-8(2020).


  2. 石川亮, 柴田直哉,幾原雄一 "グラフェン欠陥の原子電場構造解析",
    日本結晶学会誌, 61, 231 (2019).


  3. 石川亮, 田中利空, 柴田直哉, 幾原雄一 "DigitalMicrographによる電子顕微鏡の簡単な制御および画像解析"
    , まてりあ,57[12], 584-588(2018).


  4. 石川亮, 幾原雄一 "走査透過型電子顕微鏡によるリチウムイオン電池材料の局所構造解析",
    リチウムイオン電池における高容量化・高電圧化技術と安全対策, 技術情報協会 (2018).


  5. 関岳人, Sánchez-Santolino Gabriel, 石川亮, 幾原雄一, 柴田直哉 "原子分解能微分位相コントラストSTEM法の理論",
    顕微鏡, 52[1], 8-12 (2017).


  6. 石川亮, "立方晶窒化ホウ素中に形成された複合点欠陥",
    まてりあ, 55[12], 609- (2016).


  7. 石川亮, "走査透過型電子顕微鏡による定量解析とその応用",
    まてりあ 55 479-483 (2016).


  8. 石川亮, 柴田直哉, 大場史康, S.D. Findlay, 谷口尚, 田中功, 幾原雄一, "希土類添加cBN結晶中に形成された複合点欠陥の局所構造解析",
    ニューダイヤモンド, 112, 1 (2014).


  9. 阿部 英司, 石川 亮, "相反定理に基づく環状明視野STEM結像の考察",
    顕微鏡, 47, 211 (2012).


  10. E. Abe, D. Egusa, R. Ishikawa and T. Seki, "Ultrahigh-Resolution STEM Analysis of Complex Compounds",
    JEOL News, 45, 20 (2010).


  11. 石川 亮, 阿部 英司, "水素吸蔵-放出した(La0.6Y0.4)5Ni19ブロック積層型化合物の微細構造",
    まてりあ, 48 597(2009).



Conference Proceedings

  1. R. Ishikawa, N. Shibata, Y. Ikuhara, "Surface and Electric Field Imaging by Newly Designed Atomic-Resolution STEM",
    Microscopy and Microanalysis, 24, 118 Suppl. S1 (2018).


  2. S. Morishita, R. Ishikawa, Y. Kohno, H. Sawada, N. Shibata, Y. Ikuhara, "Resolution Achievement of 40.5 pm in Scanning Transmission Electron Microscopy using 300 kV Microscope with Delta Corrector",
    Microscopy and Microanalysis, 24, 120 Suppl. S1 (2018).


  3. P. Gao, R. Ishikawa, F. Bin, N. Shibata, Y. Ikuhara, "Better Contrast for Imaging Defects by ABF",
    Microscopy and Microanalysis, 23, 480 Suppl. S3 (2017).


  4. T. Seki, G. Sanchez-Santolino, R. Ishikawa, Y. Ikuhara, N. Shibata, "Quantitative Relation Between Differential Phase Contrast Images Obtained by Segmented and Pixelated DetectorsF",
    Microscopy and Microanalysis, 23, 440 Suppl. S1 (2017).


  5. R. Ishikawa, S.J. Pennycook, A.R. Lupini, S.D. Findlay, N. Shibata, Y. Ikuhara, "Three-Dimensional Point Defect Imaging by Large-angle Illumination STEM",
    Microscopy and Microanalysis, 23, 424 Suppl. S1 (2017).


  6. N. Shibata, S.D. Findlay, T. Matsumoto, T. Seki, G. Sanchez-Santolino, Y. Kohno, H. Sawada, H. Sasaki, Y.G. So, R. Ishikawa, Y. Ikuhara, "Direct Electromagnetic Structure Observation by Aberration-corrected Differential Phase Contrast Scanning Transmission Electron Microscopy",
    Microscopy and Microanalysis, 22, 906 Suppl. S3 (2016).


  7. G. Sanchez-Santolino, T. Seki, N.R. Lugg, R. Ishikawa, D.J. Taplin, S.D. Findlay, Y. Ikuhara, N. Shibata, "Quantitative Atomic Resolution Differential Phase Contrast Imaging Using a Segmented Area All Field Detector",
    Microscopy and Microanalysis, 22, 504 Suppl. S3 (2016).


  8. N.R. Lugg, A. Kumamoto, R. Ishikawa, G. Kothleitner, N. Shibata, Y. Ikuhara, "Atomic-Resolution Composition Mapping in EDS STEM",
    Microscopy and Microanalysis, 22, 1432 Suppl. S3 (2016).


  9. P. Gao, A. Kumamoto, R. Ishikawa, N.R. Lugg, N. Shibata, Y. Ikuhara, "Misalignment Induced Artifacts in Quantitative Annular Bright-Field Imaging",
    Microscopy and Microanalysis, 22, 888 Suppl. S3 (2016).


  10. G. Sanchez-Santolino, T. Seki, N.R. Lugg, R. Ishikawa, D.J. Taplin, S.D. Findlay, Y. Ikuhara, N. Shibata "Characterization of Electromagnetic Fields by Atomic Resolution Differential Phase Contrast Scanning Transmission Electron Microscopy",
    AMTC Letters, 5, 242-(2016).


  11. S. Sasano, Y. Shimbo, R. Ishikawa, T. Kimura, Y. H. Ikuhara, N. Shibata, Y. Ikuhara, "Local Li-ion Mobility of Polycrystalline Oxide Electrolyte",
    AMTC Letters, 5, 176-(2016).


  12. N. R. Lugg, A. Kumamoto, R. Ishikawa, B. Feng, G. Kothleitner, N. Shibata, Y. Ikuhara, "Composition Mapping in Atomic-Resolution EDS STEM",
    AMTC Letters, 5, 128-129(2016).


  13. D. J. Taplin, R. Ishikawa, T. Seki, H. Sawada, M. Weyland, N. Shibata, S. D. Findlay, "Differential Phase Contrast Imaging using a Segmented Detector",
    AMTC Letters, 5, 24-25(2016).


  14. T. Higashi, R. Ishikawa, T. Kimura, Y. -H. Ikuhara, N. Shibata, Y. Ikuhara, "Grain boundary atomic structures in solid-state electrolyte Li0.28La0.53TiO3",
    AMTC Letters, 5, 20-21(2016).


  15. R. Ishikawa, N. R. Lugg, K. Inoue, H. Sawada, T. Taniguchi, N. Shibata, Y. Ikuhara, "Interfacial Atomic Structure of Twisted Graphene",
    AMTC Letters, 5, 22-23(2016).


  16. Y. Ikuhara, R. Ishikawa, T. Nakagawa, E. Tochigi, T. Tohei, and N. Shibata, "Atomic-Scale STEM Characterization of Grain Boundaries in Oxides",
    Microscopy, 64, i10 (2015).


  17. P. Gao, R. Ishikawa, E. Tochigi, A. Kumamoto, N. Shibata, and Y. Ikuhara, "Atomic-scale Tracking Cation Diffusion in Lithium Manganese Oxide",
    Microscopy, 64, i15 (2015).


  18. P. Gao, R. Ishikawa, E. Tochigi, A. Kumamoto, N. Shibata, and Y. Ikuhara, "Atomic Observation of Phase Transformation from Spinel to Tock Salt in Lithium Manganese Oxide",
    Microscopy and Microanalysis, 21, 333 Suppl. S3 (2015).


  19. P. Gao, R. Ishikawa, E. Tochigi, A. Kumamoto, N. Shibata, and Y. Ikuhara, "Annular Bright-Field Electron Microscopy Tracking Solid-State Chemical Reaction",
    Microscopy and Microanalysis, 21, 963 Suppl. S3 (2015).


  20. R. Ishikawa, N. Shibata and Y. Ikuhara, "Advanced Electron Microscopy for Energy Related Materials",
    Microscopy and Microanalysis, 21, 471 Suppl. S3 (2015).


  21. R. Ishikawa, A.R. Lupini, S.D. Findlay, T. Taniguchi, and S.J. Pennycook, "Quantitative Electron Microscopy and the Application by Single Electron Signals",
    Microscopy and Microanalysis, 21, 1449 Suppl. S3 (2015).


  22. M.A. Roldan, J. Salafranca, R. Ishikawa, R. Mishra, A. López-Ortega, M. Estrader, J. Nogues, S.J. Pennycook and M. Varela, "Atomic-Resolution Monitoring of Structural Phase Transition in Bi-magnetic Core/Shell Oxide Nanoparticles",
    Microscopy and Microanalysis, 20, Suppl. S3 (2014).


  23. Q. He, R. Ishikawa, A.R. Lupini, Q. Liang, M.D. Biegalski, A. Borisevich, "Toward 3D mapping of octahedral rotations at perovskite thin film heterointerfaces unit cell by unit cell",
    Microscopy and Microanalysis, 20, Suppl. S3 (2014).


  24. S.J. Pennycook, R. Ishikawa, A.R. Lupini, S.D. Findlay, R. Mishra and S.T. Pantelides, "Tracking Dopant Diffusion Pathways inside Bulk Materials",
    Microscopy and Microanalysis, 20, 1038 Suppl. S3 (2014).


  25. R. Ishikawa, N. Shibata, F. Oba, S.D. Findlay, T. Taniguchi, A.R. Lupini, S.J. Pennycook, I. Tanaka and Y. Ikuhara, "Atomic structures of luminescent centers in size-mismatch systems",
    AMTC Letters 4, (2014).


  26. R. Ishikawa, N. Shibata, F. Oba, T. Taniguchi, S.D. Findlay, I. Tanaka and Y. Ikuhara, "Functional Complex Point-Defect Structure in a Huge-Size-Mismatch System",
    Microscopy and Microanalysis, 19, Supplementary S2, 1954 (2013).


  27. R. Ishikawa, N. Shibata, F. Oba, T. Taniguchi, S.D. Findlay, I. Tanaka and Y. Ikuhara, "Atomic-resolution STEM Imaging in Nitrides",
    AMTC Letters 3, 84 (2012).


  28. R. Ishikawa and E. Abe, "Direct Imaging of Interstitial Atoms in (La0.6Er0.4)5Ni19 Hydrogen Storage Compound",
    Microscopy and Microanalysis, 17, Supplementary S2, 1612 (2011).


  29. R. Ishikawa and E. Abe, "Direct Imaging of Interstitials in (La0.6Er0.4)5Ni19 Complex Compound",
    AMTC Letters, 2, 218 (2010).


  30. R. Ishikawa, E. Abe, K. Ishikawa and K. Aoki, "Novel long period structures in hydrogen storage LaxY1-xNi3.8 compounds",
    Acta Crystallography, A64, C533 (2008).