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



Profile



2007 - 2011 Ph.D. The University of Tokyo (JSPS for Young Scientist).
2011 - 2012 Poctdoctoral Fellow, The University of Tokyo.
2012 - 2014 JSPS Postdoctoral Fellow at Oak Ridge National Laboratory, USA.
2014 - Assistant Professor, The University of Tokyo.



Research



Three-dimensional Atom-by-Atom Imaging



Functional Complex Point Defect Structures







Publication list

Peer Review Papers

2017

40. 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 (2017) in press

39. 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 (2017) in press

38. 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).

37. 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).

36. 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).

35. 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).

34. 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).

33. 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).

32. 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 (2017) on line.

31. 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).

30. 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).

29. H.D. Harmish, 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).

28. 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).

2016

27. 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)

26. 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).

25. 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).

24. 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).

23. 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).

22. 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) .

2015

21 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).

20. 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).

19. 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).

18. 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).

17. 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).

2014

16. 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).

15. 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).

14. 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).

13. 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).

12. 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).

11. 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).

2013

10. 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).

9. 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).

8. 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).

7. 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).

6. 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",
Physcal Review Letters, 110, 065504 (2013).

-2012

5. 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",
Physcal Review Letters, 108, 067402 (2012).

4. 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

3. 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).

2. 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).

1. 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).

Review Articles

7. 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, (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 (2016).

5. 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).

4. 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).

3. 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).

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

1. 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

25. 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).

24. 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).

23. 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).

22. 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).

21. 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, (2016).

20. 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, (2016).

19. 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, (2016).

18. 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, (2016).

17. 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, (2016).

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

15. 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).

14. 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).

13. 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).

12. 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).

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

10. 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).

9. 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).

8. 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).

7. 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).

6. 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).

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",
Microscopy and Microanalysis, 19, Supplementary S2, 1954 (2013).

4. 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).

3. 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).

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

1. 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).

Awards

3. 2016.7. Microscopy Society of America, Albert Crewe Award
2. 2015.9.16 日本金属学会 第25回金属学会奨励賞 組織部門
1. 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