Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Yoshifumi Ikoma Last modified date:2019.09.20

Assistant Professor / Advanced Materials Physics / Department of Materials Science and Engineering / Faculty of Engineering


Papers
1. Jacqueline Hidalgo-Jimenez,Qing Wang,Kaveh Edalati,Jorge M. Cubero-Sesín,Hadi Razavi-Khosroshahi,Yoshifumi Ikoma,Dionisio Gutiérrez-Fallas,Fernando A. Dittel-Meza,Juan Carlos Rodríguez-Rufino,Masayoshi Fuji, Zenji Horita, Phase transformations, vacancy formation and variations of optical and photocatalytic properties in TiO2-ZnO composites by high-pressure torsion, International Journal of Plasticity, 10.1016/j.ijplas.2019.08.010, in press..
2. Yoshifumi Ikoma, Severe Plastic Deformation of Semiconductor Materials Using High-Pressure Torsion, Materials Transactions, 10.2320/matertrans.MF201907, 60, 7, 1168-1176, 2019.07.
3. Bumsoo Chon, Yoshifumi Ikoma, Masamichi Kohno, Junichiro Shiomi, Martha R. McCartney, David J. Smith, Zenji Horita, Impact of metastable phases on electrical properties of Si with different doping concentrations after processing by high-pressure torsion, Scripta Materialia, 10.1016/j.scriptamat.2018.08.011, 157, 120-123, 2018.12.
4. Yoshifumi Ikoma, Bumsoo Chon, Terumasa Yamasaki, Kazutoshi Takahashi, Katsuhiko Saito, Qixin Guo, and Zenji Horita, Crystal and electronic structural changes during annealing in severely deformed Si containing metastable phases formed by high-pressure torsion, Applied Physics Letters, 10.1063/1.5038160, 113, 101904, 2018.09.
5. Kazuki Kumano, Yoshifumi Ikoma, Kaveh Edalati, Katsuhiko Saito, Qixin Guo, Zenji Horita, Thermal effects on the formation of Si and Ge metastable phases during HPT processing, Proceedings of the International Workshop on Giant Straining Process for Advanced Materials (GSAM2017), 19-20, 2017.10.
6. Yoshifumi Ikoma, Kazuki Kumano, Kaveh Edalati, Martha R. McCartney, David J. Smith, Zenji Horita, TEM observations of Ge processed by high-pressure torsion, Proceedings of the International Workshop on Giant Straining Process for Advanced Materials (GSAM2017), 17-18, 2017.10.
7. Hadi Razavi-Khosroshahi, Kaveh Edalati, Ji Wu, Yuki Nakashima, Makoto Arita, Yoshifumi Ikoma, Masaaki Sadakiyo, Yuji Inagaki, Aleksandar Staykov, Miho Yamauchi, Zenji Horita, Masayoshi Fuji, High-pressure zinc oxide phase as visible-light-active photocatalyst with narrow band gap, Journal of Materials Chemistry A, 10.1039/C7TA05262F, 5, 20298-20303, 2017.10.
8. Yoshifumi Ikoma, Kazuki Kumano, Kaveh Edalati, Martha R. McCartney, David J. Smith, Zenji Horita, High-resolution transmission electron microscopy analysis of nanograined germanium produced by high-pressure torsion, Materials Characterization, 10.1016/j.matchar.2017.08.011, 132, 132-138, 2017.10.
9. Yuta Fukushima, Yoshifumi Ikoma, Kaveh Edalati, Bumsoo Chon, David J. Smith, Zenji Horita, High-resolution transmission electron microscopy analysis of bulk nanograined silicon processed by high-pressure torsion, Materials Characterization, 10.1016/j.matchar.2017.04.025, 129, 163-168, 2017.07.
10. Yoshifumi Ikoma, Kazuki Kumano, Kaveh Edalati, Katsuhiko Saito, Qixin Guo, Zenji Horita, Phase transformation of germanium by processing through high-pressure torsion: strain and temperature effects, Philosophical Magazine Letters, 10.1080/09500839.2016.1266099, 97, 1, 27-34, 2017.01.
11. Masaki Mito, Hideaki Matsui, Kazuki Tsuruta, Tomiko Yamaguchi, Kazuma Nakamura, Hiroyuki Deguchi, Naoki Shirakawa, Hiroki Adachi, Tohru Yamasaki, Hideaki Iwaoka, Yoshifumi Ikoma, Zenji Horita, Large enhancement of superconducting transition temperature in single-element superconducting rhenium by shear strain, Scientific Reports, 10.1038/srep36337, 6, 36337 (8 pages), 2016.11.
12. Yoshifumi Ikoma, HPT processing of germanium at cryogenic temperature, Proceedings of the International Workshop on Giant Straining Process for Advanced Materials (GSAM2016), 66-67, 2016.10.
13. Bumsoo Chon, Yoshifumi Ikoma, Masamichi Kohno, Junichiro Shiomi, Zenji Horita, Investigation of electrical resistivities of nanograined Si produced by high-pressure torsion , Proceedings of the International Workshop on Giant Straining Process for Advanced Materials (GSAM2016), 53-54, 2016.10.
14. Tingting Miao, Weigang Ma, Shen Yan, Xing Zhang, Masamichi Kohno, Yasuyuki Takata, Yoshifumi Ikoma, Thermal transport and thermal stress in a molybdenum film–glass substrate system, J. Vac. Sci. Technol. B, 34, 2, 021801-1-021801-6, 2016.03.
15. Yuta Fukushima, Kaveh Edalati, Yoshifumi Ikoma, David J. Smith, Zenji Horita, Observation of nanocrystalline silicon processed by high-pressure torsion (HPT), Proceedings of the International Workshop on Giant Straining Process for Advanced Materials (GSAM2015), 37-39, 2016.01.
16. Masamichi Kohno, Sivasankaran Harish, Mitsuru Tabara, Yoshifumi Ikoma, Zenji Horita, Yasuyuki Takata, David G. Cahill, Reduction in thermal conductivity of bulk silicon processed by high-pressure torsion
, Proceedings of the International Workshop on Giant Straining Process for Advanced Materials (GSAM2015), 7-8, 2016.01.
17. Yoshifumi Ikoma, Formation of metastable phases and nanograins of Si and Ge by high-pressure torsion
, Proceedings of the International Workshop on Giant Straining Process for Advanced Materials (GSAM2015), 4-6, 2016.01.
18. Yoshifumi Ikoma, Takamitsu Toyota, Yoshimasa Ejiri, Katsuhiko Saito, Qixin Guo, Zenji Horita, Allotropic phase transformation and photoluminescence of germanium nanograins processed by high-pressure torsion, J. Mater. Sci., 10.1007/s10853-015-9328-y, 51, 1, 138-143, 2016.01.
19. Kaveh Edalati, Masashi Arimura, Yoshifumi Ikoma, Takeshi Daio, Moriji Miyata, David J. Smith, Zenji Horita, Plastic Deformation of BaTiO3 Ceramics by High-Pressure Torsion and Changes in Phase Transformations, Optical and Dielectric Properties , Materials Research Letters, 10.1080/21663831.2015.1065454, 3, 4, 216-221, 2015.10.
20. Yuta Fukushima, Kaveh Edalati, Yoshifumi Ikoma, Zenji Horita, David J. Smith, High Resolution TEM Observation of Nanocrystalline Silicon Fabricated by High Pressure Torsion (HPT), Microsc. Microanal., 10.1017/S1431927615009691, 21 (Suppl 3), 1783-1784, 2015.09.
21. Yoshifumi Ikoma, Kazunori Hayano, Kaveh Edalati, Katsuhiko Saito, Qixin Guo, Zenji Horita, Toshihiro Aoki, David J. Smith, Fabrication of nanograined silicon by high-pressure torsion, J. Mater. Sci., 10.1007/s10853-014-8250-z, 49, 19, 6565-6569, 2014.10.
22. Sivasankaran Harish, Mitsuru Tabara, Yoshifumi Ikoma, Zenji Horita, Yasuyuki Takata, David G Cahill, Masamichi Kohno, Thermal conductivity reduction of crystalline silicon by high-pressure torsion, Nanoscale Research Letters, 10.1186/1556-276X-9-326, 9, 326, 2014.06.
23. Yoshifumi Ikoma, Yoshimasa Ejiri, Kazunori Hayano, Katsuhiko Saito, Qixin Guo, Zenji Horita, Nanograin formation of GaAs by high-pressure torsion, Philos. Mag. Lett., 10.1080/09500839.2013.852265, 94, 1, 1-8, 2014.01.
24. Kaveh Edalati, Takeshi Daio, Yoshifumi Ikoma, Makoto ARITA, Zenji Horita, Graphite to diamond-like carbon phase transformation by high-pressure torsion, Appl. Phys. Lett., 10.1063/1.4816082, 103, 3, 034108, 2013.07.
25. Qixin Guo, Wangzhou Shi, Feng Liu, Makoto Arita, Yoshifumi Ikoma, Katsuhiko Saito, Tooru Tanaka, and Mitsuhiro Nishio, Effects of oxygen gas pressure on properties of iron oxide films grown by pulsed laser deposition, J. Alloys. Comp., 552, 1, 2013.03.
26. Yoshifumi Ikoma, Yuta Nishino, Shouhei Anan, Toshiaki Abe and Hirofumi Sakita, Nanopore formation on SOI(100) by CH3SiH3 pulse jet CVD: SiC growth temperature dependence, Mater. Sci. Forum, 10.4028/www.scientific.net/MSF.750.252, 750, 252-255, 2013.02.
27. Toshiaki Abe, Shouhei Anan, Fumiya Watanabe, Ryoji Takahashi and Yoshifumi Ikoma, Formation of nanocrystalline Si by Au-catalyzed CH3SiH3 pulse jet CVD, Mater. Sci. Forum, 10.4028/www.scientific.net/MSF.750.244, 750, 244-247, 2013.02.
28. Yoshifumi Ikoma, Kazunori Hayano, Kaveh Edalati, Katsuhiko Saito, Qixin Guo, and Zenji Horita, Phase transformation and nanograin refinement of silicon by processing through high-pressure torsion, Appl. Phys. Lett., 101, 12, 121908, 2012.09.
29. Fabi Zhang, Yoshifumi Ikoma, Jinping Zhang, Ke Xu, Katsuhiko Saito, and Qixin Guo, Characterization of epitaxial ZnTe layers grown on GaAs substrates by transmission electron microscopy and photoluminescence, J. Vac. Sci. Technol. A, 10.1116/1.3688498, 30, 2, 021508, 2012.03.
30. Jian Ding, Di Zhang, Makoto Arita, Yoshifumi Ikoma, Kazuki Nakamura, Katsuhiko Saito, Qixin Guo, Growth and characterization of Fe3O4 films, Materials Research Bulletin, 10.1016/j.materresbull.2011.09.008, 46, 12, 2212-2216, 2011.12.
31. Kaveh Edalati, Shoichi Toh, Yoshifumi Ikoma and Zenji Horita, Plastic deformation and allotropic phase transformations in zirconia ceramics during high-pressure torsion, Scripta Materialia, 10.1016/j.scriptamat.2011.08.024, 65, 11, 974-977 , 2011.12.
32. Yoshifumi Ikoma, Hafizal Yahaya, Keiji Kuriyama, Hirofumi Sakita, Yuta Nishino, and Teruaki Motooka, Semiconductor nanopores formed by chemical vapor deposition of heteroepitaxial SiC films on SOI(100) substrates
, J. Vac. Sci. Technol. B, 10.1116/1.3646471, 29, 6, 062001-1 - 062001-5, 2011.11.
33. Tomoaki Chikazawa, Hiroaki Miyake, Yoshifumi Ikoma, Makoto Arita, Teruaki Motooka, Self-assembled DNA networks on Si(100) observed by contact-mode AFM, Proceedings of International colloquium on “Recent progress in nanofabrications of MEMS and NEMS: Science and innovation technologies”, 36-37, 2011.03.
34. M. Arita, H. Sakamoto, Y. Tabata, Y. Ikoma, M. Masuda, Photo-electrochemical properties of photocatalytic titanium dioxide films prepared by RF magnetron sputtering, Proceedings of International colloquium on “Recent progress in nanofabrications of MEMS and NEMS: Science and innovation technologies”, 32-35, 2011.03.
35. Y. Ikoma, T. Motooka, H. Sakita, Hafizal Yahaya, H. Naramoto, K. Narumi, S. Sakai and Y. Maeda, Atomistic Study of Irradiation-induced Mass Transport Process, JAEA-Review: JAEA Takasaki Annual Report 2009, 2010-065, 130, 2011.01.
36. Hafizal Yahaya, Yoshifumi Ikoma, Keiji Kuriyama, and Teruaki Motooka , Fabrication of nanopores utilizing SiC/Si(001) heteroepitaxial growth on SOI substrates: nanopore density control, Proc. SPIE, 10.1117/12.888388, 7995, 799520, Proc. SPIE 7995, 799520 (2010); doi:10.1117/12.888388.
37. Yoshifumi Ikoma, Hafizal Yahaya, Hirofumi Sakita, Yuta Nishino, and Teruaki Motooka, Position-controlled formation of Si nanopores by chemical vapor deposition of SiC/SOI(100), Proc. SPIE, 10.1117/12.888531, 7995, 79951Y, Proc. SPIE 7995, 79951Y (2010); doi:10.1117/12.888531.
38. M. Arita, H. Sakamoto, Y. Tabata, Y. Ikoma, M. Masuda, Photo-electrochemical properties and photo-catalytic activities of titanium dioxide thin films prepared by RF magnetron sputtering method, Proceedings of the 12th international symposium on material science and engineering between Kyushu University and Chonbuk National University, 31-37, 2010.10.
39. Yoshifumi Ikoma, Ryousuke Okuyama, Makoto Arita, Teruaki Motooka, Formation and structural characterization of nanocrystalline Si/SiC multilayers grown by hot filament assisted chemical vapor deposition using CH3SiH3 gas jets, Thin Solid Films , doi:10.1016/j.tsf.2009.10.127, 518, 14, 3759–3762, 518 (14) 3759–3762, 2010.04.
40. Ruijing Zhang, Yoshifumi Ikoma and Teruaki Motooka, Negative capillary-pressure-induced cavitation probability in nanochannels, Nanotechnology, doi:10.1088/0957-4484/21/10/105706, 21, 105706 (5pp), 21 105706 (2010), 2010.02.
41. Y. Ikoma, T. Motooka, S. Munetoh, H. Sakita, Hafizal bin Yahaya, H. Naramoto, K. Narumi, S. Sakai and Y. Maeda, Smart-Cut Processes for Nanopore Device Formation on SIMOX(100) , JAEA-Review: JAEA Takasaki Annual Report 2008, 2009-041, 126, 2009.12.
42. T. Motooka, Y. Ikoma, S. Munetoh, Lei Yang, H. Naramoto, K. Narumi, S. Sakai and Y. Maeda, Structural Change in Si Induced by Ion Bombardments and Its Application for Nano-Fabrication (II) , JAEA-Review: JAEA Takasaki annual report 2007 , 2008-055, 140, 2008.11.
43. Yoshifumi Ikoma, Kenta Ono, Mutsunori Uenuma, Tomohiko Ogata, Teruaki Motooka, New approach to formation of nanopore on SOI: SiC/Si heteroepitaxial growth by supersonic jet CVD, Proceedings of SPIE, Vol. 6984, 69841V-1 - 69841V-6, 2008.03.
44. T. Motooka, Y. Ikoma, S. Munetoh, X.Q. Cheng, H. Naramoto, K. Narumi, S. Sakai and Y. Maeda, Structural Change in Si Induced by Ion Bombardments and Its Application for Nano-Fabrication, JAEA-Review: JAEA Takasaki annual report 2006 , 2007-060, 169, 2008.03.
45. H. Naramoto, K. Narumi, S. Sakai, Y. Maeda, T. Motooka, Y. Ikoma, S. Munetoh and X-q. Cheng, Study of Mass-transport Process in Noncrystalline Films Using Ion Beam Technique, JAEA-Review: JAEA Takasaki annual report 2006 , 2007-060, 165, 2008.03.
46. Yoshifumi Ikoma, Takayoshi Masaki, Shinji Kawai, and Teruaki Motooka, Formation of silicon nanodots from dysprosium-doped amorphous SiCxOy films grown by hot-filament assisted chemical vapor deposition of CH3SiH3 and Dy(DPM)3 gas jets, Applied Surface Science, vol. 253, No. 31, pp. 8657-8660., 2007.08.
47. Ryota Ohtani, Yoshifumi Ikoma and Teruaki Motooka, Formation of Si/SiC Heterostructures on Si(100) by Hot-Filament-Assisted CH3SiH3 Gas Jet Chemical Vapor Deposition, Jpn. J. Appl. Phys., Vol. 45, No. 4A, pp. 2514-2515, 2006.01.
48. M. Uenuma, Y. Ikoma, Y. Kato, T. Motooka, Design and fabrication of temperature-independent arrayed-waveguide grating demultiplexers on SOI substrates, 2005 IEEE International SOI Conference, Proceedings, 10.1109/SOI.2005.1563557 , 114-115, 2005.10.
49. T. Iwanaga, S. Yagi, Y. Ikoma, and T. Motooka, Effects of Mg doping on growth and structures of polycrystalline GaN by remote plasma MOCVD, J. Crystal Growth, 10.1016/j.jcrysgro.2004.09.072, 274, 1-2, 1-5, 274, 1-5, 2005.01.
50. Y. Ikoma, R. Ohtani, and T. Motooka, Formation of SiC/Si Multilayer Structures on Si(100) by Supersonic Free Jets of Single Gas Source CH3SiH3, Materials Science Forum, 457-460, 325-328, 457-460, 325, 2004.01.
51. R. Ohtani, Y. Ikoma and T. Motooka, Formation of Si/SiC heterostructures for silicon-based quantum devices using single CH3SiH3-gas source free jet, MRS Proceedings, 815, 83-88, 815, J5.11 doi:10.1557/PROC-815-J5.11 , 2004.01.
52. SiC/Si-dots multilayer structures formed by supersonic free jets of CH3SiH3 and Si3H8
Yoshifumi Ikoma Ryota Ohtani Nobuaki Matsui and Teruaki Motooka
J. Vac.Sci. Technol. B
Vol.21 6(2003)pp.2492-2495..
53. Hole Resonant Tunneling through SiC/Si-dot/SiC Heterostructures
Y. Ikoma K. Uchiyama F. Watanabe and T. Motooka
Materials Science Forum
Vol.389-393 (2002)pp.751-754..
54. Formation and current-voltage characteristics of SiC/Si-dot/SiC resonant tunneling diodes
Y. Ikoma T. Tada K. Uchiyama F. Watanabe and T. Motooka
Solid State Phenomena
Vol.78-79 (2001)pp.157-162..
55. Distribution of dispersoids in 6000 series aluminum alloys revealed by TEM stereoscopy
Y. Miura K. Yamada and Y. Ikoma
INTERNATIONAL JOURNAL OF MATERIALS & PRODUCT TECHNOLOGY
Vol.Suppl. 1 (0)pp.362-369..
56. Carbonization of SIMOX substrates for fabrication of single-crystal SiC-on-insulator
S. Harada M. Arita Y. Ikoma and T. Motooka
Materials Science Forum
Vol.338-342 (2000)pp.297-300..
57. Growth of 3C-SiC/Si Multilayer Heterostructures by Supersonic Free Jets
Y. Ikoma T. Endo T. Tada F. Watanabe and T. Motooka
Materials Science Forum
Vol.338-342 (2000)pp.265-268..
58. Strong interface-induced changes on the numerical calculated Raman scattering in Si/3C-SiC superlattices
E. F. Bezerra V. N. Freire A. G. Souza J. Mendes V. Lemos Y. Ikoma F. Watanabe and T. Motooka
Appl. Phys. Lett.
Vol.77 26(2000)pp.4316-4318..
59. Growth of Si/3C-SiC/Si(100) heterostructures by pulsed supersonic free jets
Y. Ikoma T. Endo F. Watanabe and T. Motooka
Appl. Phys. Lett.
Vol.75 25(1999)pp.3977-3979..
60. Growth of Ultrathin Epitaxial 3C-SiC Films on Si(100) by Pulsed Supersonic Free Jets of CH3SiH3
Y. Ikoma T. Endo F. Watanabe and T. Motooka
Jpn. J. Appl. Phys.
Vol.38 3B(1999)pp.L301-L303..
61. Epitaxial growth of 3C-SiC on Si(100) by pulsed supersonic free jets of Si(CH3)4 and Si3H8
Y. Ikoma T. Endo F. Watanabe and T. Motooka
J. Vac. Sci. Technol. A
Vol.16 2(1998)pp.763-765..
62. Thermal desorption spectroscopy and molecular-beam time-of-flight studies of silicon wafer ultraviolet/ozone cleaning
K. Yamaguchi Y. Uematsu Y. Ikoma F. Watanabe T. Motooka and T. Igarashi
J. Vac. Sci. Technol. B
Vol.15 2(1997)pp.277-281..
63. Epitaxial growth of β-SiC by tetramethylsilane supersonic free jets: precursor control effects
Y. Ikoma F. Watanabe and T. Motooka
Inststute of Physics Conference Series
Vol.142 (1996)pp.221-224..