Akihiko Hirata

2013

Geometrically controlled nanoporous PdAu bimetallic catalysts with tunable Pd/Au ratio for direct ethanol fuel cells

Chen, L. Y., Chen, N., Hou, Y., Wang, Z. C., Lv, S. H., Fujita, T., Jiang, J. H., Hirata, A. & Chen, M. W., 2013, In: ACS Catalysis. 3, 6, p. 1220-1230 11 p.

研究成果: Article › 査読

140 被引用数 (Scopus)

Geometric frustration of icosahedron in metallic glasses

Hirata, A., Kang, L. J., Fujita, T., Klumov, B., Matsue, K., Kotani, M., Yavari, A. R. & Chen, M. W., 2013, In: Science. 341, 6144, p. 376-379 4 p.

研究成果: Article › 査読

316 被引用数 (Scopus)

High-energy-density nonaqueous MnO₂@nanoporous gold based supercapacitors

Chen, L. Y., Kang, J. L., Hou, Y., Liu, P., Fujita, T., Hirata, A. & Chen, M. W., 2013 8月 28, In: Journal of Materials Chemistry A. 1, 32, p. 9202-9207 6 p.

研究成果: Article › 査読

81 被引用数 (Scopus)

In situ atomic-scale observation of continuous and reversible lattice deformation beyond the elastic limit

Wang, L., Liu, P., Guan, P., Yang, M., Sun, J., Cheng, Y., Hirata, A., Zhang, Z., Evan, M., Chen, M. & Han, X., 2013, In: Nature communications. 4, 2413.

研究成果: Article › 査読

Open Access

143 被引用数 (Scopus)

Microstructure characterization of Cu-rich nanoprecipitates in a Fe-2.5 Cu-1.5 Mn-4.0 Ni-1.0 Al multicomponent ferritic alloy

Wen, Y. R., Hirata, A., Zhang, Z. W., Fujita, T., Liu, C. T., Jiang, J. H. & Chen, M. W., 2013 4月, In: Acta Materialia. 61, 6, p. 2133-2147 15 p.

研究成果: Article › 査読

145 被引用数 (Scopus)

Nanoporous gold based optical sensor for sub-ppt detection of mercury ions

Zhang, L., Chang, H., Hirata, A., Wu, H., Xue, Q. K. & Chen, M., 2013 5月 28, In: ACS Nano. 7, 5, p. 4595-4600 6 p.

研究成果: Article › 査読

172 被引用数 (Scopus)

Synergistic alloying effect on microstructural evolution and mechanical properties of Cu precipitation-strengthened ferritic alloys

Wen, Y. R., Li, Y. P., Hirata, A., Zhang, Y., Fujita, T., Furuhara, T., Liu, C. T., Chiba, A. & Chen, M. W., 2013 12月, In: Acta Materialia. 61, 20, p. 7726-7740 15 p.

研究成果: Article › 査読

82 被引用数 (Scopus)

2012

Atomic origins of the high catalytic activity of nanoporous gold

Fujita, T., Guan, P., McKenna, K., Lang, X., Hirata, A., Zhang, L., Tokunaga, T., Arai, S., Yamamoto, Y., Tanaka, N., Ishikawa, Y., Asao, N., Yamamoto, Y., Erlebacher, J. & Chen, M., 2012 9月, In: Nature Materials. 11, 9, p. 775-780 6 p.

研究成果: Article › 査読

734 被引用数 (Scopus)

Characterization of oxide nanoprecipitates in an oxide dispersion strengthened 14YWT steel using aberration-corrected STEM

Hirata, A., Fujita, T., Liu, C. T. & Chen, M. W., 2012 9月, In: Acta Materialia. 60, 16, p. 5686-5696 11 p.

研究成果: Article › 査読

70 被引用数 (Scopus)

Deposition of multicomponent metallic glass films by single-target magnetron sputtering

Liu, Y. H., Fujita, T., Hirata, A., Li, S., Liu, H. W., Zhang, W., Inoue, A. & Chen, M. W., 2012 2月, In: Intermetallics. 21, 1, p. 105-114 10 p.

研究成果: Article › 査読

48 被引用数 (Scopus)

Direct observation of interlocked domain walls in hexagonal RMnO ₃ (R=Tm, Lu)

Zhang, Q. H., Wang, L. J., Wei, X. K., Yu, R. C., Gu, L., Hirata, A., Chen, M. W., Jin, C. Q., Yao, Y., Wang, Y. G. & Duan, X. F., 2012 1月 9, In: Physical Review B - Condensed Matter and Materials Physics. 85, 2, 020102.

研究成果: Article › 査読

54 被引用数 (Scopus)

Direct synthesis of fullerene-intercalated porous carbon nanofibers by chemical vapor deposition

Kang, J., Qin, K., Zhang, H., Hirata, A., Wang, J., Chen, M., Zhao, N., Sun, R., Fujita, T., Shi, C. & Qiao, Z., 2012 11月, In: Carbon. 50, 14, p. 5162-5166 5 p.

研究成果: Article › 査読

13 被引用数 (Scopus)

Electron diffraction study on chemical short-range order in covalent amorphous solids

Ishimaru, M., Hirata, A. & Naito, M., 2012 4月 15, In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms. 277, p. 70-76 7 p.

研究成果: Article › 査読

3 被引用数 (Scopus)

Enhanced mechanical properties of nanocrystalline boron carbide by nanoporosity and interface phases

Madhav Reddy, K., Guo, J. J., Shinoda, Y., Fujita, T., Hirata, A., Singh, J. P., McCauley, J. W. & Chen, M. W., 2012, In: Nature communications. 3, 1052.

研究成果: Article › 査読

Open Access

105 被引用数 (Scopus)

Fabrication of nickel/organic-molecule/nickel nanoscale junctions utilizing thin-film edges and their structural and electrical properties

Kaiju, H., Kondo, K., Basheer, N., Kawaguchi, N., White, S., Hirata, A., Ishimaru, M., Hirotsu, Y. & Ishibashi, A., 2012 6月, In: Japanese journal of applied physics. 51, 6 PART 1, 065202.

研究成果: Article › 査読

2 被引用数 (Scopus)

Influence of aging and thermomechanical treatments on the mechanical properties of a nanocluster-strengthened ferritic steel

Zhang, Z. W., Liu, C. T., Wen, Y. R., Hirata, A., Guo, S., Chen, G., Chen, M. W. & Chin, B. A., 2012 1月, In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science. 43, 1, p. 351-359 9 p.

研究成果: Article › 査読

38 被引用数 (Scopus)

Innovative processing of high-strength and low-cost ferritic steels strengthened by Y-Ti-O nanoclusters

Wen, Y., Liu, Y., Hirata, A., Liu, F., Fujita, T., Dou, Y., Liu, D., Liu, B., Liu, Z. & Liu, C. T., 2012 5月 15, In: Materials Science and Engineering A. 544, p. 59-69 11 p.

研究成果: Article › 査読

26 被引用数 (Scopus)

Origin of ferromagnetism and oxygen-vacancy ordering induced cross-controlled magnetoelectric effects at room temperature

Wei, X. K., Zou, T., Wang, F., Zhang, Q. H., Sun, Y., Gu, L., Hirata, A., Chen, M. W., Yao, Y., Jin, C. Q. & Yu, R. C., 2012 4月 1, In: Journal of Applied Physics. 111, 7, 073904.

研究成果: Article › 査読

32 被引用数 (Scopus)

Structural origins of the excellent glass forming ability of Pd ₄₀Ni ₄₀P ₂₀

Guan, P. F., Fujita, T., Hirata, A., Liu, Y. H. & Chen, M. W., 2012 4月 24, In: Physical Review Letters. 108, 17, 175501.

研究成果: Article › 査読

108 被引用数 (Scopus)

2011

Atomic structure of nanoclusters in oxide-dispersion-strengthened steels

Hirata, A., Fujita, T., Wen, Y. R., Schneibel, J. H., Liu, C. T. & Chen, M. W., 2011 12月, In: Nature Materials. 10, 12, p. 922-926 5 p.

研究成果: Article › 査読

300 被引用数 (Scopus)

Characterization of nanoscale mechanical heterogeneity in a metallic glass by dynamic force microscopy

Liu, Y. H., Wang, D., Nakajima, K., Zhang, W., Hirata, A., Nishi, T., Inoue, A. & Chen, M. W., 2011 3月 23, In: Physical Review Letters. 106, 12, 125504.

研究成果: Article › 査読

328 被引用数 (Scopus)

Direct observation of local atomic order in a metallic glass

Hirata, A., Guan, P., Fujita, T., Hirotsu, Y., Inoue, A., Yavari, A. R., Sakurai, T. & Chen, M., 2011 1月, In: Nature Materials. 10, 1, p. 28-33 6 p.

研究成果: Article › 査読

415 被引用数 (Scopus)

Effect of residual silver on surface-enhanced raman scattering of dealloyed nanoporous gold

Zhang, L., Chen, L., Liu, H., Hou, Y., Hirata, A., Fujita, T. & Chen, M., 2011 10月 13, In: Journal of Physical Chemistry C. 115, 40, p. 19583-19587 5 p.

研究成果: Article › 査読

66 被引用数 (Scopus)

Enhancement of nanovoid formation in annealed amorphous Al ₂O₃ including W

Nakamura, R., Ishimaru, M., Hirata, A., Sato, K., Tane, M., Kimizuka, H., Shudo, T., Konno, T. J. & Nakajima, H., 2011 9月 15, In: Journal of Applied Physics. 110, 6, 064324.

研究成果: Article › 査読

12 被引用数 (Scopus)

Modulated Na₂Ti₄O₉:Zr nanobelt via site-specific Zr doping

He, X., Wang, Z., Hirata, A., Gu, L., Chen, M. & Duan, X., 2011 8月, In: Applied Physics Express. 4, 8, 085003.

研究成果: Article › 査読

3 被引用数 (Scopus)

Nanoporous metal/oxide hybrid electrodes for electrochemical supercapacitors

Lang, X., Hirata, A., Fujita, T. & Chen, M., 2011 4月, In: Nature Nanotechnology. 6, 4, p. 232-236 5 p.

研究成果: Article › 査読

1793 被引用数 (Scopus)

Nanoporous PdNi bimetallic catalyst with enhanced electrocatalytic performances for electro-oxidation and oxygen reduction reactions

Chen, L., Guo, H., Fujita, T., Hirata, A., Zhang, W., Inoue, A. & Chen, M., 2011 11月 22, In: Advanced Functional Materials. 21, 22, p. 4364-4370 7 p.

研究成果: Article › 査読

240 被引用数 (Scopus)

Nanovoid formation through the annealing of amorphous Al₂O ₃ and WO₃ films

Nakamura, R., Shudo, T., Hirata, A., Ishimaru, M. & Nakajima, H., 2011 1月, In: Scripta Materialia. 64, 2, p. 197-200 4 p.

研究成果: Article › 査読

18 被引用数 (Scopus)

Surface and interface structures and magnetic properties of Ni and Ni ₇₅Fe₂₅ thin films on polyethylene naphthalate Organic Substrates

Kaiju, H., Basheer, N., Abe, T., Kondo, K., Hirata, A., Ishimaru, M., Hirotsu, Y. & Ishibashi, A., 2011, In: Journal of the Vacuum Society of Japan. 54, 3, p. 203-206 4 p.

研究成果: Article › 査読

Wrinkled nanoporous gold films with ultrahigh surface-enhanced raman scattering enhancement

Zhang, L., Lang, X., Hirata, A. & Chen, M., 2011 6月 28, In: ACS Nano. 5, 6, p. 4407-4413 7 p.

研究成果: Article › 査読

231 被引用数 (Scopus)

2010

Deformation-induced change in the structure of metallic glasses during multistep indentation

Pan, D., Liu, H. W., Fujita, T., Hirata, A., Inoue, A., Sakurai, T. & Chen, M. W., 2010 4月 12, In: Physical Review B - Condensed Matter and Materials Physics. 81, 13, 132201.

研究成果: Article › 査読

8 被引用数 (Scopus)

Quasicrystal-like structure and its crystalline approximant in an Fe ₄₈Cr₁₅Mo₁₄C₁₅B₆Tm ₂ bulk metallic glass

Hirata, A., Hirotsu, Y., Amiya, K. & Inoue, A., 2010 8月, In: Journal of Alloys and Compounds. 504, SUPPL. 1, p. S186-S189

研究成果: Article › 査読

10 被引用数 (Scopus)

Structure analyses of fe-based metallic glasses by electron diffraction

Hirata, A. & Hirotsu, Y., 2010, In: Materials. 3, 12, p. 5263-5273 11 p.

研究成果: Article › 査読

Open Access

10 被引用数 (Scopus)

The fabrication of Ni quantum cross devices with a 17nm junction and their current-voltage characteristics

Kaiju, H., Kondo, K., Ono, A., Kawaguchi, N., Won, J., Hirata, A., Ishimaru, M., Hirotsu, Y. & Ishibashi, A., 2010, In: Nanotechnology. 21, 1, 015301.

研究成果: Article › 査読

5 被引用数 (Scopus)

2009

Analysis of crystalline nano structures embedded in amorphous films by selected area nano diffraction in a Cs-corrected TEM

Yamasaki, J., Morishita, S., Tanaka, N., Hirata, A., Hirotsu, Y. & Kato, T., 2009 7月, In: Microscopy and Microanalysis. 15, SUPPL. 2, p. 760-761 2 p.

研究成果: Article › 査読

Open Access

Crystallization behaviours around the glass transition temperature in an amorphous Fe-Nb-B alloy

Hirata, A., Hirotsu, Y. & Matsubara, E., 2009 10月, In: Intermetallics. 17, 10, p. 796-801 6 p.

研究成果: Article › 査読

10 被引用数 (Scopus)

Fe₂₃B₆ -type quasicrystal-like structures without icosahedral atomic arrangement in an Fe-based metallic glass

Hirata, A., Hirotsu, Y., Amiya, K., Nishiyama, N. & Inoue, A., 2009 10月 29, In: Physical Review B - Condensed Matter and Materials Physics. 80, 14, 140201.

研究成果: Article › 査読

28 被引用数 (Scopus)

Irradiation-induced amorphous structures studied by electron diffraction radial distribution function analysis

Ishimaru, M., Naito, M. & Hirata, A., 2009 7月, In: Microscopy and Microanalysis. 15, SUPPL. 2, p. 1346-1347 2 p.

研究成果: Article › 査読

Open Access

1 被引用数 (Scopus)

Local structural fluctuation in Pd-Ni-P bulk metallic glasses examined using nanobeam electron diffraction

Hirata, A., Hirotsu, Y., Kuboya, S. & Nieh, T. G., 2009 8月 26, In: Journal of Alloys and Compounds. 483, 1-2, p. 64-69 6 p.

研究成果: Article › 査読

14 被引用数 (Scopus)

Local structure changes on annealing in an Fe-Si-B-P bulk metallic glass

Hirata, A., Kawahara, N., Hirotsu, Y. & Makino, A., 2009 4月, In: Intermetallics. 17, 4, p. 186-189 4 p.

研究成果: Article › 査読

25 被引用数 (Scopus)

Nanoscale metastable state exhibiting pseudotenfold diffraction pattern in Fe-based bulk metallic glass

Hirata, A., Hirotsu, Y., Amiya, K. & Inoue, A., 2009 1月 5, In: Physical Review B - Condensed Matter and Materials Physics. 79, 2, 020205.

研究成果: Article › 査読

10 被引用数 (Scopus)

Ni thin films vacuum-evaporated on polyethylene naphthalate substrates with and without the application of magnetic field

Kaiju, H., Ono, A., Kawaguchi, N., Kondo, K., Ishibashi, A., Won, J., Hirata, A., Ishimaru, M. & Hirotsu, Y., 2009 1月 1, In: Applied Surface Science. 255, 6, p. 3706-3712 7 p.

研究成果: Article › 査読

10 被引用数 (Scopus)

Specific surface effect on transport properties of NiO/MgO heterostructured nanowires

Oka, K., Yanagida, T., Nagashima, K., Tanaka, H., Seki, S., Honsho, Y., Ishimaru, M., Hirata, A. & Kawai, T., 2009, In: Applied Physics Letters. 95, 13, 133110.

研究成果: Article › 査読

22 被引用数 (Scopus)

2008

Crystallization process and glass stability of an Fe₄₈Cr ₁₅ Mo₁₄C₁₅B₆Tm₂ bulk metallic glass

Hirata, A., Hirotsu, Y., Amiya, K. & Inoue, A., 2008 10月 27, In: Physical Review B - Condensed Matter and Materials Physics. 78, 14, 144205.

研究成果: Article › 査読

40 被引用数 (Scopus)

Direct observations of thermally induced structural changes in amorphous silicon carbide

Ishimaru, M., Hirata, A., Naito, M., Bae, I. T., Zhang, Y. & Weber, W. J., 2008 8月 25, In: Journal of Applied Physics. 104, 3, 033503.

研究成果: Article › 査読

37 被引用数 (Scopus)

Nanocrystallization of complex Fe₂₃B₆-type structure in glassy Fe-Co-B-Si-Nb alloy

Hirata, A., Hirotsu, Y., Amiya, K., Nishiyama, N. & Inoue, A., 2008 4月, In: Intermetallics. 16, 4, p. 491-497 7 p.

研究成果: Article › 査読

50 被引用数 (Scopus)

Role of the triclinic Al₂Fe structure in the formation of the Al₅Fe₂-approximant

Hirata, A., Mori, Y., Ishimaru, M. & Koyama, Y., 2008 7月, In: Philosophical Magazine Letters. 88, 7, p. 491-500 10 p.

研究成果: Article › 査読

6 被引用数 (Scopus)

2007

Direct imaging of local atomic ordering in a Pd-Ni-P bulk metallic glass using C_s-corrected transmission electron microscopy

Hirata, A., Hirotsu, Y., Nieh, T. G., Ohkubo, T. & Tanaka, N., 2007 2月, In: Ultramicroscopy. 107, 2-3, p. 116-123 8 p.

研究成果: Article › 査読

24 被引用数 (Scopus)

Local atomic structure analysis of Zr-Ni and Zr-Cu metallic glasses using electron diffraction

Hirata, A., Morino, T., Hirotsu, Y., Itoh, K. & Fukunaga, T., 2007 6月, In: Materials Transactions. 48, 6, p. 1299-1303 5 p.

研究成果: Article › 査読

26 被引用数 (Scopus)

Local structure study of metallic glasses by means of advanced electron microscopy techniques

Hirotsu, Y. & Hirata, A., 2007 11月, In: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy. 54, 11, p. 747-753 7 p.

研究成果: Article › 査読

平田 秋彦

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平田秋彦