Takayoshi Sasaki

Takayoshi Sasaki
Affiliation:
Specialty:
Nanosheet and Softchemistry
Academic degree:
Ph.D. (Science) The University of Tokyo (1986)
Recent publications
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Educational and Working History

2009 NIMS Fellow
2006 Managing director, Nanoscale Materials Center
2003 Director, Soft chemistry group, NIMS
2001 Senior researcher, National Institute for Materials Science (NIMS; reorganized from NIRIM)
1988 Senior researcher, NIRIM
1986 - 1987 Visiting scholar, University of California, Berkeley
1980 Researcher, National Institute for Research in Inorganic Materials (NIRIM)
1986 Doctor of Science, The University of Tokyo

Research History

Takayoshi Sasaki has been working on the synthesis and characterizations of a variety of layered host compounds. His particular interest has been directed to soft-chemical synthesis utilizing their chemical reactions, e. g., intercalation. He is one of pioneers for investigation on delamination since he found that a layered titanate undergoes total exfoliation into colloidal single layers for the first time. Since then, he succeeded in synthesizing a number of functional oxide and hydroxide nanosheets such as MnO2, Cs4W11O36, and Co(OH)2. He has demonstrated that these nanosheets show novel physicochemical properties associated with the extremely high 2D anisotropy having a molecular thickness. One of the highlights in the course of such study is the discovery of superconductivity in 2D CoO2 sheets, which is a very hot topic in recent years.

Furthermore, he has demonstrated that nanosheets can be organized or assembled into various nanostructured materials such as nanofilms, nanotubes, nanoshells, and lamellar aggregates. Useful functionalities such as photocatalysis, dielectric and ferromagnetic properties have been achieved through this synthetic strategy by combining nanosheets with a range of materials (polyions, clusters, metal complexes) and controlling their nanoarchitectures. Some of the developments, for example, fabrication procedures TiO2 flaky particulates, have been transferred to industry. These achievements have been highly recognized in the community of materials science.

Related Links

Selected Papers

  1. Redoxable nanosheet crystallites of MnO2 derived via delamination of a layered manganate
    Omomo Y, Sasaki T, Wang LZ, Watanabe M
    J Am Chem Soc, 2003; 125(12): 3568.
  2. Superconductivity in two-dimensional CoO2 layers
    Takada K, Sakurai H, Takayama-Muromachi E, Izumi F, Dilanian RA, Sasaki T
    Nature, 2003; 422: 53-55.
  3. Electronic band structure for titania semiconductor nanosheets revealed by electrochemical and photoelectrochemical studies
    Sakai N, Ebina Y, Takada K, Sasaki T
    J Am Chem Soc, 2004; 126(18): 5851.
  4. Synthesis, anion exchange, and delamination of Co-Al layered double hydroxide. Assembly of the exfoliated nanosheet/polyanion composite films and magneto-optical studies
    Liu Z, Ma R, Osada M, Iyi N, Ebina Y, Takada K, Sasaki T
    J Am Chem Soc, 2006; 128(14); 4872.
  5. Gigantic magneto-optical effects in multilayer-assemblies of two-dimensional titania nanosheets
    Osada M, Ebina Y, Takada K, Sasaki T
    Adv Mater, 2006; 18(3): 295-299.
  6. High-κ dielectric nano-films fabricated with titania nanosheets
    Osada M, Ebina Y, Funakubo H, Yokoyama S, Kiguchi T, Takada K, Sasaki T
    Adv Mater, 2006; 18(8): 1023-1027.
  7. Topochemical synthesis of monometallic (Co2+-Co3+) layered double hydroxide and its exfoliation into positively charged Co(OH)2 nanosheets
    Ma R, Takada K, Fukuda K, Iyi N, Bando Y, Sasaki T
    Angew Chem Int Ed, 2008; 47(1): 86-89.
  8. Exfoliated nanosheet crystallite of cesium tungstate with 2D pyrochlore structure: Synthesis, characterization and photochromic properties
    Fukuda K, Akatsuka K, Ebina Y, Ma R, Takada K, Nakai I, Sasaki T
    ACS Nano, 2008; 2(8): 1689-1695.
  9. One-nanometer-thick seed layer of unilamellar nanosheets promotes oriented growth of oxide crystal films
    Shibata T, Fukuda K, Ebina Y, Kogure H, Sasaki T
    Adv Mater, 2008; 20(2): 231-235.
  10. General synthesis and structural evolution of a layered family Ln8(OH)20Cl4·nH2O (Ln = Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm and Y)
    Geng F, Matsushita Y, Ma R, Xin H, Tanaka M, Izumi F, Iyi N, Sasaki T
    J Am Chem Soc, 2008; 130(48): 16344-16350.
  11. Construction of highly ordered lamellar nanostructures through Langmuir-Blodgett deposition of molecularly thin titania nanosheets tens of micrometers wide and their excellent dielectric properties
    Akatsuka K, Haga M, Ebina Y, Osada M, Fukuda K, Sasaki T
    ACS Nano, 2009; 3(5): 1097-1106.