2006 Fiscal Year Final Research Report Summary
Organic Inorganic Hybrid-Type Spin-polarized Nanoparticle
| Project/Area Number |
15087101
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| Research Category |
Grant-in-Aid for Scientific Research on Priority Areas
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SUGAWARA Tadashi The University of Tokyo, Graduate School of Arts and Sciences, Professor, 大学院総合文化研究科, 教授 (50124219)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUSHITA Michio The University of Tokyo, Graduate School of Arts and Sciences, Assistant Professor, 大学院総合文化研究科, 助手 (80295477)
KAWADA Yuzo lbaraki University, College of Science, Professor, 理学部, 教授 (10152969)
TANAKA Tsuyoshi Tokyo University of Agriculture and Technology, Institute of Symbiotic Science and Technology, Lecturer, 工学部, 講師 (20345333)
MURATA Shigeru The University of Tokyo, Graduate School of Arts and Sciences, Associate Professor, 大学院総合文化研究科, 助教授 (40192447)
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| Project Period (FY) |
2003 – 2006
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| Keywords | spin-polarized wire / gold nanoparticle / nano-gap electrodes / negative magneto-resistance / non-linear conductivity / magnetotactic bacterium / micro-cristalline magnetite / NO-cage compound |
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| Research Abstract |
I. Negative magneto-resistance in spin-polarized molecular network connecting gold nano-particles
(1) Spin-polarized molecular network composed of spin-polarized wire molecules and gold nanoparticles (d=4 nm) exhibited negative magneto-resistance (4% at 4.2 K, 6 T). (2) A network of a few numbers of nanoparticles was prepared on nano-gap electrodes and it exhibited the I-V characteristic of a Coulomb diamond. (3) Linear type wire molecules, e.g. oligothiophene 21mer (molecular length of 7nm), and three-branched wire molecules were synthesized.
II. Coexisting system of conductivity and magnetism in ion radical salt of ETBN (1) Ion radical salt of ETBN exhibited the negative magneto-resistance (-5% at 11K 5T) for the first time as a genuine organic donor radical. (2) Non-linear conductivity was observed in an ion radical salt of the cross-cyclophane-type donor. The mechanism was reveled by X-ray crystal analysis under application of the electric current.
III. Magnetic behavior of bio-minerallized nano-magnets in magnetotactic bacteria An assembly of nano-magnetites (d=65nm) bio-minerallized in magnetotactic bacteria exhibited negative magneto-resistance of 5% at 100 K.
IV Novel NO-cage compound with high efficiency of photo-decomposition A substituent that induces intersystem-crossing or electron transfer was introduced to N-nitrosoaniline to enhance the quantum yield of photo-decomposition in order to develop versatile NO-cage compounds
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