2009 Fiscal Year Final Research Report
Elucidation of Electron Transport Properties of Small Gold Nanoparticle Superlattices Connected with Parallel and Perpendicular π-Conjugated System
| Project/Area Number |
19205016
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Functional materials chemistry
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| Research Institution | University of Tsukuba |
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Principal Investigator |
TERANISHI Toshiharu University of Tsukuba, 大学院・数理物質科学研究科, 教授 (50262598)
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| Co-Investigator(Renkei-kenkyūsha) |
KANEHARA Masayuki 筑波大学, 大学院・数理物質科学研究科, 助教 (40375415)
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| Project Period (FY) |
2007 – 2009
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| Keywords | ナノ材料 / 少数電子素子 / トンネル現象 / ナノ粒子 / 自己組織化 / π共役系 / 電子輸送特性 |
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| Research Abstract |
When the small Au nanoparticles are used as single-electron islands for single-electron devices operated at room temperature, the tunneling resistance of organic ligands should be low as well as the quantum resistance. We developed a facile method to control the size of Au nanopaticles even by using hexanethiol with the tunneling resistance of～MΩ. For further reduction of the tunneling resistance, various macrocyclic π-conjugated ligands were adsorbed on the Au nanoparticles in a face-coordination fashion. Very interestingly, we found quite unique optical properties as well as drastic reduction of the tunneling resistance due to the electronic interaction beween the π-orbitals and Au orbitals. We also succeeded in the large-scale synthesis of Au_<25> clusters. On the other hand, small Au nanoparticles were found to exhibit single-electron transport property and Coulomb blockade at room temperature.
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