2003 Fiscal Year Final Research Report Summary
Syntheses of Novel Metallofullerene Nano-Peapods
| Project/Area Number |
14204059
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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 |
Physical chemistry
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| Research Institution | Nagoya University |
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Principal Investigator |
SHINOBARA Hisashi Nagoya University, Chemistry Department, Professor, 大学院・理学研究科, 教授 (50132725)
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| Co-Investigator(Kenkyū-buntansha) |
SUGAI Toshiki Nagoya University, Research Center for Materials Science, Research Associate, 物質科学国際研究センター, 助手 (50262845)
OKAZAKI Toshiya Nagoya University, Chemistry Department, Research Associate, 大学院・理学研究科, 助手 (90314054)
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| Project Period (FY) |
2002 – 2003
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| Keywords | fullerenes / matallofullerenes / carbon nanotubes / nano-peapods / STM / HRTEM / EELS / FET / device |
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| Research Abstract |
One of the fascinating features of metallofullerene-peapods (CNT encaging fullerenes) such as Gd@C_<82> peapods is that we can perform a 'local band gap engineering' at the site where a fullerene is endothermally inserted. Previous TEM images and electron energy loss spectra suggested that the metallofullerenes can be spaced regularly as close as 1.1 nm in a high-density 'peapod' structure, while 1.1-3 nm spacing was often observed in a low-density peapod. In the present Gd@C_<82> peapod samples, about 10% of over 200 SWNT images showed locally modified semiconducting band gaps.
Scanning tunneling microscopy and spectroscopy (dI/dY) give bias-dependent topographic images and local density of states (LDS) on carbon nanotubes near the fermi level. In the STS map, two strong VHS peaks corresponding to conduction and valence band edges are clearly seen with two smaller ones at higher bias voltages. The original band gap of 0.43 eV is narrowed down to 0.17 eV where the fullerene is expected to be located.
Furthermore, Gd@C_<82> peapods exhibit ambipolar FET behavior with both n-and p-channels easily accessible by simple electrostatic gates. Similar results were obtained from more than 10 independent devices composed of a small bundle of Gd@C_<82> peapods. Such ambipolar behavior has never been observed for C_<60> peapods.
TEM images and electron energy loss spectra suggested that the metallofullerenes can be spaced regularly as close as 1.1 nm in a high-density 'peapod' structure, while 1.1-3 nm spacing was often observed in a low-density peapod. In the present Gd@C_<82> peapod samples, about 10% of over 200 SWNT images showed locally modified semiconducting band gaps.
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[Publications] R.Kumashiro, K.Tanigaki, H.Ohashi, N.Tagmatarchis, H.Kato, H.Shinohara, T.Akasaka, K.Kato, S.Aoyagi, S.Kimura, M.Takata: "Azafullerene (C59N)2 Thin Film Field Effect Transistors"Appl.Phys.Lett.. 84. 2412-2414 (2004)
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[Publications] T.Shimada, Y.Ohno, T.Okazaki, T.Sugai, K.Suenaga, S.Kishimoto, T.Mizutani, T.Inoue, R.Taniguchi, N.Fukui, H.Okubo, H.Shinohara: "Transport Properties of C_<78>, C_<90> and Dy@C_<82> Fullerenes-Nanopeapods by Field-Effect Transistors"Physica E. 21. 1089-1092 (2004)
Description
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