期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 106, 期 12, 页码 4591-4595出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0900960106
关键词
nanoelectronics; interfacial interactions; conductivity; electron microscopy; composites
资金
- Deutsche Forschungsgemeinschaft [1884/6-1]
- CONACYT-Mexico [56787, 45762, 45772]
- Inter American Collaboration [58899]
- Fondo Mixto de San Luis Potosi [63001 S-3908, 63072 S-3909]
- SALUD-CONACYT [2004-01-013]
- Royal Society
- National Science Foundation [DMR-0801012]
- Division of Scientific User Facilities, U. S. Department of Energy
- Division of Materials Science and Engineering
- World Premier International Center
- National Institute for Materials Science, Tsukuba, Japan
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0801012] Funding Source: National Science Foundation
We report the controlled formation and characterization of heterojunctions between carbon nanotubes and different metal nanocrystals (Fe, Co, Ni, and FeCo). The heterojunctions are formed from metal-filled multiwall carbon nanotubes (MWNTs) via intense electron beam irradiation at temperatures in the range of 450-700 C and observed in situ in a transmission electron microscope. Under irradiation, the segregation of metal and carbon atoms occurs, leading to the formation of heterojunctions between metal and graphite. Metallic conductivity of the metal-nanotube junctions was found by using in situ transport measurements in an electron microscope. Density functional calculations show that these structures are mechanically strong, the bonding at the interface is covalent, and the electronic states at and around the Fermi level are delocalized across the entire system. These properties are essential for the application of such heterojunctions as contacts in electronic devices and vital for the fabrication of robust nanotube-metal composite materials.
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