Covalent Metal-Nanotube Heterojunctions as Ultimate Nano-Contacts

Rodriguez-Manzo, Jose; Banhart, Florian; Terrones Maldonado, Mauricio; Terrones Maldonado, Humberto; Grobert, Nicole; Ajayan, Pullikel M.; Sumpter, Bobby G.; Meunier, Vincent

doi:10.1073/pnas.0900960106

Title: Covalent Metal-Nanotube Heterojunctions as Ultimate Nano-Contacts

Journal Article · Sun Feb 01 00:00:00 EST 2009 · Proceedings of the National Academy of Sciences

DOI:https://doi.org/10.1073/pnas.0900960106· OSTI ID:953182

Rodriguez-Manzo, Jose ^[1]; Banhart, Florian ^[1]; Terrones Maldonado, Mauricio ^[2]; Terrones Maldonado, Humberto ^[2]; Grobert, Nicole ^[3]; Ajayan, Pullikel M. ^[4];

^[2]; Meunier, Vincent ^[2]

University of Strasbourg, France
ORNL
University of Oxford, UK
Rice University

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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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 953182

Journal Information:: Proceedings of the National Academy of Sciences, Vol. 106, Issue N/A; ISSN 0027-8424

Country of Publication:: United States

Language:: English

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Title: Covalent Metal-Nanotube Heterojunctions as Ultimate Nano-Contacts

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