Controlled growth and electrical properties of heterojunctions of carbon nanotubes and silicon nanowires

Hu, Jiangtao; Ouyang, Min; Yang, Peidong; Lieber, Charles M.

doi:10.1038/19941

Cited by 726 publications

(413 citation statements)

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“…For creating devices at the nanoscale, different structures have to be joined so as to obtain junctions with predefined properties. Junctions between carbon nanotubes (CNTs) and metals (1)(2)(3) or semiconducting (1,4) nanowires are highly desirable to exploit the excellent electronic and mechanical properties of CNTs. In electronic devices, conductive contacts between the graphitic network of CNTs and metallic electrodes need to be established to link the nanotubes with each other and their periphery.…”

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confidence: 99%

Heterojunctions between metals and carbon nanotubes as ultimate nanocontacts

Rodríguez–Manzo

Banhart

Terrones

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

111

100

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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.nanoelectronics ͉ interfacial interactions ͉ conductivity ͉ electron microscopy ͉ composites H eterojunctions between different materials are of increasing interest in nanotechnology. For creating devices at the nanoscale, different structures have to be joined so as to obtain junctions with predefined properties. Junctions between carbon nanotubes (CNTs) and metals (1-3) or semiconducting (1, 4) nanowires are highly desirable to exploit the excellent electronic and mechanical properties of CNTs. In electronic devices, conductive contacts between the graphitic network of CNTs and metallic electrodes need to be established to link the nanotubes with each other and their periphery. To date, most results indicate that the properties of such a device are dominated by the electronic behavior at the nanotube-metal contact. For instance, the resistance of the ohmic contact (1, 3, 5) or Schottky barrier effects (6) are influenced by the type of interface between metal and the graphitic structure. In some previous studies, multiwall carbon nanotube (MWNTs) interconnections with metal electrodes only occurred with the outermost wall of MWNTs (7). A robust mechanical connection in such a junction cannot be expected, nor can the inner walls of MWNTs participate considerably in charge transport (5). Therefore, detailed knowledge regarding the nature and strength of bonding as well as the morphology and electrical properties of contacts is important because it is vital to connect all concentric cylinders of a MWNT, across the entire cross-section of the nanotube, to a metal particle. In particular, a covalent nanotube-metal junction would allow one to attach nanotubes firmly to metal pieces, which is useful for achieving well-defined electrical contacts and also for attaching nanotubes firmly to metal supports for the realization of ultrastrong nanotube ropes in mechanical systems.Recent studies have reported examples of graphitic material interfaces with metal particles for Co crysta...

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mentioning

confidence: 99%

Heterojunctions between metals and carbon nanotubes as ultimate nanocontacts

Rodríguez–Manzo

Banhart

Terrones

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

111

100

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“…The pair was granted a patent for metal oxide nanorods in 1999 (2), and by the time Yang graduated from Harvard, he and Lieber had successfully grown junctions between silicon nanowires and carbon nanotubes (3).…”

Section: Education In Chinamentioning

confidence: 99%

Profile of Peidong Yang

Gabrielsen¹

2017

Proc. Natl. Acad. Sci. U.S.A.

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“…Recently, such techniques have been applied to nanotubes in the context of an investigation of the electrical response of strained carbon nanotubes [26]. We note that nanotube-based quantum dots have also been obtained using a nanotube/SiC nanorod interface [27]. However, in contrast to this and other methods based on chemical functionalization, the approach proposed here has the advantage of producing pure all-carbon-based heterojunctions with a controlled geometry.…”

Section: (Received 12 January 1999)mentioning

confidence: 99%

Ad-dimers on Strained Carbon Nanotubes: A New Route for Quantum Dot Formation?

et al. 1999

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The presence of ad-dimers on carbon nanotubes under tension leads to the formation of defects that wrap themselves around the circumference of the nanotube. These defects are actually short segments of a tube with a changed helicity, which suggests that the combination of ad-dimers plus strain can be used to form nanotube-based quantum dots. Our classical molecular dynamics and tight binding simulations show that the formation of such structures is particularly clean and promising for the ͑n, 0͒ zigzag tubes, where the presence of ad-dimers induces plastic transformations on what are otherwise brittle tubes.

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Controlled growth and electrical properties of heterojunctions of carbon nanotubes and silicon nanowires

Cited by 726 publications

References 15 publications

Heterojunctions between metals and carbon nanotubes as ultimate nanocontacts

Heterojunctions between metals and carbon nanotubes as ultimate nanocontacts

Profile of Peidong Yang

Ad-dimers on Strained Carbon Nanotubes: A New Route for Quantum Dot Formation?

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