In-situ electron irradiation studies of metal-carbon nanostructures

Sun, Litao; Gan, Yang; Rodríguez–Manzo, Julio A.; Terrones, Mauricio; Krasheninnikov, Arkady V.; Banhart, F.

doi:10.1007/978-3-540-85226-1_61

Cited by 29 publications

(38 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It may be noted that there is a huge difference in the values of ␣; the ratio of ␣ Ni / ␣ C as reported in the literature is 16, where ␣ C is the radial thermal expansion coefficient of the nanotubes. Our preliminary calculations show that the stress generated at the interface of graphite and nickel is of the order 100 GPa and compares favorably to the recently reported value of 40 GPa by Sun et al 22 Thus, the high pressure onto the nickel core resulted from different thermal expansion coefficients between the tube walls and the core and/or interface melting. The resultant shear stress at the interface causes the twisting of the nanorod inside the carbon nanotube and generates torsional buckling along the length of the tube.…”

Section: Discussionsupporting

confidence: 89%

Axial buckling and compressive behavior of nickel-encapsulated multiwalled carbon nanotubes

et al. 2007

View full text Add to dashboard Cite

Section: Discussionsupporting

confidence: 89%

Axial buckling and compressive behavior of nickel-encapsulated multiwalled carbon nanotubes

et al. 2007

View full text Add to dashboard Cite

“…The self compression and dynamic behavior of encapsulated material inside graphitic networks, such as a carbon onion or MWCNTs, have been the subject of recent investigations. [12,13] It has been shown that under electron beam irradiation, high internal pressure and temperature caused local phase modification and shape changes of the metallic particles trapped inside the core.…”

Section: à2mentioning

confidence: 99%

Sharp Carbon‐Nanotube Tips and Carbon‐Nanotube Soldering Irons

Misra¹,

Daraio²

2009

Advanced Materials

View full text Add to dashboard Cite

We report on the nano-electron beam assisted fabrication of atomically sharp iron-based tips and on the creation of a nano-soldering iron for nano-interconnects using Fe-filled multiwalled carbon nanotubes (MWCNTs). High energy electron beam machining has been proven a powerful tool to modify desired nanostructures for technological applications (1-4) and to form molecular junctions and interconnections between carbon nanotubes (2, 5). Recent studies (5) showed the high degree of complexity in the creation of direct interconnections between multiwalled and CNTs having dissimilar diameters. Our

show abstract

“…We believe that such difference is mainly caused by the different configuration of a source CNT and a metal catalyst. CNTs have already been shown to impose high pressure on an encapsulated metal under electron irradiation, [15] the sprout of CNT from the end of the supersaturated metal particle inside the host CNT is therefore strongly favored. However, in the case of the present end-to-end configuration, when the C atoms start to segregate on the supersaturated W, there is no such pressure governing and directing the process of C shell crystallization.…”

mentioning

confidence: 99%

Interface Dynamic Behavior Between a Carbon Nanotube and Metal Electrode

2009

View full text Add to dashboard Cite

The heterointerface between a carbon nanotube (CNT) and a metal is of prime importance for CNT-based nanotechnology.[1] In nanoelectronic circuits, the behavior of every single CNT-based device is highly influenced by the atomic and electronic structures of the contact interface between a nanotube and an electrode. Ohmic CNT/metal contacts of high conductivity are usually prerequisite for the effective performance of an individual device, as well as their interconnections.[2] On the other hand, controlled synthesis of CNTs with desired structures is a crucial step for nanotube integration into nanotechnology. This requires a detailed understanding of the growth mechanism, especially the interactions between C atoms and a catalyst particle at the CNT/metal interface during the catalyst-assisted syntheses. Several hypotheses based on theoretical simulations, [3] postgrowth, or in situ experimental observations [4][5][6][7][8] have been proposed in an attempt to describe catalyzed chemical vapor deposition (CVD). However, some crucial questions related to a CNT/catalyst interface still remain controversial. For example, do C atoms migrate on a metal surface (or metal/graphitic shell interface), [3,5] or diffuse through the body of a catalyst particle? [7,8] Does a metal catalyst convert to an intermediate metal carbide [4,7,8] before segregation of graphitic layers on the catalyst surface? Does a catalyst particle exist in a solid or liquid state during the nanotube growth? Further investigations of a CNT/ metal interface by in situ high-spatial-resolution techniques are required for clarifying these issues. Such studies would also be desirable for the development of new CNT/metal contact designs and schemes that enable robust electrical and mechanical connection between a CNT and a metal electrode.In the present study, a CNT/metal interface was created by connecting an individual multi-walled CNT and a sharp tungsten nanoelectrode inside a high-resolution transmission electron microscope (HRTEM). The details of the interface structural transformations induced by a high current flow and Joule heating were monitored under high spatial resolution (1.7 Å for the microscope used), and the corresponding electrical properties were examined by two-terminal measurements. This in situ study not only brings deeper understanding of the catalytic CNT growth mechanisms and the processes at the CNT/metal electrode interfaces during the current flows, but also attains novel CNT-carbide-metal nanojunctions that exhibit excellent electronic properties and mechanical robustness. Furthermore, unusual CNT wall-thickness changes were demonstrated via preferential fast absorption of CNT core shells into a tungsten electrode.All experiments were carried out in a JEM-3100FEF (JEOL) TEM using a ''Nanofactory Instruments AB'' STM-TEM holder. [9,10] As shown in the schematics of Figure 1, a multiwalled CNT protruding from the edge of a gold wire was approached to a W tip that was delicately driven by a piezo-tube. After the end-to-end physica...

show abstract

In-situ electron irradiation studies of metal-carbon nanostructures

Cited by 29 publications

References 4 publications

Axial buckling and compressive behavior of nickel-encapsulated multiwalled carbon nanotubes

Axial buckling and compressive behavior of nickel-encapsulated multiwalled carbon nanotubes

Sharp Carbon‐Nanotube Tips and Carbon‐Nanotube Soldering Irons

Interface Dynamic Behavior Between a Carbon Nanotube and Metal Electrode

Contact Info

Product

Resources

About