Metal nanoring and tube formation on carbon nanotubes

Bagci, V. M. K.; Gülseren, Oğuz; Yildirim, Taner; Gedik, Zafer; Çiraci, S.

doi:10.1103/physrevb.66.045409

Cited by 34 publications

(38 citation statements)

References 28 publications

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“…In principle, chiral current passing through a one-micron (5, 3) SWNT can induce magnetic fields of several Tesla [19]. According to Altshuler-Aronov-Spivak effect [20] electrons circling a cylindrical conductor that encloses a magnetic flux Φ give rise to a periodic oscillating resistance as a function of Φ.…”

Section: Figmentioning

confidence: 99%

Chiral Single-Wall Gold Nanotubes

2004

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Based on first-principles calculations we show that gold atoms can form both free-standing and tipsuspended chiral single-wall nanotubes composed of helical atomic strands. Free-standing, infinite (5,5) tube is found to be energetically the most favorable. While energetically less favorable, the experimentally observed (5,3) tube stretching between two tips corresponds to a local minimum in the string tension. Similarly, the (4,3) tube is predicted as a favorable structure yet to be observed experimentally. Analysis of band structure, charge density, and quantum ballistic conductance suggests that the current on these wires is less chiral than expected, and there is no direct correlation between the numbers of conduction channels and helical strands.

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Section: Figmentioning

confidence: 99%

Chiral Single-Wall Gold Nanotubes

2004

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“…11 We also note that in forming a good coverage not only adatom-SWNT interaction but also other factors, possibly adatom-adatom interaction, play a crucial role. 17 Good conductors such as Au, Ag, and Cu have very weak binding. However, Na with one 3s electron on the outer shell is bound with a significant binding energy (E b ) 1.3 eV).…”

Section: Binding Geometries and Energiesmentioning

confidence: 99%

“…It is argued that either persistent currents through these conducting nanorings or conversely very high magnetic fields can be induced at their center. 17 Such a setup has been also proposed as possible qubits in quantum computation. 18 It has been shown experimentally that the implementation of iron atoms inside the tube can give rise to magnetization.…”

Section: Introductionmentioning

confidence: 99%

“…13 The formation of a Schottky barrier at the contact has been found to be responsible for the operation of field-emission transistors made from SWNTs. [14][15][16] Theoretical studies 17 have indicated that stable rings and tubes of Al atoms can form around a semiconducting SWNT. It is argued that either persistent currents through these conducting nanorings or conversely very high magnetic fields can be induced at their center.…”

Section: Introductionmentioning

confidence: 99%

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Energetics and Electronic Structures of Individual Atoms Adsorbed on Carbon Nanotubes

et al. 2003

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The adsorption of individual atoms on the semiconducting and metallic single-walled carbon nanotubes (SWNT) has been investigated by using the first principles pseudopotential plane wave method within density functional theory. The stable adsorption geometries and binding energies have been determined for a large number of foreign atoms ranging from alkali and simple metals to the transition metals and group IV elements. We have found that the character of the bonding and associated physical properties strongly depends on the type of adsorbed atoms, in particular, on their valence electron structure. Our results indicate that the properties of SWNTs can be modified by the adsorbed foreign atoms. Although the atoms of good conducting metals, such as Zn, Cu, Ag, and Au, form very weak bonds, transition-metal atoms such as Ti, Sc, Nb, and Ta and group IV elements C and Si are adsorbed with a relatively high binding energy. Owing to the curvature effect, these binding energies are larger than the binding energies of the same atoms on the graphite surface. We have showed that the adatom carbon can form strong and directional bonds between two SWNTs. These connects can be used to produce nanotube networks or grids. Most of the adsorbed transition-metal atoms excluding Ni, Pd, and Pt have a magnetic ground state with a significant magnetic moment. Our results suggest that carbon nanotubes can be functionalized in different ways by their coverage with different atoms, showing interesting applications such as 1D nanomagnets or nanoconductors, conducting connects, and so forth.

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“…[1][2][3] There are many kinds of 1D nanostructures such as nano-belts, 4 nanoneedles, 5 nanorods, 6 nanorings, 7 nanowires, 8 nanotubes, 9 and nanofibers. 10 These materials can be produced using various methods such as the sol-gel process, 11 sputtering, 12 spray pyrolysis, 13 hydrothermal, 14 electrospinning, 15,16 and electrochemical deposition.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Thermal Oxidation of ZnO Nanofibers Prepared via Electrospinning Technique

Baek¹,

Park²,

Kang³

et al. 2012

Bulletin of the Korean Chemical Society

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Materials on the scale of nanoscale have widely been used as research topics because of their interesting characteristics and aspects they bring into the field. Out of the many metal oxides, zinc oxide (ZnO) was chosen to be fabricated as nanofibers using the electrospinning method for potential uses of solar cells and sensors. After ZnO nanofibers were obtained, calcination temperature effects on the ZnO nanofibers were studied and reported here. The results of scanning electron microscopy (SEM) revealed that the aggregation of the ZnO nanofibers progressed by calcination. X-ray diffraction (XRD) study showed the hcp ZnO structure was enhanced by calcination at 873 and 1173 K. Transmission electron microscopy (TEM) confirmed the crystallinity of the calcined ZnO nanofibers. X-ray photoelectron spectroscopy (XPS) verified the thermal oxidation of Zn species by calcination in the nanofibers. These techniques have helped us deduce the facts that the diameter of ZnO increases as the calcination temperature was raised; the process of calcination affects the crystallinity of ZnO nanofibers, and the thermal oxidation of Zn species was observed as the calcination temperature was raised.

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Metal nanoring and tube formation on carbon nanotubes

Cited by 34 publications

References 28 publications

Chiral Single-Wall Gold Nanotubes

Chiral Single-Wall Gold Nanotubes

Energetics and Electronic Structures of Individual Atoms Adsorbed on Carbon Nanotubes

Fabrication and Thermal Oxidation of ZnO Nanofibers Prepared via Electrospinning Technique

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