Electronic structure and charge distribution of potassium iodide intercalated single-walled carbon nanotubes

Yam, ChiYung; Ma, Chi-Chiu; Wang, XiuJun; Chen, Guanhua

doi:10.1063/1.1819510

Cited by 22 publications

(23 citation statements)

References 14 publications

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“…Further, electron depletion in metallic nanotubes is always related to longitudinal contraction. 19 Density functional theory calculations of KI encapsulation in a larger (d t > d t optimum ), (10, 10) nanotube have shown that the electronic density of the nanotube wall can indeed decrease after filling, 34 consistent with our findings. Note that ref 34 found the chargetransfer process in this system to be quite complex, as on the other hand, the electronic density in the nanotube-filling interspace was found to increase.…”

Section: High-energy Vibrational Modessupporting

confidence: 92%

Effects of KI Encapsulation in Single-Walled Carbon Nanotubes by Raman and Optical Absorption Spectroscopy

et al. 2006

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The effect of KI encapsulation in narrow (HiPCO) single-walled carbon nanotubes is studied via Raman spectroscopy and optical absorption. The analysis of the data explores the interplay between strain and structural modifications, bond-length changes, charge transfer, and electronic density of states. KI encapsulation appears to be consistent with both charge transfer and strain that shrink both the C-C bonds and the overall nanotube along the axial direction. The charge transfer in larger semiconducting nanotubes is low and comparable with some cases of electrochemical doping, while optical transitions between pairs of singularities of the density of states are quenched for narrow metallic nanotubes. Stronger changes in the density of states occur in some energy ranges and are attributed to polarization van der Waals interactions caused by the ionic encapsulate. Unlike doping with other species, such as atoms and small molecules, encapsulation of inorganic compounds via the molten-phase route provides stable effects due to maximal occupation of the nanotube inner space.

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Section: High-energy Vibrational Modessupporting

confidence: 92%

Effects of KI Encapsulation in Single-Walled Carbon Nanotubes by Raman and Optical Absorption Spectroscopy

et al. 2006

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“…12 A lot of nanomaterials have been fabricated by means of filling CNTs. 13 Much research work has been done to study the metallic nanowires. For example, the structures of ultrathin copper nanowires encapsulated in carbon nanotubes have been carried out by Choi et al 14 The structues and magnetic properties of iron encapsulated in the single-wall carbon nanotubes have also been studied.…”

Section: Introductionmentioning

confidence: 99%

The structures and electrical transport properties of germanium nanowires encapsulated in carbon nanotubes

Zhang

Liew

2007

Journal of Applied Physics

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The structures of Ge nanowires are studied by means of geometry optimization method in this paper. As the radii of carbon nanotubes increase, the structures of the Ge nanowires transform from a monoatomic chain to helical and multishell coaxial cylinders. The physical properties, such as density of states, transmission functions, current-voltage (I-V) characteristics, and conductance spectra (G-V) of optimized nanowires sandwiched between two gold contacts are also obtained. The transport properties of a carbon-coated Ge atomic chain are significantly different from those of Ge single atomic chain. Furthermore, some nonequilibrium properties of Ge nanowires are compared with those of Sn and Si nanowires.

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“…Atoms or molecules could be further intercalated into carbon nanotubes. [12][13][14][15][16] In this work, we mainly focus on electronic and optical properties of zigzag double-walled carbon nanotubes ͑DWCNTs͒. The effects due to the intertube interactions, the magnetic field, and the Zeeman splitting are investigated.…”

Section: Introductionmentioning

confidence: 99%

Band structures of double-walled carbon nanotubes

et al. 2006

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

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The tight-binding model is used to investigate band structures of zigzag double-walled carbon nanotubes. The intertube interactions significantly change symmetry of energy bands, energy dispersions, Fermi energy, energy gap, and wave functions. Electronic properties are also affected by the magnetic flux and the Zeeman effect. The main features of band structures are directly reflected in optical absorption spectra, such as the blueshift of absorption frequency, the increase of absorption peaks, and the enhancement of spectral intensity. There are certain important differences between zigzag and armchair double-walled systems.

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Electronic structure and charge distribution of potassium iodide intercalated single-walled carbon nanotubes

Cited by 22 publications

References 14 publications

Effects of KI Encapsulation in Single-Walled Carbon Nanotubes by Raman and Optical Absorption Spectroscopy

Effects of KI Encapsulation in Single-Walled Carbon Nanotubes by Raman and Optical Absorption Spectroscopy

The structures and electrical transport properties of germanium nanowires encapsulated in carbon nanotubes

Band structures of double-walled carbon nanotubes

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