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Electrical Evidence for the Encapsulation of C60 Inside a Carbon Nanotube: Random Telegraph Signal and Hysteric Current-voltage Characteristics
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- Authors
- Han Young Yu, Dong Su Lee, Ursula Dettlaff-Weglikowska, Siegmar Roth, Yung Woo Park
- Issue Date
- 2008-10
- Citation
- Physical Review B : Condensed Matter and Materials Physics, v.78, no.15, pp.1-5
- ISSN
- 1098-0121
- Publisher
- American Physical Society(APS)
- Language
- English
- Type
- Journal Article
- Abstract
- We present electrical evidence for the encapsulation of C60 's inside a carbon nanotube, random telegraph signals (RTSs), and hysteric current-voltage characteristics. RTSs are shown only at voltages higher than a critical voltage. We suggest that the origin of the RTSs is ascribed to the instability of the quantum harmonic oscillations of C60 's. RTSs are smeared out at a temperature which is well correlated with the energy level of the vibrational quantum mediated by the van der Waals binding between the carbon nanotube and C60 's. In addition, hysteric behavior in cyclic current-voltage characteristics is explained by the longitudinal motion and resettlement of the C60 's with the modulation of the size of the quantum dot mediated by the C60 insertion. © 2008 The American Physical Society.
- KSP Keywords
- Carbon nano-tube(CNT), Critical Voltage, Harmonic oscillations, Longitudinal motion, Quantum Dot(QD), Random telegraph signal, current-voltage characteristics, energy levels, van der Waals