Macroscopic effects of tunnelling barriers in aggregates of carbon nanotube bundles

Salvato, M.; Cirillo, M.; Lucci, M.; Orlanducci, S.; Ottaviani, I.; Terranova, Maria Letizia; Toschi, F.

doi:10.1088/0022-3727/45/10/105306

Cited by 6 publications

(4 citation statements)

References 23 publications

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“…We can also see that an ohmic-non-ohmic transition is present in both the samples but at different currents. It is worth noting that Joule heating effects can be ruled out for these measurements as the cause of the ohmic-non-ohmic transition as demonstrated for other samples with similar characteristics [11]. In order to avoid any effect due to current, we analyse our samples in the ohmic region.…”

Section: Resistance Versus Temperature: Results and Fittingsmentioning

confidence: 99%

Low temperature conductivity of carbon nanotube aggregates

Salvato

Lucci

Ottaviani

et al. 2011

J. Phys.: Condens. Matter

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We compare, over wide temperature ranges, the transport properties of single-wall carbon nanotubes arranged in the form of aligned arrays or in the form of fibres. The experimental data show that both the forms of aggregates present a crossover in the transport mechanism from three-dimensional hopping of the electrons between localized states at high temperature to fluctuation-induced tunnelling across potential barriers at low temperature. The role of the junctions formed between the bundles in the array and between the nanotubes inside the fibres is discussed on the basis of the experimental results.

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Section: Resistance Versus Temperature: Results and Fittingsmentioning

confidence: 99%

Low temperature conductivity of carbon nanotube aggregates

Salvato

Lucci

Ottaviani

et al. 2011

J. Phys.: Condens. Matter

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“…We report in figure 2c the curve measured at low temperature (4.2 K) for the first sample, and it is compared to the room temperature characteristic. Such non-ohmic behavior of the I-V characteristic has been observed at low temperature in SWCNT network [37,49,50] and explained by developing an electrical model that considers series-parallel connections of junctions existing in the CNT bundles [50].…”

Section: Electrical Characterizationmentioning

confidence: 95%

Transport and field emission properties of buckypapers obtained from aligned carbon nanotubes

Giubileo¹,

Iemmo

Luongo

et al. 2017

J Mater Sci

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We produce 120-µm-thick buckypapers from aligned carbon nanotubes. Transport characteristics evidence ohmic behavior in a wide temperature range nonlinearity appearing in the current–voltage curves only close to 4.2 K. The temperature dependence of the conductance shows that transport is mostly due to thermal fluctuation-induced tunneling, although to explain the whole temperature range from 4.2 to 430 K a further linear contribution is necessary. The field emission properties are measured by means of a nano-controlled metallic tip acting as collector electrode to access local information about buckypaper properties from areas as small as 1 µm2. Emitted current up to 10−5 A and turn-on field of about 140 V/µm are recorded. Long operation, stability and robustness of emitters have been probed by field emission intensity monitoring for more than 12 h at pressure of 10−6 mbar. Finally, no tuning of the emitted current was observed for in-plane applied currents in the buckypaper

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“…Therefore, knowledge of electric-field-dependent properties of SWCNT networks is required for the sake of possible potential applications. Previous investigations of carrier transport in CNT structures have been performed [14][15][16] only within limits of moderate electric field strength (up to 100-1000 V/cm) in order to avoid Joule heating of CNT layers. On the other hand, isolated SWCNTs were subjected to heating by stronger electric fields.…”

Section: Introductionmentioning

confidence: 99%

Electrical conductivity of single-wall carbon nanotube films in strong electric field

Seliuta

Subačius

Kašalynas

et al. 2013

Journal of Applied Physics

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Carrier transport features in single-wall carbon nanotube (SWCNT) films under strong electric fields (up to 10 5 V/cm) are presented. Application of electrical pulses of nanosecond duration allowed to minimize Joule heating and resolve intrinsic nonlinearities with the electric field. Investigations within a wide range of temperatures-4.2-300 K-indicated that carrier localization as well as tunneling through the insulating barriers between conducting regions takes place in SWCNT films. Crossover from semiconducting behavior to metallic behavior in strong electric field is described using the fluctuation induced tunneling model and assuming that the conducting regions demonstrate characteristic metallic conductivity. V

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Macroscopic effects of tunnelling barriers in aggregates of carbon nanotube bundles

Cited by 6 publications

References 23 publications

Low temperature conductivity of carbon nanotube aggregates

Low temperature conductivity of carbon nanotube aggregates

Transport and field emission properties of buckypapers obtained from aligned carbon nanotubes

Electrical conductivity of single-wall carbon nanotube films in strong electric field

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