Electrical conductivity of a single parallel contact between carbon nanotubes

Hamasaki, Hidehisa; Nagahama, Sougo; Hirahara, Kaori

doi:10.1039/d2nr04112j

Cited by 4 publications

(6 citation statements)

References 26 publications

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“…Given that ρ, L , and d in were constant, L = 360 nm, and d in = 3.6 nm (obtained via TEM imaging), we derived ρ from the difference between two measurement points (difference between the values of R measured for two different values of d out ), as the unknown parameter ( R 0 ) was canceled. The estimated electrical resistivity (ρ) was ∼6 × 10 –6 Ω·m (σ ≈ 2 × 10 5 S/m) for the MWCNT shown in Figure , which showed good agreement with a previously reported value . The dashed line in Figure (d) represents eq for ρ = 6.3 × 10 –6 Ω·m.…”

Section: Resultssupporting

confidence: 90%

“…The estimated electrical resistivity (ρ) was ∼6 × 10 −6 Ω•m (σ ≈ 2 × 10 5 S/m) for the MWCNT shown in Figure 3, which showed good agreement with a previously reported value. 23 The dashed line in Figure 3(d) represents eq 1 for ρ = 6.3 × 10 −6 Ω•m. The good agreement with the experimental data supported the validity of the diameter-independent electrical resistivity of MWCNTs.…”

Section: Resultsmentioning

confidence: 99%

“…The almost linear change in electrical resistance shown in Figure 4(d) was attributed to the change in the MWCNT length, suggesting that interfacial resistance was not dominant for this contact length. 23 The different behaviors of thermal and electrical transport based on the contact length implied that thermal transport was more strongly hindered at the interface compared with electrical transport. This difference between the thermal and electrical resistances at the interface could explain the detection of isotropic thermoelectric power and anisotropic electrical conductivity in a well-aligned CNT film in a previous study.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, the electrical transport properties of single CNTs and interfaces have been investigated using in situ transmission electron microscopy (TEM). 23 In this study, we adopted a similar approach to measure the thermoelectric power of isolated multiwalled CNTs (MWCNTs) and single interfaces. Furthermore, we investigated the impact of the interfacial thermoelectric power by systematically changing the length of contact between two CNTs for in situ thermoelectric measurements using TEM.…”

mentioning

confidence: 99%

“…Therefore, experimentation at the single-material level is crucial for clarifying the impact of interfacial thermoelectric power. Recently, the electrical transport properties of single CNTs and interfaces have been investigated using in situ transmission electron microscopy (TEM) . In this study, we adopted a similar approach to measure the thermoelectric power of isolated multiwalled CNTs (MWCNTs) and single interfaces.…”

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confidence: 99%

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Thermoelectric Power of a Single van der Waals Interface between Carbon Nanotubes

Hamasaki,

Li,

Ohnishi

et al. 2023

ACS Nano

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Control of van der Waals interfaces is crucial for fabrication of nanomaterial-based high-performance thermoelectric devices because such interfaces significantly affect the overall thermoelectric performances of the device due to their relatively high thermal resistance. Such interfaces could induce different thermoelectric power from the bulk, i.e., interfacial thermoelectric power. However, from a macroscopic point of view, a correct evaluation of the interfacial thermoelectric power is difficult owing to various interface configurations. Therefore, the study of the thermoelectric properties at a single interface is crucial to address this problem. Herein, we used in situ transmission electron microscopy and nanomanipulation to investigate the thermoelectric properties of carbon nanotubes and their interfaces. The thermoelectric power of the bridged carbon nanotubes was individually measured. The existence of the interfacial thermoelectric power was determined by systematically changing the contact size between the two parallel nanotubes. The effect of interfacial thermoelectric power was qualitatively supported by Green’s function calculations. When the contact length between two parallel nanotubes was less than approximately 100 nm, the experimental results and theoretical calculations indicated that the interface significantly contributed to the total thermoelectric power. However, when the contact length was longer than approximately 200 nm, the total thermoelectric power converged to the value of a single nanotube. The findings herein provide a basis for investigating thermoelectric devices with controlled van der Waals interfaces and contribute to thermal management in nanoscale devices and electronics.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Thermoelectric Power of a Single van der Waals Interface between Carbon Nanotubes

Hamasaki,

Li,

Ohnishi

et al. 2023

ACS Nano

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NO2 gas response and recovery properties of ambipolar CNT-FETs with various CNT/CNT junctions

Inaba,

Yagi,

Asano

et al. 2024

AIP Advances

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Gas sensors based on ambipolar carbon nanotube (CNT) field-effect transistors with various amounts of CNTs were fabricated by dielectrophoretic assembly. The nitrogen dioxide (NO2) gas response and recovery properties of the transistors were measured to investigate the effect of CNT amount on gas response. For the device with a small amount of CNTs, responses from the CNT bulk and CNT/electrode contacts were observed. For devices with a large amount of CNTs, in which a network-like structure of CNTs was observed near the electrodes, an increased current in both electron and hole conduction regions was observed compared with that for the device with a small amount of CNTs. The increased current in the electron conduction region rapidly decreased during recovery. This response is consistent with that of CNT/CNT X-type contacts, which have a high resistance before NO2 adsorption. Equivalent circuits of CNT channels with CNT/CNT contacts were developed, allowing the transistor behavior to be qualitatively discussed. Evaluation of time constants revealed that CNT/electrode contacts and CNT/CNT X-type contacts exhibited high NO2 adsorption and desorption rates, respectively.

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Dose Dependences of Electrical Properties of Multi-Walled Carbon Nanotubes Submonolayer Films Under the High-Energy Electron Irradiation

Pavlenko,

Gaponov,

Dmytrenko

et al. 2024

Preprint

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Electrical conductivity of a single parallel contact between carbon nanotubes

Abstract: In situ measurements of the electrical resistance of a parallel contact between carbon nanotubes were performed. The electrical conductivities of individual nanotubes and the interface were derived by varying the contact length systematically.

Cited by 4 publications

References 26 publications

Thermoelectric Power of a Single van der Waals Interface between Carbon Nanotubes

Thermoelectric Power of a Single van der Waals Interface between Carbon Nanotubes

NO2 gas response and recovery properties of ambipolar CNT-FETs with various CNT/CNT junctions

Dose Dependences of Electrical Properties of Multi-Walled Carbon Nanotubes Submonolayer Films Under the High-Energy Electron Irradiation

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