Barrier Modification at Contacts between Carbon Nanotube and Pt Electrode Using Well-Controlled Joule Heating

Yoshikawa, Yuya; Akita, Seiji; Nakayama, Yoshikazu

doi:10.1143/jjap.46.l359

Cited by 8 publications

(14 citation statements)

References 12 publications

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“…Previous studies in metal-carbon nanotube contacts fabricated by EBID presented similar features, which were associated to a combination of tunneling and ohmic resistances. 19 However, as in the case for nanotubes, further studies are required to identify the precise nature of our FM/aC/graphene contacts.…”

mentioning

confidence: 99%

“…The transport properties of metal/aC/graphene interfaces have not been studied, much less its spin transfer properties. However, previous demonstrations 19 of improved metal-nanotube contacts using electron-beam induced deposition (EBID) of aC and the fact that carbon is a light material, which may introduce relatively low spin dephasing, make aC an excellent candidate for spintronic applications. Indeed, we demonstrate a 2 10 4 -fold enhancement of the spin signal in graphene lateral spin valves following EBID of aC interfacial layers.…”

mentioning

confidence: 99%

“…This process is well established 22 and has been used, for example, to fabricate complex carbon structures, 23 conducting bridges, 24 and contacts with carbon nanotubes. 19 Carbon precursors can either be introduced externally using a gas source or simply be present as residual hydrocarbons at the background pressure of a scanning electron microscope (SEM) chamber. 22 Carbon deposition from residual hydrocarbons onto graphene was recently demonstrated by direct visualization in a transmission electron microscope.…”

mentioning

confidence: 99%

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Enhanced spin accumulation at room temperature in graphene spin valves with amorphous carbon interfacial layers

Neumann

Costache

Bridoux

et al. 2013

Applied Physics Letters

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We demonstrate a large enhancement of the spin accumulation in monolayer graphene following electron-beam induced deposition of an amorphous carbon layer at the ferromagnet-graphene interface. The enhancement is 10 4 -fold when graphene is deposited onto poly(methyl metacrylate) (PMMA) and exposed with sufficient electron-beam dose to cross-link the PMMA, and 10 3 -fold when graphene is deposited directly onto SiO 2 and exposed with identical dose. We attribute the difference to a more efficient carbon deposition in the former case due to an increase in the presence of compounds containing carbon, which are released by the PMMA. The amorphous carbon interface can sustain very large current densities without degrading, which leads to very large spin accumulations exceeding 500 µeV at room temperature.

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Enhanced spin accumulation at room temperature in graphene spin valves with amorphous carbon interfacial layers

Neumann

Costache

Bridoux

et al. 2013

Applied Physics Letters

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“…Thus, according to the current change in the breakdown of the bifurcated MWCNT bundle in the Figure 3 , the Figure 4 shows the resistance circuit model without considering the capacitance and inductance [ 15 , 30 , 46 ]. Additionally, each carbon shell can be regarded as a single resistance.…”

Section: Resultsmentioning

confidence: 99%

Electrical Conductivity of Multiwall Carbon Nanotube Bundles Contacting with Metal Electrodes by Nano Manipulators inside SEM

Yang

Xiao

et al. 2021

Nanomaterials

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Determining the metallicity and semiconductivity of a multi-walled carbon nanotube (MWCNT) bundle plays a particularly vital role in its interconnection with the metal electrode of an integrated circuit. In this paper, an effective method is proposed to determine the electrical transport properties of an MWCNT bundle using a current–voltage characteristic curve during its electrical breakdown. We established the reliable electrical nanoscale contact between the MWCNT bundle and metal electrode using a robotic manipulation system under scanning electron microscope (SEM) vacuum conditions. The experimental results show that the current–voltage curve appears as saw-tooth-like current changes including up and down steps, which signify the conductance and breakdown of carbon shells in the MWCNT bundle, respectively. Additionally, the power law nonlinear behavior of the current–voltage curve indicates that the MWCNT bundle is semiconducting. The molecular dynamics simulation explains that the electron transport between the inner carbon shells, between the outermost carbon shells and gold metal electrode and between the outermost carbons shells of two adjacent individual three-walled carbon nanotubes (TWCNTs) is through their radial deformation. Density functional theory (DFT) calculations elucidate the electron transport mechanism between the gold surface and double-wall carbon nanotube (DWCNT) and between the inner and outermost carbon shells of DWCNT using the charge density difference, electrostatic potential and partial density of states.

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“…During deposition, a dc voltage was applied between these two stages to improve the electrical contact between the CNT and the AFM probe tip. 23,24) Then a resistor of 500 k was inserted in the circuit to regulate the electrical current. After deposition, the dc voltage and the resistor were toggled to an exponential decay pulse generator.…”

Section: Fabrication Of Cnt Tipsmentioning

confidence: 99%

Distinct Chemical Contrast in Adhesion Force Images of Hydrophobic–Hydrophilic Patterned Surfaces Using Multiwalled Carbon Nanotube Probe Tips

Azehara

Kasanuma

Ide

et al. 2008

jjap

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In this paper, we describe a fabrication procedure for large-diameter carbon nanotube probe tips (CNT tips) for atomic force microscopy, the tip-end chemistry of the CNT tips, and their advantage drawn from the study of adhesion force imaging in an ambient atmosphere on a patterned hydrophobic and hydrophilic self-assembled monolayer, which has been prepared by a microcontact printing method. Force titration measurements in phosphate buffer solutions reveal that the CNT tip has retained carboxyl groups at its end. In adhesion force imaging, a distinct chemical contrast is obtained for the patterned surfaces as compared to a case using a silicon nitride tip. The origin of the distinct contrast is discussed in terms of the tip-end chemistry featured by carboxyl groups and a possible weakening of capillary forces of water caused at around the tip-sample interface because of the intrinsically hydrophobic nature of CNTs.

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Barrier Modification at Contacts between Carbon Nanotube and Pt Electrode Using Well-Controlled Joule Heating

Cited by 8 publications

References 12 publications

Enhanced spin accumulation at room temperature in graphene spin valves with amorphous carbon interfacial layers

Enhanced spin accumulation at room temperature in graphene spin valves with amorphous carbon interfacial layers

Electrical Conductivity of Multiwall Carbon Nanotube Bundles Contacting with Metal Electrodes by Nano Manipulators inside SEM

Distinct Chemical Contrast in Adhesion Force Images of Hydrophobic–Hydrophilic Patterned Surfaces Using Multiwalled Carbon Nanotube Probe Tips

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