Dielectrophoretically assembled carbon nanotube‐metal hybrid structures with reduced contact resistance

Ranjan, N.; Mertig, Michael

doi:10.1002/pssb.200879582

Cited by 14 publications

(14 citation statements)

References 13 publications

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“…Furthermore, since the dielectrophoresis depends on dimensions of the particles, it can be applied to disperse large bundles of CNTs within the suspension 31. Dielectrophoretically located CNTs were also reported for facilitating the post‐dielectrophoretic (DEP) deposition of metals from an aqueous Pd salt solution to decrease the local resistance at the CNT‐CNT and CNT‐microelectrode joints 32.…”

Section: Introductionmentioning

confidence: 99%

“…Although the potential of dielectrophoresis to separate, characterise and purify the target cells has been proven in different works 33–36, the developed system can improve the functional range of DEP systems to trap and analyse the cells with low conductivity and permittivity 37. Furthermore, in contrast to most DEP systems that are droplet‐based and employ a droplet of CNT suspension for patterning, characterising or separating purposes 11, 16, 30, 32, 38, the developed DEP system is continuous flow‐based, which facilitates the analysing of a larger amount of the samples. With such a microfluidic system, the complex interaction between micro and nano materials in the presence of an electric field can be observed and investigated.…”

Section: Introductionmentioning

confidence: 99%

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Particle trapping using dielectrophoretically patterned carbon nanotubes

et al. 2010

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This study presents the dielectrophoretic (DEP) assembly of multi-walled carbon nanotubes (MWCNTs) between curved microelectrodes for the purpose of trapping polystyrene microparticles within a microfluidic system. Under normal conditions, polystyrene particles exhibit negative DEP behaviour and are repelled from microelectrodes. Interestingly, the addition of MWCNTs to the system alters this situation in two ways: first, they coat the surface of particles and change their dielectric properties to exhibit positive DEP behaviour; second, the assembled MWCNTs are highly conductive and after the deposition serve as extensions to the microelectrodes. They establish an array of nanoelectrodes that initiates from the edge of microelectrodes and grow along the electric field lines. These nanoelectrodes can effectively trap the MWCNT-coated particles, since they cover a large portion of the microchannel bottom surface and also create a much stronger electric field than the primary microelectrodes as confirmed by our numerical simulations. We will show that the presence of MWCNT significantly changes performance of the system, which is investigated by trapping sample polystyrene particles with plain, COOH and goat anti-mouse IgG surfaces.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Particle trapping using dielectrophoretically patterned carbon nanotubes

et al. 2010

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“…Figure 3 a shows the representative I-V characteristic of RGOS-based electrical circuits. The characteristic is linear and symmetric [ 16 ]. The measured resistance is calculated about 12.3 k Ω.…”

Section: Methodsmentioning

confidence: 99%

Fabrication, electrical characterization, and detection application of graphene-sheet-based electrical circuits

Peng

Lei

2014

Nanoscale Res Lett

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The distribution of potential, electric field, and gradient of square of electric field was simulated via a finite element method for dielectrophoresis (DEP) assembly. Then reduced graphene oxide sheets (RGOS)- and graphene oxide sheets (GOS)-based electrical circuits were fabricated via DEP assembly. The mechanically exfoliated graphene sheets (MEGS)-based electrical circuit was also fabricated for comparison. The electrical transport properties of three types of graphene-based electrical circuits were measured. The MEGS-based electrical circuit possesses the best electrical conductivity, and the GOS-based electrical circuit has the poorest electrical conductivity among all three circuits. The three types of electrical circuits were applied for the detection of copper ions (Cu2+). The RGOS-based electrical circuit can detect the Cu2+ when the concentration of Cu2+ was as low as 10 nM in solution. The GOS-based electrical circuit can only detect Cu2+ after chemical reduction. The possible mechanism of electron transfer was proposed for the detection. The facile fabrication method and excellent performance imply the RGOS-based electrical circuit has great potential to be applied to metal ion sensors.

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“…It also means the resistance of a CNT-CNT junction when an overlapped joint takes place between two CNTs. The two cases are demonstrated in Fig.1, in which the CNT-CNT contact is shown in the middle dashed box b, and the CNT-metal contacts are shown in the other two boxes a and c, as explained by Ranjan and Mertig [17]. The contact resistance plays a key role in the application of CNTs in nanoelectronics.…”

Section: Introductionmentioning

confidence: 95%

“…After the metal deposition, the whole resistance including the conductive resistance of MWNTs and contact resistance was on the order of 100 Ω. Vilà et al [64] obtained metallic contacts to access different nanometer-sized materials using a dual-beam FIB instrument which was equipped with a C9H16Pt injector to deposit Pt. Ranjan and Merrtig [17] reported the improvement of contact resistance of CNTs by the deposition of metal from an aqueous Pd salt solution. The overall resistance was below 1 MΩ in their experiments.…”

Section: Metal Depositionmentioning

confidence: 99%

On Contact Resistance of Carbon Nanotubes

An¹,

Yang²,

Chang³

2013

IJTAN

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Carbon nanotubes (CNTs) have found many potential applications stemming from their small dimensions and marvellous electronic, mechanical, and thermal properties. One of the barriers for using CNTs as building blocks in nanoelectronics is the high contact resistance. This paper reviews recent progress on the research of contact resistance of CNTs. It starts with a preview of two basic contact configurations, i.e., side contact and end contact, and measurements of contact resistance. The formation of Schottky barrier on a typical metal-semiconductor contact is then presented, aiming at looking for ways to reduce contact resistance from a theoretical point of view. The current techniques for improving CNT contact resistance are classified and summarized as well. The principles and applicabilities of these techniques are compared and discussed. A deep understanding of the forming mechanisms and improvement methods of contact resistance is critical in order to bring CNT-based devices from laboratory to the real-world technology.

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Dielectrophoretically assembled carbon nanotube‐metal hybrid structures with reduced contact resistance

Cited by 14 publications

References 13 publications

Particle trapping using dielectrophoretically patterned carbon nanotubes

Particle trapping using dielectrophoretically patterned carbon nanotubes

Fabrication, electrical characterization, and detection application of graphene-sheet-based electrical circuits

On Contact Resistance of Carbon Nanotubes

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