Synthetic strategies for Y-junction carbon nanotubes

Deepak, Francis Leonard; Govindaraj, A.; Rao, C. N. R.

doi:10.1016/s0009-2614(01)00849-1

Cited by 107 publications

(68 citation statements)

References 10 publications

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“…Recently, Y-shaped nanotubes have been successfully fabricated by many different methods, including alumina templates (28), chemical vapor deposition of products generated from a pyrolysis of metallocenes (29)(30)(31), nano-welding of overlapping isolated nanotubes using high-intensity electron beams (32), and spontaneous growth of nanotube mats using Ti-doped Fe catalysts (33). Those nanotubes were found to exhibit both electrical switching and logic behavior (2,13).…”

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confidence: 99%

Water-mediated signal multiplication with Y-shaped carbon nanotubes

Xiu

Wan

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

122

110

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Molecular scale signal conversion and multiplication is of particular importance in many physical and biological applications, such as molecular switches, nano-gates, biosensors, and various neural systems. Unfortunately, little is currently known regarding the signal processing at the molecular level, partly due to the significant noises arising from the thermal fluctuations and interferences between branch signals. Here, we use molecular dynamics simulations to show that a signal at the single-electron level can be converted and multiplied into 2 or more signals by water chains confined in a narrow Y-shaped nanochannel. This remarkable transduction capability of molecular signal by Y-shaped nanochannel is found to be attributable to the surprisingly strong dipoleinduced ordering of such water chains, such that the concerted water orientations in the 2 branches of the Y-shaped nanotubes can be modulated by the water orientation in the main channel. The response to the switching of the charge signal is very rapid, from a few nanoseconds to a few hundred nanoseconds. Furthermore, simulations with various water models, including TIP3P, TIP4P, and SPC/E, show that the transduction capability of the Y-shaped carbon nanotubes is very robust at room temperature, with the interference between branch signals negligible.confined water ͉ molecular dynamics ͉ molecular signal transmission ͉ Y-shaped nanochannel ͉ signal transduction

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mentioning

confidence: 99%

Water-mediated signal multiplication with Y-shaped carbon nanotubes

Xiu

Wan

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

122

110

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“…Figure 1 shows the overall morphologies of the junctions that are produced; the branching morphologies are similar to those reported previously. [9,10,[12][13][15][16][17] Junctions of variable thickness (Figure 1 a,b,d,e) and with multiple branching, where the density of branches increases considerably (Figure 1 c,f), were produced. Figure 1 g,h depicts scanning electron microscopy (SEM) images and bright field STEM images of one of the produced junctions.…”

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confidence: 99%

An Atomistic Branching Mechanism for Carbon Nanotubes: Sulfur as the Triggering Agent

et al. 2008

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“…To produce the macro-yield branched CNTs, the most used route is to introduce various additive elements in the reactant. One of the most used additive elements is sulfur, which would be decomposed from sulfur-containing materials such as thiophene [155,157,[166][167][168][169][170] and octadecanethiol. [49] Sulfur can promote the growth of branched junctions in the pyrolysis of organometallic precursors, such as nickelocene, [157] ferrocence, [166] nickel phthalocyanines, [155,170] iron phthalocyanines, [169,170] and iron pentacarbonyl.…”

Section: Cvd Methodsmentioning

confidence: 99%

“…[49] Sulfur can promote the growth of branched junctions in the pyrolysis of organometallic precursors, such as nickelocene, [157] ferrocence, [166] nickel phthalocyanines, [155,170] iron phthalocyanines, [169,170] and iron pentacarbonyl. [170] This was first reported by Rao et al in 2000. [157] Nickelocene was used as both a catalyst source and a carbon feedstock in combination with hydrogen bubbled through thiophene in an argon carrying gas.…”

Section: Cvd Methodsmentioning

confidence: 99%

The Intramolecular Junctions of Carbon Nanotubes

2008

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For the miniaturization of microelectronics, carbon nanotubes (CNTs) are regarded as ideal candidates for the next generation of nanoelectronics because of their excellent properties. To realize CNT‐based electronics, intramolecular junctions are required components, which can not only connect different CNTs for integration, but can also act as functional building blocks in the circuit, such as rectifiers, field‐effect transistors, switches, amplifiers, photoelectrical devices, etc. Therefore, intense attention has been focused on this topic and many advances have been achieved, especially in recent years. On the other hand, some challenges also exist. To provide researchers with a comprehensive overview of this field, this review discusses the synthesis, properties, and applications of intramolecular junctions of CNTs in detail. Among them, the applications of CNT integration are discussed specially. Furthermore, a brief summary and an outlook of future work are provided.

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Synthetic strategies for Y-junction carbon nanotubes

Cited by 107 publications

References 10 publications

Water-mediated signal multiplication with Y-shaped carbon nanotubes

Water-mediated signal multiplication with Y-shaped carbon nanotubes

An Atomistic Branching Mechanism for Carbon Nanotubes: Sulfur as the Triggering Agent

The Intramolecular Junctions of Carbon Nanotubes

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