Exploring Advantages of Diverse Carbon Nanotube Forests with Tailored Structures Synthesized by Supergrowth from Engineered Catalysts

Zhao, Bin; Futaba, Don N.; Yasuda, Satoshi; Akoshima, Megumi; Yamada, Takeo; Hata, Kenji

doi:10.1021/nn800648a

Cited by 140 publications

(122 citation statements)

References 37 publications

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“…There is currently great interest in controlled synthesis of CNTs with unique structures. 9Ϫ18 CNT arrays, in which CNTs are nearly parallel to each other and perpendicular to the substrate, have been widely investigated for many potential applications, such as field emission devices, 3,18 energy storage, 13 gas sensors, 19 and structural composites. 20 Controlling the morphology of CNT arrays is an essential step toward these applications.…”

mentioning

confidence: 99%

Tailoring the Morphology of Carbon Nanotube Arrays: From Spinnable Forests to Undulating Foams

et al. 2009

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Directly spinning carbon nanotube (CNT) fibers from vertically aligned CNT arrays is a promising way for the application of CNTs in the field of high-performance materials. However, most of the reported CNT arrays are not spinnable. In this work, by controlling catalyst pretreatment conditions, we demonstrate that the degree of spinnability of CNTs is closely related to the morphology of CNT arrays. Shortest catalyst pretreatment time led to CNT arrays with the best spinnability, while prolonged pretreatment resulted in coarsening of catalyst particles and nonspinnable CNTs. By controlling the coalescence of catalyst particles, we further demonstrate the growth of undulating CNT arrays with uniform and tunable waviness. The CNT arrays can be tuned from well-aligned, spinnable forests to uniformly wavy, foam-like films. To the best of our knowledge, this is the first systematical study on the correlation between catalyst pretreatment, CNT morphology, and CNT spinnability.

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confidence: 99%

Tailoring the Morphology of Carbon Nanotube Arrays: From Spinnable Forests to Undulating Foams

et al. 2009

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“…All synthesis reactions were conducted in two types i.e., horizontal (h) and vertical (v) quartz tube furnaces using super growth chemical vapour deposition (SGCVD) methods (Zhao et al 2009;Chiang et al 2011;Yasuda et al 2009;Futaba et al 2009;Yamada et al 2008;Kruszka et al 2014). The investigations were conducted on stainless steel foils.…”

Section: Carbon Nanomaterialsmentioning

confidence: 99%

Phenol adsorption on different nano-sized carbon materials: first comparative study

2015

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Carbon nanofibres and multi-branched carbon nanotubes are synthesized by using a new, proposed in this study method. The acid-base, adsorption and geometric properties of nanomaterials are characterised. Next we present first comparative adsorption and calorimetric studies of phenol uptake from aqueous solutions on mentioned nano-sized carbon materials and on nanotubes having similar diameter. The comparison of carbon nanofibres, multi-branched carbon nanotubes, and multi walled carbon nanotubes shows that for non-porous carbon nanomaterials the concentration of basic surface functionalities determines the mechanism of phenol adsorption. In consequence, larger phenol adsorption is recorded for the most basic nanomaterials (nanofibres and multi walled nanotubes) and smaller for multi branched nanotubes having the smallest surface concentration of basic groups. Possible explanation of differences between enthalpy of phenol displacement on graphite and on studied carbon adsorbents is also given.

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“…These advantages can at first be more readily appreciated in the context of field-emission [67]. A nanotube, with a nanoscale diameter, can have a length that is millions of times larger than its diameter: freestanding nanotubes can be made to lengths of micrometers individually or millimeters [68,69] and beyond in self-supporting arrays (vertically aligned CNT forests). When an electric field is applied to such a high-aspect-ratio structure, it is significantly enhanced near its tip-a fact that we know from basic electrostatics.…”

Section: Nanostructures As Electron Sourcesmentioning

confidence: 99%

Carbon Nanotube Electron Sources: From Electron Beams to Energy Conversion and Optophononics

Nojeh

2014

ISRN Nanomaterials

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Carbon nanotubes have a host of properties that make them excellent candidates for electron emitters. A significant amount of research has been conducted on nanotube-based field-emitters over the past two decades, and they have been investigated for devices ranging from flat-panel displays to vacuum tubes and electron microscopes. Other electron emission mechanisms from carbon nanotubes, such as photoemission, secondary emission, and thermionic emission, have also been studied, although to a lesser degree than field-emission. This paper presents an overview of the topic, with emphasis on these less-explored mechanisms, although field-emission is also discussed. We will see that not only is electron emission from nanotubes promising for electronsource applications, but also its study could reveal unusual phenomena and open the door to new devices that are not directly related to electron beams.

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Exploring Advantages of Diverse Carbon Nanotube Forests with Tailored Structures Synthesized by Supergrowth from Engineered Catalysts

Cited by 140 publications

References 37 publications

Tailoring the Morphology of Carbon Nanotube Arrays: From Spinnable Forests to Undulating Foams

Tailoring the Morphology of Carbon Nanotube Arrays: From Spinnable Forests to Undulating Foams

Phenol adsorption on different nano-sized carbon materials: first comparative study

Carbon Nanotube Electron Sources: From Electron Beams to Energy Conversion and Optophononics

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