Specific conditions for Ni catalyzed carbon nanotube growth by chemical vapor deposition

Yudasaka, Masako; Kikuchi, Rie; Matsui, Taisuke; Ohki, Y.; Yoshimura, Susumu; Ota, Etsuro

doi:10.1063/1.114613

Cited by 181 publications

(83 citation statements)

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“…8,13,14 SWNTs usually occur as hexagonal close-packed bundles in which the nanotubes are held together by van der Walls forces. SWNTs are produced by electric arc, 15 laser ablation, 16 CVD [17][18][19] and gas-phase catalytic processes (HiPco). 20 Their growth requires a metal catalyst, usually Fe, Ni, Co, Y or Mo.…”

Section: Carbon Nanotubes-types and Structuresmentioning

confidence: 99%

Applications of Carbon Nanotubes in Biotechnology and Biomedicine

Bekyarova

Ni²,

Malarkey³

et al. 2005

Journal of Biomedical Nanotechnology

248

147

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Due to their electrical, chemical, mechanical and thermal properties, carbon nanotubes are one of the most promising materials for the electronics, computer and aerospace industries. Here, we discuss their properties in the context of future applications in biotechnology and biomedicine. The purification and chemical modification of carbon nanotubes with organic, polymeric and biological molecules are discussed. Additionally we review their uses in biosensors, assembly of structures and devices, scanning probe microscopy and as substrates for neuronal growth. We note that additional toxicity studies of carbon nanotubes are necessary so that exposure guidelines and safety regulations can be established in a timely manner. KeywordsCarbon Nanotubes; Structure; Purification; Modification; Biosensors; Assembly of Structures and Devices; Scanning Probe Tips; Nanosurgery; Substrates for Neuronal Growth Although nanomaterials have existed in nature long before mankind was able to identify forms at the nanoscale level, advances in synthetic chemistry have been one of the driving forces in the development of a biological nanotechnology. Nanomaterials have been designed for a variety of biomedical and biotechnological applications, including bone growth, 1 enzyme encapsulation, 2 biosensors 3, 4 and as vesicles for DNA delivery into living cells. 5,6 Whereas nanotechnology may provide novel materials which can result in revolutionary new structures and devices, biotechnology already offers extremely sophisticated tools to precisely position molecules and assemble hierarchal structures and devices. The application of the principles of biology to nanotechnology provides a valuable route for further miniaturization and performance improvement of artificial devices. The feasibility of the bottom-up approach which is based on molecular recognition and self-assembly properties of proteins has already been proved in many inorganic-organic hybrid systems and devices. Nanodevices with biorecognition properties provide tools at a scale, which offers a tremendous opportunity to study biochemical processes and to manipulate living cells at the single molecule level. The synergetic future of nano-and bio-technologies holds great promise for further advancement in tissue engineering, prostheses, genomics, pharmacogenomics, drug delivery, surgery and general medicine.*Author to whom correspondence should be addressed. NIH Public Access NIH-PA Author ManuscriptNIH-PA Author Manuscript NIH-PA Author ManuscriptEver since Edison discovered that carbon changes its resistance with pressure and a carbon filament glows when an electric current is passed through it, the unique properties of carbon have intrigued scientists. After more than a century of interest, carbon has found its apogee in the fullerenes and carbon nanotubes (CNTs)-arguably the most promising of all nanomaterials. Because of their unique quasi one-dimensional structure and fascinating mechanical and electronic properties, CNTs have captured the attention of physicists...

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Section: Carbon Nanotubes-types and Structuresmentioning

confidence: 99%

Applications of Carbon Nanotubes in Biotechnology and Biomedicine

Bekyarova

Ni²,

Malarkey³

et al. 2005

Journal of Biomedical Nanotechnology

248

147

View full text Add to dashboard Cite

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“…Most of the previously reported methods for the fabrication of these one-dimensional nanostructures involve multi-step processes, following CNT synthesis [6][7][8]. Various techniques have been developed for the synthesis of CNTs [9][10][11]. Thermal (catalytic) CVD still remain one of the dominant methods of their production.…”

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confidence: 99%

Single step process for the synthesis of carbon nanotubes and metal/alloy-filled multiwalled carbon nanotubes

2007

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A single-step approach for the synthesis of multi-walled nanotubes (MWNT) filled with nanowires of Ni/ternary Zr based hydrogen storage alloy has been illustrated. We also demonstrate the generation of COfree hydrogen by methane decomposition over alloy hydride catalyst. The present work also highlights the formation of single-walled nanotubes (SWNT) and MWNTs at varying process conditions. These carbon nanostructures have been characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution TEM (HRTEM), Energy dispersive X-ray analysis (EDX) and Raman spectroscopy. This new approach overcomes the existing multi-step process limitation, with possible impact on the development of future fuel cell, nano-battery and hydrogen sensor technologies.

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“…Similarly, Ni-C shows fiber-like carbon nanotubes (CNT) and spherical carbon onions (CO) (described in TEM section). Metals such as Co and Ni are known to be most active catalysts in carbon nanotube formation and additionally Ni is also known to increase the yield of carbon nanotubes (Ciambelli et al 2005;Yudasaka et al 1995;Baker et al 1972). The Co-C (Fig.…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

Hydrogen adsorption in transition metal carbon nano-structures

2008

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Templated microporous carbons were synthesized from metal impregnated zeolite Y templates. Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) were employed to characterize morphology and structure of the generated carbon materials. The surface area, micro-and meso-pore volumes, as well as the pore size distribution of all the carbon materials were determined by N 2 adsorption at 77 K and correlated to their hydrogen storage capacity. All the hydrogen adsorption isotherms were Type 1 and reversible, indicating physisorption at 77 K. Most templated carbons show good hydrogen storage with the best sample Rh-C having surface area 1817 m 2 /g and micropore volume 1.04 cm 3 /g, achieving the highest as 8.8 mmol/g hydrogen storage capacity at 77 K, 1 bar. Comparison between activated carbons and synthesized templated carbons revealed that the hydrogen adsorption in the latter carbon samples occurs mainly by pore filling and smaller pores of sizes around 6 Å to 8 Å are filled initially, followed by larger micropores. Overall, hydrogen adsorption was found to be dependent on the micropore volume as well as the pore-size, larger micropore volumes showing higher hydrogen adsorption capacity.

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Specific conditions for Ni catalyzed carbon nanotube growth by chemical vapor deposition

Cited by 181 publications

References 0 publications

Applications of Carbon Nanotubes in Biotechnology and Biomedicine

Applications of Carbon Nanotubes in Biotechnology and Biomedicine

Single step process for the synthesis of carbon nanotubes and metal/alloy-filled multiwalled carbon nanotubes

Hydrogen adsorption in transition metal carbon nano-structures

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