Growth of Millimeter-Scale Vertically Aligned Carbon Nanotubes by Microwave Plasma Chemical Vapor Deposition

Kim, Yooseok; Song, Wooseok; Lee, Seung Youb; Shrestha, Sabita; Jeon, Cheolho; Choi, Won Jun; Kim, Minkook; Park, Chong-Yun

doi:10.1143/jjap.49.085101

Cited by 15 publications

(4 citation statements)

References 27 publications

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“…Kim et al [62] reported that oxygen-assisted MPECVD using a mixture of CH 4 /H 2 gases with a Fe/Al 2 O 3 /Si substrate and a temperature of 700°C could give MWCNTs with 4.08 μm length and 5 – 10 nm diameter. They found that upon adding O 2 to the chamber, the CNTs growth rate increased three-fold in comparison with MECVD and two-fold in comparison with WA-MECVD.…”

Section: Carbon Nanotubesmentioning

confidence: 99%

Carbon nanotubes part I: preparation of a novel and versatile drug-delivery vehicle

Karimi

Solati

Amiri

et al. 2015

Expert Opinion on Drug Delivery

102

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Introduction It is 23 years since carbon allotrope known as carbon nanotubes (CNT) was discovered by Iijima, who described them as “rolled graphite sheets inserted into each other”. Since then, CNTs have been studied in nanoelectronic devices. However, CNTs also possess the versatility to act as drug- and gene-delivery vehicles. Areas covered This review covers the synthesis, purification and functionalization of CNTs. Arc discharge, laser ablation and chemical vapor deposition are the principle synthesis methods. Non-covalent functionalization relies on attachment of biomolecules by coating the CNT with surfactants, synthetic polymers and biopolymers. Covalent functionalization often involves the initial introduction of carboxylic acids or amine groups, diazonium addition, 1,3-dipolar cycloaddition or reductive alkylation. The aim is to produce functional groups to attach the active cargo. Expert opinion In this review, the feasibility of CNT being used as a drug-delivery vehicle is explored. The molecular composition of CNT is extremely hydrophobic and highly aggregation-prone. Therefore, most of the efforts towards drug delivery has centered on chemical functionalization, which is usually divided in two categories; non-covalent and covalent. The biomedical applications of CNT are growing apace, and new drug-delivery technologies play a major role in these efforts.

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Section: Carbon Nanotubesmentioning

confidence: 99%

Carbon nanotubes part I: preparation of a novel and versatile drug-delivery vehicle

Karimi

Solati

Amiri

et al. 2015

Expert Opinion on Drug Delivery

102

View full text Add to dashboard Cite

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“…For flat substrates with fully open and accessible surfaces, AOB can be prepared by both physical and chemical methods, including atomic layer deposition (ALD), electron beam physical vapor deposition (a.k.a. e-beam evaporation), thermal evaporation, spin coating, dip coating, the sol–gel process, and the layer-by-layer (LBL) assembly. − When the substrates have spatially complex structures such as highly curved surfaces, particularly those hidden in torturous pores, the creation of a uniform AOB layer to support the growth of CNT arrays is no longer feasible by using most of the existing methods. To our knowledge, aligned CNT arrays have only been synthesized on highly curved surfaces either treated using the expensive ALD method , or with preexisting oxide coatings that can act as buffer, for example, ceramic fibers made of aluminum oxide , and stainless steel with chromium oxide. , …”

Section: Introductionmentioning

confidence: 99%

Chemical Bath Deposition of Aluminum Oxide Buffer on Curved Surfaces for Growing Aligned Carbon Nanotube Arrays

Wang

2015

Langmuir

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Direct growth of vertically aligned carbon nanotube (CNT) arrays on substrates requires the deposition of an aluminum oxide buffer (AOB) layer to prevent the diffusion and coalescence of catalyst nanoparticles. Although AOB layers can be readily created on flat substrates using a variety of physical and chemical methods, the preparation of AOB layers on substrates with highly curved surfaces remains challenging. Here, we report a new solution-based method for preparing uniform layers of AOB on highly curved surfaces by the chemical bath deposition of basic aluminum sulfate and annealing. We show that the thickness of AOB layer can be increased by extending the immersion time of a substrate in the chemical bath, following the classical Johnson-Mehl-Avrami-Kolmogorov crystallization kinetics. The increase of AOB thickness in turn leads to the increase of CNT length and the reduction of CNT curviness. Using this method, we have successfully synthesized dense aligned CNT arrays of micrometers in length on substrates with highly curved surfaces including glass fibers, stainless steel mesh, and porous ceramic foam.

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“…During the last two decades, carbon nanotubes (CNTs) represent a fascinating new material that has attracted much attention and scientific interest subsequently followed to identify their remarkable properties and potential applications. [1][2][3][4][5] CNTs can be geometrically described as a seamless cylinder of a rolled up sheet of carbon atoms (single-walled nanotubes, SWNTs) or multiple nested cylinders consisting of rolled up sheet of carbon atoms (multi-walled nanotubes, MWNTs) of varying shapes. 6) Among various methods for synthesis of CNTs, such as laser ablation, arc-discharge, and chemical vapor deposition (CVD), the CVD method has proven to be an effective method to produce large amount of CNTs as well as allowing direct growth of the nanotubes on suitable substrates.…”

Section: Introductionmentioning

confidence: 99%

Macroscopic Synthesis of Vertically Aligned Carbon Nanotubes Using Floating Catalyst Chemical Vapor Deposition Method

Mirbagheri

Kazemzadeh

Maghanaki

2011

Jpn. J. Appl. Phys.

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In this paper, we report an efficient process to grow well-aligned carbon nanotube (CNT) arrays with a good area distribution density (about 5.6 ×107 CNT/mm2). Vertically aligned carbon nanotubes (VA-CNTs) have been produced by controlling flow rate, temperature and catalyst nanoparticles using a floating catalyst chemical vapor deposition (FC-CVD) technique. They were synthesized on quartz substrates at 800 °C from toluene as a carbon source. VA-CNT samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy and their surface area and pore size were determined by nitrogen adsorption analysis. The synthesized CNTs have a length of 500 µm and diameters ranging from 120±40 nm. The CNT filaments form a strength structure and exhibit a good vertical alignment. The remarkable properties of CNTs make them attractive for separation applications, especially for water and wastewater treatment.

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Growth of Millimeter-Scale Vertically Aligned Carbon Nanotubes by Microwave Plasma Chemical Vapor Deposition

Cited by 15 publications

References 27 publications

Carbon nanotubes part I: preparation of a novel and versatile drug-delivery vehicle

Carbon nanotubes part I: preparation of a novel and versatile drug-delivery vehicle

Chemical Bath Deposition of Aluminum Oxide Buffer on Curved Surfaces for Growing Aligned Carbon Nanotube Arrays

Macroscopic Synthesis of Vertically Aligned Carbon Nanotubes Using Floating Catalyst Chemical Vapor Deposition Method

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