Analysis on the synthesis of vertically aligned carbon nanotubes: growth mechanism and techniques

Sharma, Prachi; Pavelyev, V. S.; Kumar, Sunil; Mishra, Prabhash; Islam, S. S.; Tripathi, Nishant

doi:10.1007/s10854-020-03021-6

Cited by 33 publications

(28 citation statements)

References 160 publications

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“…Carbon atoms can equally attach and grow on the Fe 3 C surface, leading to the comparatively straight CNTs structures. In addition, the quickly generated Fe 3 C and carbon atoms may form a dense array of CNTs at the initial CVD stage; with the increase of reaction time, CNTs may grow orientated under the effect of steric hindrance …”

Section: Resultsmentioning

confidence: 99%

“…In addition, the quickly generated Fe 3 C and carbon atoms may form a dense array of CNTs at the initial CVD stage; with the increase of reaction time, CNTs may grow orientated under the effect of steric hindrance. 37 Structure of CNTs/SiC Membranes. To investigate the CNTs growth depth and uniformity on the SiC support, the cross-sectional images of the CNTs/SiC membrane with different magnifications were captured.…”

Section: ■ Experimentsmentioning

confidence: 99%

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Steric Configuration-Controllable Carbon Nanotubes-Integrated SiC Membrane for Ultrafine Particles Filtration

Yuan

Feng

Zhang

et al. 2020

Ind. Eng. Chem. Res.

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Airborne fine particles have severe effects on abating the duration and efficiency of filters due to their high penetration probability. One-dimensional (1D) nanomaterials-constructed filters show great promise in efficient removal of fine particles. In this work, in situ growth of 1D nanostructure membrane without introducing a transition or sacrificial layer on large-pore SiC support was creatively developed. The controllable growth of carbon nanotubes (CNTs) via chemical vapor deposition (CVD) can bridge a loose structure on the neighbored SiC particles. This CNTs-constructed hierarchical structure can significantly ameliorate the large pores of the SiC support (SiC pore size ∼32.9 μm, CNTs/SiC membrane pore size ∼15 μm). By adjusting the CVD parameters, different configurations of CNT membranes were controllably prepared, in which the special structure of the CNT membrane (S-CNTs/SiC) showed a comparatively higher gas permeance of ∼450 m3/(m2·h·kPa) and fine particle removal efficiency (99.48%). In addition, the S-CNTs/SiC membrane also showed a good long-term filtration performance for fine particles. This work provides a new insight into the preparation of a 1D nanostructure membrane on large-pore ceramic supports high-efficient removal of fine particles.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Experimentsmentioning

confidence: 99%

Steric Configuration-Controllable Carbon Nanotubes-Integrated SiC Membrane for Ultrafine Particles Filtration

Yuan

Feng

Zhang

et al. 2020

Ind. Eng. Chem. Res.

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“…Made of billions of vertically aligned CNT per centimeter square area, typically ~10 9 -10 12 VACNT/cm 2 [11], the VACNT show exclusive potential for improving the surface area, chemical and thermal stability, electrical conductivity, and other properties of different materials and their final use [8,[12][13][14][15][16].…”

Section: Vertically Aligned Carbon Nanotubes (Vacnt)-cnt Assembly Wit...mentioning

confidence: 99%

“…Once observed to possess highly interesting properties, today's research focuses on the effective production of CNT with different properties and arrangements, thus, expanding their application portfolio. The effective production of CNT is of high importance to develop industrial-grade, ready-to-use, CNT materials and overpass many challenges concerning production cost, energy consumption, environmental sustainability, material concept, and performance [6][7][8][9]. One of many, the VACNT, also known as CNT forests, arrays, or carpets, are a dense network of CNT commonly aligned in a direction perpendicular to a substrate used for the growth [9,10].…”

Section: Introduction 1importance Of Carbon Nanotubes (Cnt) In the De...mentioning

confidence: 99%

Conducting Interface for Efficient Growth of Vertically Aligned Carbon Nanotubes: Towards Nano-Engineered Carbon Composite

2022

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Vertically aligned carbon nanotubes (VACNT) are manufactured nanomaterials with excellent properties and great potential for numerous applications. Recently, research has intensified toward achieving VACNT synthesis on different planar and non-planar substrates of various natures, mainly dependent on the user-defined application. Indeed, VACNT growth has to be adjusted and optimized according to the substrate nature and shape to reach the requirements for the application envisaged. To date, different substrates have been decorated with VACNT, involving the use of diffusion barrier layers (DBLs) that are often insulating, such as SiO2 or Al2O3. These commonly used DBLs limit the conducting and other vital physico-chemical properties of the final nanomaterial composite. One interesting route to improve the contact resistance of VACNT on a substrate surface and the deficient composite properties is the development of semi-/conducting interlayers. The present review summarizes different methods and techniques for the deposition of suitable conducting interfaces and controlled growth of VACNT on diverse flat and 3-D fibrous substrates. Apart from exhibiting a catalytic efficiency, the DBL can generate a conducting and adhesive interface involving performance enhancements in VACNT composites. The abilities of different conducting interlayers are compared for VACNT growth and subsequent composite properties. A conducting interface is also emphasized for the synthesis of VACNT on carbonaceous substrates in order to produce cost-effective and high-performance nano-engineered carbon composites.

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“…Pre-aligned CNTs are more suited for the fabrication of VACNT membranes compared to CNT powders because an additional post-alignment process is not necessary. In addition, the synthesis method affects the specifications of the CNTs, namely, their diameter, length, density, and number of walls [ 24 , 25 ]. The three main techniques used to synthesize VACNT arrays are arc discharge, laser ablation, and chemical vapor deposition (CVD), as shown in Figure 2 .…”

Section: Synthesis Of Vacntsmentioning

confidence: 99%

Vertically Aligned Carbon Nanotube Membranes: Water Purification and Beyond

et al. 2020

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Vertically aligned carbon nanotube (VACNT) membranes have attracted significant attention for water purification owing to their ultra-high water permeability and antibacterial properties. In this paper, we critically review the recent progresses in the synthesis of VACNT arrays and fabrication of VACNT membrane methods, with particular emphasis on improving water permeability and anti-biofouling properties. Furthermore, potential applications of VACNT membranes other than water purification (e.g., conductive membranes, electrodes in proton exchange membrane fuel cells, and solar electricity–water generators) have been introduced. Finally, future outlooks are provided to overcome the limitations of commercialization and desalination currently faced by VACNT membranes. This review will be useful to researchers in the broader scientific community as it discusses current and new trends regarding the development of VACNT membranes as well as their potential applications.

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Analysis on the synthesis of vertically aligned carbon nanotubes: growth mechanism and techniques

Cited by 33 publications

References 160 publications

Steric Configuration-Controllable Carbon Nanotubes-Integrated SiC Membrane for Ultrafine Particles Filtration

Steric Configuration-Controllable Carbon Nanotubes-Integrated SiC Membrane for Ultrafine Particles Filtration

Conducting Interface for Efficient Growth of Vertically Aligned Carbon Nanotubes: Towards Nano-Engineered Carbon Composite

Vertically Aligned Carbon Nanotube Membranes: Water Purification and Beyond

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