Carbon Nanotubes Encapsulated in Wormlike Hollow Silica Shells

Grzelczak, Marek; Correa‐Duarte, Miguel A.; Liz‐Marzán, Luis M.

doi:10.1002/smll.200600152

Cited by 57 publications

(76 citation statements)

References 49 publications

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“…8). [109] This process comprised successive acid-and base-catalyzed silica condensation steps after CNT functionalization with PAH. Similar procedures were employed to engineer more sophisticated hollow nanocomposites with interesting mechanical and magnetic functionalities such as onion-like capsules [110] or sea-anemone-like, magnetic capsules reinforced with CNTs.…”

Section: Polymer and Surfactant Stabilized Inorganic Particlesmentioning

confidence: 99%

Recent Progress on Silica Coating of Nanoparticles and Related Nanomaterials

2010

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In recent years, new strategies for silica coating of inorganic nanoparticles and organic nanomaterials, which differ from the classical methodologies, have emerged at the forefront of materials science. Silica as a coating material promises an unparalleled opportunity for enhancement of colloidal properties and functions by using core-shell rational designs and profiting from its synthetic versatility. This contribution provides a brief overview of recent progress in the synthesis of silica-coated nanomaterials and their significant impact in different areas such as spectroscopy, magnetism, catalysis, and biology.

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Section: Polymer and Surfactant Stabilized Inorganic Particlesmentioning

confidence: 99%

Recent Progress on Silica Coating of Nanoparticles and Related Nanomaterials

2010

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“…As a result of their nanoscale dimensions and high surface area, CNTs could be also considered as efficient templates for the assembly of nanoparticles [5]. The alignment of CNTs as fillers in a variety of matrices can be used to reinforce, intensify, and enhance some of the properties of the resulting composites as well as introduce various degrees of anisotropy into the properties of the desired nanomaterials [6–7].…”

Section: Introductionmentioning

confidence: 99%

Anisotropic conductivity of magnetic carbon nanotubes embedded in epoxy matrices

Kim

Tannenbaum

2011

Carbon

111

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Maghemite (γ-Fe 2 O 3 )/multi-walled carbon nanotubes (MWCNTs) hybrid-materials were synthesized and their anisotropic electrical conductivities as a result of their alignment in a polymer matrix under an external magnetic field were investigated. The tethering of γ-Fe 2 O 3 nanoparticles on the surface of MWCNT was achieved by a modified sol-gel reaction, where sodium dodecylbenzene sulfonate (NaDDBS) was used in order to inhibit the formation of a 3D iron oxide gel. These hybrid-materials, specifically, magnetized multi-walled carbon nanotubes (m-MWCNTs) were readily aligned parallel to the direction of a magnetic field even when using a relatively weak magnetic field. The conductivity of the epoxy composites formed in this manner increased with increasing m-MWCNT mass fraction in the polymer matrix. Furthermore, the conductivities parallel to the direction of magnetic field were higher than those in the perpendicular direction, indicating that the alignment of the m-MWCNT contributed to the enhancement of the anisotropic electrical properties of the composites in the direction of alignment.

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“…The process involves the initial production of uniform silica tubes in the AAO channels and then a CVD process with ethylene as the feedstock to form CNT in the core of the silica nanotubes. Other approaches for the synthesis of silica coated CNT mainly involve a post‐processing step based on wet‐chemistry 12–17. This involves multiple step solution‐processing of the CNT including purification, dispersion, and functionalization, as well as complicated procedures to generating the silica coating 12, 16.…”

Section: Resultsmentioning

confidence: 99%

Novel method controlled synthesis of silica coated carbon nanotubes

Chen

Cendrowski

Rümmeli

et al. 2010

Physica Status Solidi (a)

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In this contribution we present an easy and efficient method for the controlled synthesis of highly uniform silica coated coaxial carbon nanotubes (CNT). Furthermore, the thickness of silica wall, CNT, and the diameter of CNT could be controlled at will. This process involves the use of an anodized aluminum oxide (AAO) template to grow this molecular hybrid. After removal of the AAO template, free CNT@SiO2 nanotubes are obtained. Since silica is a light transparent, the combination of CNT and silica in one‐dimensional core–shell structures provides new oppotunities for photo‐electronic and functional applications. Scheme representing the synthesis route of CNT coated with silica.

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Carbon Nanotubes Encapsulated in Wormlike Hollow Silica Shells

Cited by 57 publications

References 49 publications

Recent Progress on Silica Coating of Nanoparticles and Related Nanomaterials

Recent Progress on Silica Coating of Nanoparticles and Related Nanomaterials

Anisotropic conductivity of magnetic carbon nanotubes embedded in epoxy matrices

Novel method controlled synthesis of silica coated carbon nanotubes

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