Synthesis and Raman characterization of mono-sized single-wall carbon nanotubes in one-dimensional channels of AlPO 4 -5 crystals

Sun, Handong; Tang, Zikang; Chen, J.; Li, G.

doi:10.1007/s003390051018

Cited by 71 publications

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“…The lack of purity and uniformity in diameter, chirality, and their alignment has been a hindrance in exploring intrinsic chemistry and physics as well as in developing nanoscaled device applications of the novel electronic system. In our previous work, we reported fabrication of monodispersed SWNTs of diameters as small as 0.4 nm inside the channels of AlPO 4 -5 (structure code AFI) zeolite crystals. − These perfectly aligned 0.4-nm SWNTs provide a good platform to experimentally test the theoretical expectations for the quasi-one-dimensional (1D) material system. − …”

Section: Introductionmentioning

confidence: 99%

Thermal Decomposition of Carbon Precursors in Decorated AFI Zeolite Crystals

et al. 2006

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Mass spectrometry and thermogravimetric analysis are used to explore the thermal decomposition of carbon precursors (primarily the tripropylammonium cations) occluded within AlPO(4)-5 (AFI) crystals prepared in various media (in the presence or absence of F(-) ions, Si(4+) substations of P(5+)), with the aim to fabricate high-density 0.4-nm single-walled carbon nanotubes (SWNTs). It has been found that the tripropylammonium precursors exist in the as-synthesized crystals in three different forms: tripropylammonium fluoride, hydroxide, and tripropylammonium cation compensating for the negative charge of the framework. The latter is bonded to the framework by strong chemical interaction and its decomposition takes place by a series of beta-elimination reactions to give propylene and ammonia, with the stepwise formation of dipropylammonium and n-propylammonium cations. The 0.4-nm SWNTs filling density was found to be higher than that resulting from the carbon precursor of tripropylammonium fluoride and hydroxide, because of the strong adsorption force of the channel walls to pyrolysate, as evidenced by the clear and strong radial breathing modes in Raman spectra.

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Section: Introductionmentioning

confidence: 99%

Thermal Decomposition of Carbon Precursors in Decorated AFI Zeolite Crystals

et al. 2006

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“…An important recent development is the use of zeolite channels as templates to synthesize SWNTs. − An intriguing finding from this zeolite work is that interactions with the channel walls during nanotube formation were observed to lead to selection of a particular nanotube structure . If control could be achieved for a range of diameters, this could provide an important tool for controlling SWNT properties.…”

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confidence: 99%

Uniform-Diameter Single-Walled Carbon Nanotubes Catalytically Grown in Cobalt-Incorporated MCM-41

et al. 2003

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Single-walled carbon nanotubes of uniform diameter were grown in cobalt-substituted MCM-41 molecular sieves templated with C12 and C16 alkyl chains to result in pore diameters of 2.6 and 3.3 nm, respectively. The narrow diameter distribution of the tubes grown was probed by Raman, UV-visible, and NIR spectroscopy, as well as by high-resolution transmission electron microscopy. Tube diameters have been observed to vary with the size of the Co clusters formed during carbon deposition, as measured by extended X-ray absorption fine structure (EXAFS). It is proposed that the diameter of the carbon nanotubes grown in MCM-41 catalysts is controlled by the size of the metallic clusters formed in the template. Because MCM-41 catalysts of different pore diameter form Co clusters of different sizes, this mechanism can be exploited to grow carbon nanotubes of uniform, preselected diameters.As widely reported, 1-5 carbon nanotubes exhibit technologically important electronic properties potentiating new device development. They can be found in both metallic and semiconducting structures. The structure of the single-walled nanotube (SWNT) is defined by how the graphitic sheet is aligned in the rolled up configuration. Metallic (m) nanotubes can carry extremely large current densities; 6 semiconducting (s) nanotubes can be electrically switched on and off as field-effect transistors (FETs) (e.g., ref 6). Most electronic applications of carbon nanotubes require aligned SWNTs that are reasonably homogeneous in diameter, length, and electronic properties. Odom et al. 7 used scanning tunneling microscopy (STM) to correlate atomic structure with electronic properties of SWNTs. They found that the electronic properties correlate both with the diameter and helicity (twist). This important work illustrates why control of SWNT diameter and structure is of crucial importance for the development of new electronic devices based on SWNTs.

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“…Smaller- diameter SWNTs were found to be more susceptible to oxidation in air than their larger diameter counterparts , Other groups have pursued variations on conventional SWNT growth techniques with a view to obtaining diameter selectivity but with varying levels of success. , …”

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confidence: 99%

Demonstration of Diameter-Selective Reactivity in the Sidewall Ozonation of SWNTs by Resonance Raman Spectroscopy

Banerjee

Wong

2004

Nano Lett.

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Strategies for single-walled carbon nanotube (SWNT) separation are critical to developing nanotubes as useful nanoscale building blocks. Herein, we demonstrate that solution-phase ozonolysis of SWNTs fosters diameter selectivity in SWNTs. The main conclusion of our work is that in this sidewall addition reaction, smaller diameter tubes react more extensively than larger diameter tubes, which provides experimental validation for theoretical predictions on the role of pyramidalization and π-orbital misalignment in nanotube reactivity.

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Synthesis and Raman characterization of mono-sized single-wall carbon nanotubes in one-dimensional channels of AlPO 4 -5 crystals

Cited by 71 publications

References 0 publications

Thermal Decomposition of Carbon Precursors in Decorated AFI Zeolite Crystals

Thermal Decomposition of Carbon Precursors in Decorated AFI Zeolite Crystals

Uniform-Diameter Single-Walled Carbon Nanotubes Catalytically Grown in Cobalt-Incorporated MCM-41

Demonstration of Diameter-Selective Reactivity in the Sidewall Ozonation of SWNTs by Resonance Raman Spectroscopy

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