Self‐Templated Growth of Carbon‐Nanotube Walls at High Temperatures

Huang, Jianyu; Ding, Feng; Jiang, Kun; Yakobson, Boris I.

doi:10.1002/smll.200700105

Cited by 20 publications

(15 citation statements)

References 34 publications

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“…The most frequently observed phenomenon was the formation of active inter-shell defects ( Fig. 2) as also reported by Huang et al [12,13]. Due to the dangling bonds of the twocoordinate carbon atoms at the open edges they are expected to be highly reactive, especially at high temperatures.…”

Section: Resultssupporting

confidence: 69%

Direct evidence for lip-lip interactions in multi-walled carbon nanotubes

2008

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1 Also, we have demonstrated that single-walled carbon nanotubes prefer to grow with a closed end in a special case-inner growth [4]. ABSTRACTThe stability of open edged multi-walled carbon nanotubes has been investigated by using in situ high resolution transmission electron microscopy at elevated temperatures. Formation of inter-shell structures was experimentally observed for the first time and attributed to a robust interaction between adjacent concentric shells (so-called lip lip interaction). The fl uctuating behavior of the inter-shell structures suggests a mechanism by which the carbon atoms can pass in or out through the inter-shell edges during carbon nanotube growth or shrinkage processes.

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Section: Resultssupporting

confidence: 69%

Direct evidence for lip-lip interactions in multi-walled carbon nanotubes

2008

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“…The results indicate the elevated pyrolysis temperature leads to the formation of amorphous carbon. In addition, the insets of Figure C show the arising of two broad peaks at ~2700 and 2930 cm –1 , revealing the decrease of the graphitic crystals size with increase of the temperature . Similar tendency was also reported elsewhere.…”

Section: Resultssupporting

confidence: 88%

“…[15] XPS survey shows a similar tendency with Raman results (Figures D, S5). In the high‐resolution scanning spectra of C1s peak, peak 1 and peak 2 correspond to sp 2 and sp 3 , respectively . A lower sp 2 ‐sp 3 ratio is obtained with the temperature increase, which demonstrates the decreased graphitization degree.…”

Section: Resultsmentioning

confidence: 96%

“…Another important advantage of CVD is the formation of conformal coating, which makes it suitable to replicate nano/micro‐structures. CVD has been widely used in synthesizing carbon nanotubes and graphene with metals as catalysts . In most CVD processes, however, the carbon sources used are usually gases, such as ethylene, acetylene, acetonitrile, methane, toluene, [13] and so forth.…”

Section: Background and Originality Contentmentioning

confidence: 99%

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Nano‐structured Hollow Carbon Materials from a Non‐isothermal Chemical Vapor Deposition of Polyphenols

Cai

Yang

et al. 2020

Chin. J. Chem.

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of main observation and conclusion Pyrogallic acid (PG) was used as a modeling carbon source in fabricating nano-structured hollow carbon materials (HCMs) by a chemical vapor deposition (CVD) method. We found that non-isothermal deposition can improve the integrity of the obtained HCMs. The different pyrolyzed species from PG under varied temperatures lead to the temperature-dependent deposition yield, graphitization degree and morphology of the HCMs. HCMs including hollow spheres of varied sizes, cubic boxes with yolk-shell structure, nanotubes, mesoporous particles and double-shelled fibers, were prepared by using different templates, demonstrating the universality of this strategy. The carbon source has been extended to other plant polyphenols. The abundant and renewable solid precursors for CVD method endow this strategy excellent operation safety, improved storage and transportation convenience and low cost, and would boost the production of morphology-and size-controlled HCMs and their applications in the fields such as water treatment, electrode materials, adsorbent, drug delivery, and so forth.

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“…The physical properties of these materials, such as their mechanical and transport properties are significantly diminished compared to individual CNTs [8,9,10]. Several methods have been suggested to improve the properties of bulk CNT materials, such as chemical or metallic doping [11], solvent densification [12], and annealing [13,14].…”

Section: Introductionmentioning

confidence: 99%

Influence of annealing on thermal and electrical properties of carbon nanotube yarns

Niven

Johnson

Juckes

et al. 2016

Carbon

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The physical properties of dry-spun MWCNT yarns with diameters from 35 to 60 μm were systematically determined as a function of annealing up to 2700 °C. Raman spectroscopy showed a ~5 fold increase in relative CNT crystallinity after annealing. Electrical conductivity and magnetoresistance (in fields up to 9 T) were measured from 2 K to 390 K. Thermal conductivity from 50 K to 300 K was determined using the parallel thermal conductance method. The electrical and thermal conductivities of the yarns both increased by over 100 % after annealing to 2700 °C. The influence of adsorbed species on the electrical properties of the yarns was also studied.

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Self‐Templated Growth of Carbon‐Nanotube Walls at High Temperatures

Cited by 20 publications

References 34 publications

Direct evidence for lip-lip interactions in multi-walled carbon nanotubes

Direct evidence for lip-lip interactions in multi-walled carbon nanotubes

Nano‐structured Hollow Carbon Materials from a Non‐isothermal Chemical Vapor Deposition of Polyphenols

Influence of annealing on thermal and electrical properties of carbon nanotube yarns

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