Gas phase pyrolysis synthesis of carbon nanotubes at high temperature

Hou, Guangfeng; Chauhan, Devika; Ng, Vianessa; Xu, Chenhao; Yin, Zhijun; Paine, Michael L.; Su, Ruitao; Shanov, Vesselin; Mast, David; Schulz, Mark J.; Liu, Yijun

doi:10.1016/j.matdes.2017.06.070

Cited by 35 publications

(32 citation statements)

References 32 publications

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“…As an allotrope of carbon, CNT electrodes offer several outstanding properties, such as excellent flexibility, fast charge transport, large surface-to-volume ratio, good chemical stability, high electrical conductivity and high reversible capacity [18][19][20][21][22][23][24][25][26]. Several methods to synthesize CNT have been demonstrated, e.g., chemical vapor deposition (CVD) [25,27], pyrolysis [28], arc 2 of 16 discharge [29,30], laser ablation [31] and electrolysis [32]. These methods allowed the growth of CNT with various morphology, structure and properties.…”

Section: Introductionmentioning

confidence: 99%

Direct Pre-lithiation of Electropolymerized Carbon Nanotubes for Enhanced Cycling Performance of Flexible Li-Ion Micro-Batteries

et al. 2020

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Carbon nanotubes (CNT) are used as anodes for flexible Li-ion micro-batteries. However, one of the major challenges in the growth of flexible micro-batteries with CNT as the anode is their immense capacity loss and a very low initial coulombic efficiency. In this study, we report the use of a facile direct pre-lithiation to suppress high irreversible capacity of the CNT electrodes in the first cycles. Pre-lithiated polymer-coated CNT anodes displayed good rate capabilities, studied up to 30 C and delivered high capacities of 850 mAh g−1 (313 μAh cm−2) at 1 C rate over 50 charge-discharge cycles.

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Section: Introductionmentioning

confidence: 99%

Direct Pre-lithiation of Electropolymerized Carbon Nanotubes for Enhanced Cycling Performance of Flexible Li-Ion Micro-Batteries

et al. 2020

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“…The solubility of carbon in the selected metal catalyst depends on the synthesis temperature and metal catalyst size. The physical and chemical properties of the synthesized carbon nanostructure can be tailored by altering the type of metal catalyst along with synthesis temperature and metal catalyst size [10][11][12]. Similarly, the properties of CNHT depend on the metal particle used, synthesis temperature and particle size.…”

Section: Hybridizing Cnthmentioning

confidence: 99%

Introduction to Carbon Nanotube Hybrid Textiles

Chauhan

Chen

et al. 2019

JTSFT

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Carbon nanotube hybrid textiles (CNHT) are produced from a carbon nanotube (CNT) gas phase pyrolysis floating catalyst process with particle injection. The CNT based metal and ceramic textiles produced can be customized for different applications.Research is underway by a large group of students and faculty members working in different disciplines to further investigate injection of different types of nanoparticles in order to wet the nanotubes and to customize the properties of textiles. A brief introduction to this new material is given in this paper.

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“…During the nucleation and re-nucleation events, particle coagulation exists driven by Brownian motion [38]. In the second nucleation zone, the catalyst particle grows in size due to particle agglomeration driven by particle-particle collision and the collision frequency following classical Smoluchowski theory [37][38][39][40][41]. The CNT growth and aerogel formation zone coincide with the re-nucleation zone.…”

Section: Introductionmentioning

confidence: 99%

Effect of a Metallocene Catalyst Mixture on CNT Yield Using the FC-CVD Process

et al. 2022

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This work studies synthesis of carbon nanotube (CNT) sheet using the high temperature (1400 °C) floating catalyst chemical vapor deposition (FC-CVD) method. Three metallocenes—ferrocene, nickelocene, cobaltocene—and their combinations are used as precursors for metal catalysts in the synthesis process. For the carbon source, an alcohol fuel, a combination of methanol and n-hexane (9:1), is used. First, the metallocenes were dissolved in the alcohol fuel. Then, the fuel mixture was injected into a tube furnace using an ultrasonic atomizer with Ar/H2 carrier gas in a ratio of about 12/1. The synthesis of CNTs from a combination of two or three metallocenes reduces the percentage of metal catalyst impurity in the CNT sheet. However, there is an increase in structural defects in the CNTs when using mixtures of two or three metallocenes as catalysts. Furthermore, the specific electrical conductivity of the CNT sheet was highest when using a mixture of ferrocene and cobaltocene as the catalyst. Overall, the multi-catalyst method described enables tailoring certain properties of the CNT sheet. However, the standard ferrocene catalyst seems most appropriate for large-scale manufacturing at the lowest cost.

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Gas phase pyrolysis synthesis of carbon nanotubes at high temperature

Cited by 35 publications

References 32 publications

Direct Pre-lithiation of Electropolymerized Carbon Nanotubes for Enhanced Cycling Performance of Flexible Li-Ion Micro-Batteries

Direct Pre-lithiation of Electropolymerized Carbon Nanotubes for Enhanced Cycling Performance of Flexible Li-Ion Micro-Batteries

Introduction to Carbon Nanotube Hybrid Textiles

Effect of a Metallocene Catalyst Mixture on CNT Yield Using the FC-CVD Process

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