Aerosol-assisted chemical vapour deposition synthesis of multi-wall carbon nanotubes: III. Towards upscaling

Meysami, Seyyed Shayan; Koós, Antal A.; Dillon, Frank; Dutta, Madhuri; Grobert, Nicole

doi:10.1016/j.carbon.2015.02.045

Cited by 33 publications

(29 citation statements)

References 44 publications

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“…The production of representative samples at different times during the deposition sequence permitted changes in surface morphology, crystal structure and relative concentrations of atoms, to be linked to changes in functional properties. 265 The morphological control available through use of AACVD could be of key importance to applications in gas sensing, photocatalysis and PEC devices. 261 In recent years particular attention has been drawn to the design of precursors and their ligands in order to improve the properties of the resultant films.…”

Section: Resultsmentioning

confidence: 99%

Solution based CVD of main group materials

2016

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This critical review focuses on the solution based chemical vapour deposition (CVD) of main group materials with particular emphasis on their current and potential applications. Deposition of thin films of main group materials, such as metal oxides, sulfides and arsenides, have been researched owing to the array of applications which utilise them including solar cells, transparent conducting oxides (TCOs) and window coatings. Solution based CVD processes, such as aerosol-assisted (AA)CVD have been developed due to their scalability and to overcome the requirement of suitably volatile precursors as the technique relies on the solubility rather than volatility of precursors which vastly extends the range of potentially applicable compounds. An introduction into the applications and precursor requirements of main group materials will be presented first followed by a detailed discussion of their deposition reviewed according to this application. The challenges and prospects for further enabling research in terms of emerging main group materials will be discussed.

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Section: Resultsmentioning

confidence: 99%

Solution based CVD of main group materials

2016

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“…CNTs can be obtained by different methods; each having its own specificity, advantages and consequences. The synthesis methods can be classified as physical or high temperature: the method of arc-discharge [10][11][12][13] and the method of laser ablation [14][15][16]; and chemical or medium temperature: a method of chemical vapor deposition (CVD) [17][18][19][20][21][22]. Physical methods allow the production of single-or multi-walled CNTs; presenting very few defects, but the selectivity (the presence of amorphous carbon and other substances) and productivity is often low.…”

Section: Introductionmentioning

confidence: 99%

Characterization of high quality carbon nanotubes synthesized via Aerosol -CVD

Musayeva

Abdullayeva

Frigeri

et al. 2015

JAP

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new Aerosol assisted CVD method of synthesizinglarge amount ofhigh quality carbon nanotubes (CNTs) with good structural parameters has been developed. We report the optimization of the process by experimental variables of thesynthesis condition. The effect of temperature in the hot zone of the reactor was investigated, and 840-950 0C was chosen as an optimum synthesis temperature. CNTs, obtained with different solvents as a carbon source have been analyzed, and ferrocene volume in cyclohexane solvent was varied, as the result of which has been grown MWCNTs with diameters of 10-85 nm and a small percent of SWCNTs with diameters of 0.85 and 1.14 nm. The position of Fe nanoparticles in the CNTs was defined by TEM observations, which show that Fe nanoparticles

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“…Since the potency of such reinforcements strongly depends upon the catalyst content, purity, and defect density of the reinforcing CNTs 26 , maximising the crystallinity and purity of CVD MWCNTs are of prime importance. The quality of MWCNTs could be substantially improved by optimising the CVD conditions [27][28][29][30] or post-synthesis heat treatments [31][32][33][34][35][36] .…”

Section: Introductionmentioning

confidence: 99%

“…This transfer disturbs the original on-substrate alignment of MWCNTs which means that even if the annealing treatments improve any aspect of the MWCNTs, exploitation of the asymmetric nature of the VA-MWCNTs in a target application is not an option anymore. In contrast, VA-MWCNT carpets are often rigid enough and easily removable from the CVD substrates, if the thickness of the carpet is at least in the millimetre range 30,[38][39][40][41][42] . VA-MWCNT carpets of such thickness can be easily handled, treated, and still retain their original alignment.…”

Section: Introductionmentioning

confidence: 99%

“…The work by Fujisawa et al 32 highlights the effect of annealing on a bulk property of MWCNTs, e.g., their volume resistivity and their work is complementary to the aforementioned classic reports on the effect of annealing on structural properties (crystallinity, purity, etc.). Moreover, although prolonging the deposition time yields thicker carpets, the purity and crystallinity of individual tubes are reported to decrease during the course of CVD 29,30 . Hence, the post-synthesis treatments on large-area carpets of ultra-long MWCNTs, which are generally of lower quality compared to short powder-like MWCNTs produced by means of CVD, appears even more crucial to study.…”

Section: Introductionmentioning

confidence: 99%

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Ultra-stiff large-area carpets of carbon nanotubes

et al. 2016

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Herewith, we report the influence of post-synthesis heat treatment (≤2350 °C and plasma temperatures) on the crystal structure, defect density, purity, alignment and dispersibility of free-standing large-area (several cm(2)) carpets of ultra-long (several mm) vertically aligned multi-wall carbon nanotubes (VA-MWCNTs). VA-MWCNTs were produced in large quantities (20-30 g per batch) using a semi-scaled-up aerosol-assisted chemical vapour deposition (AACVD) setup. Electron and X-ray diffraction showed that the heat treatment at 2350 °C under inert atmosphere purifies, removes residual catalyst particles, and partially aligns adjacent single crystals (crystallites) in polycrystalline MWCNTs. The purification and improvement in the crystallites alignment within the MWCNTs resulted in reduced dispersibility of the VA-MWCNTs in liquid media. High-resolution microscopy revealed that the crystallinity is improved in scales of few tens of nanometres while the point defects remain largely unaffected. The heat treatment also had a marked benefit on the mechanical properties of the carpets. For the first time, we report compression moduli as high as 120 MPa for VA-MWCNT carpets, i.e. an order of magnitude higher than previously reported figures. The application of higher temperatures (arc-discharge plasma, ≥4000 °C) resulted in the formation of a novel graphite-matrix composite reinforced with CVD and arc-discharge-like carbon nanotubes.

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Aerosol-assisted chemical vapour deposition synthesis of multi-wall carbon nanotubes: III. Towards upscaling

Cited by 33 publications

References 44 publications

Solution based CVD of main group materials

Solution based CVD of main group materials

Characterization of high quality carbon nanotubes synthesized via Aerosol -CVD

Ultra-stiff large-area carpets of carbon nanotubes

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