Evaluation of the optimal carrier gas flow rate for the carbon nanotubes growth

Kurenya, A. N.; Gorodetskiy, D. V.; Архипов, В. Е.; Окотруб, А. В.

doi:10.1134/s1063785013030085

Cited by 11 publications

(4 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…FESEM images confirm that well-aligned CNTs with three different diameters were synthesized. As the flow rate decreases, the CNTs gradually thicken [ 22 ]. The duration of carrier gas feeding and its flow rate into the reaction zone are key parameters controlling the CNTs diameter [ 18 ].…”

Section: Resultsmentioning

confidence: 99%

Fast Synthesis of Multilayer Carbon Nanotubes from Camphor Oil as an Energy Storage Material

TermehYousefi¹,

Kawasaki

Rouhi

et al. 2014

BioMed Research International

View full text Add to dashboard Cite

Among the wide range of renewable energy sources, the ever-increasing demand for electricity storage represents an emerging challenge. Utilizing carbon nanotubes (CNTs) for energy storage is closely being scrutinized due to the promising performance on top of their extraordinary features. In this work, well-aligned multilayer carbon nanotubes were successfully synthesized on a porous silicon (PSi) substrate in a fast process using renewable natural essential oil via chemical vapor deposition (CVD). Considering the influx of vaporized multilayer vertical carbon nanotubes (MVCNTs) to the PSi, the diameter distribution increased as the flow rate decreased in the reactor. Raman spectroscopy results indicated that the crystalline quality of the carbon nanotubes structure exhibits no major variation despite changes in the flow rate. Fourier transform infrared (FT-IR) spectra confirmed the hexagonal structure of the carbon nanotubes because of the presence of a peak corresponding to the carbon double bond. Field emission scanning electron microscopy (FESEM) images showed multilayer nanotubes, each with different diameters with long and straight multiwall tubes. Moreover, the temperature programmed desorption (TPD) method has been used to analyze the hydrogen storage properties of MVCNTs, which indicates that hydrogen adsorption sites exist on the synthesized multilayer CNTs.

show abstract

Section: Resultsmentioning

confidence: 99%

Fast Synthesis of Multilayer Carbon Nanotubes from Camphor Oil as an Energy Storage Material

TermehYousefi¹,

Kawasaki

Rouhi

et al. 2014

BioMed Research International

View full text Add to dashboard Cite

show abstract

“…The structure of CNT arrays depends on a large number of physical and chemical parameters during synthesis [ 11 , 12 , 13 , 14 , 15 ]. Even small deviations in the synthesis parameters from their optimal values lead to defective CNTs and to the formation of amorphous carbon [ 16 ], the quantity of which can increase during synthesis [ 17 ]. The deposition of reaction products on the CNT surface can significantly affect the cathode emission characteristics [ 1 , 3 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Plasma Treatment of Aligned Multi-Walled Carbon Nanotube Arrays for Improvement of Field Emission Properties

et al. 2020

View full text Add to dashboard Cite

Vertically aligned carbon nanotube (CNT) arrays show potential for the development of planar low-voltage emission cathodes. The characteristics of cathodes can be improved by modifying their surface, e.g., by hydrogen plasma treatment, as was performed in this work. The surface of multi-walled CNT arrays grown on silicon substrates from toluene and ferrocene using catalytic chemical vapor deposition was treated in a high-pressure (~104 Pa) microwave reactor. The structure, composition, and current-voltage characteristics of the arrays were studied before and after hydrogen plasma treatment at various power values and durations. CNT tips were destroyed and catalytic iron was released from the CNT channels. The etching rate was influenced by iron particles that formed on the array surface. The lower emission threshold in the plasma-treated arrays than in the initial sample is explained by the amplification factor of the local electric field increasing due to graphene structures of unfolded nanotube layers that formed at the CNT tips.

show abstract

“…The argon flow delivered vapors to the substrates. The main synthesis parameters were studied earlier [ 53 ]. The optimal conditions for our setup are a temperature in the synthesis zone of 800 °C and a feed rate of the ferrocene–toluene solution of 15 mL h −1 .…”

Section: Methodsmentioning

confidence: 99%

Distribution of Iron Nanoparticles in Arrays of Vertically Aligned Carbon Nanotubes Grown by Chemical Vapor Deposition

et al. 2022

View full text Add to dashboard Cite

Arrays of aligned carbon nanotubes (CNTs) are anisotropic nanomaterials possessing a high length-to-diameter aspect ratio, channels passing through the array, and mechanical strength along with flexibility. The arrays are produced in one step using aerosol-assisted catalytic chemical vapor deposition (CCVD), where a mixture of carbon and metal sources is fed into the hot zone of the reactor. Metal nanoparticles catalyze the growth of CNTs and, during synthesis, are partially captured into the internal cavity of CNTs. In this work, we considered various stages of multi-walled CNT (MWCNT) growth on silicon substrates from a ferrocene–toluene mixture and estimated the amount of iron in the array. The study showed that although the mixture of precursors supplies evenly to the reactor, the iron content in the upper part of the array is lower and increases toward the substrate. The size of carbon-encapsulated iron-based nanoparticles is 20–30 nm, and, according to X-ray diffraction data, most of them are iron carbide Fe3C. The reasons for the gradient distribution of iron nanoparticles in MWCNT arrays were considered, and the possibilities of controlling their distribution were evaluated.

show abstract

Evaluation of the optimal carrier gas flow rate for the carbon nanotubes growth

Cited by 11 publications

References 11 publications

Fast Synthesis of Multilayer Carbon Nanotubes from Camphor Oil as an Energy Storage Material

Fast Synthesis of Multilayer Carbon Nanotubes from Camphor Oil as an Energy Storage Material

Hydrogen Plasma Treatment of Aligned Multi-Walled Carbon Nanotube Arrays for Improvement of Field Emission Properties

Distribution of Iron Nanoparticles in Arrays of Vertically Aligned Carbon Nanotubes Grown by Chemical Vapor Deposition

Contact Info

Product

Resources

About