in this presentation i mentioned about black carbon nanotubes which are an active material that have used in large quantity in today industries, i write about the unique properties of black carbon nanotubes and the steps of synthesis by CVD.

1. Black
Carbon
nanotubes
Presented by: Muhammad Hashami
Master student 2023
Kazakh National Named
Al-Farabi university

2. contants
• Brief introduction
• Characterizes
• Applications
• Obtaining processes
• Conclusion

3. Black Carbon nanotubes
Carbon black nanoparticles are a
type of nanomaterial composed
primarily of carbon atoms.
produced from incomplete
combustion or thermal
decomposition of hydrocarbons,
these nanoparticles have a high
surface area, which improved
unique properties and allow
using in numerous applications.

4. Characteristics
• High Surface Area:
Carbon black nanoparticles have high
surface area, which promoted their
adsorption capacity and reactivity..
• conductivity:
They are highly electric conductive
and usually used as conductive fillers
in numerous applications.

5. Characteristics
• Thermal Stability:
Due to excellent thermal stability
can withstand high temperatures.
• Low Cost:
Carbon black is inexpensive to
produce, it means a cost-effective
material for applications.
• Reinforcing Filler:
Carbon black is used as a reinforcing filler in
rubber products, providing improved coting
resistance.

6. Characteristics
• Pigmentation:
Carbon black can use as a black
pigment in inks, and plastics.
• UV Absorption:
carbon black have UV-absorbing properties,
they are suitable for use in UV protection in
some applications.

7. Applications
• Ink and Pigment Industry:
used as a black pigment in
inks, paints.
• Rubber Industry:
As a reinforcing filler in tire manufacturing, to
improve coting resistance, and mechanical
characterizes.

8. Synthesis methods
Obtaining black carbon nanotubes is a complex and highly controlled process, the choice
of method often depends on the desired type (single-walled or multi-walled), quality, and
quantity of nanotubes needed.
• Chemical Vapor Deposition (CVD)
• Floating Catalyst Chemical Vapor Deposition
• Arc Discharge
• Laser Ablation
• Chemical Reduction of Precursors
• High-Pressure Carbon Monoxide (HiPco) Method
• Chemical Synthesis from Carbon Compounds
• Plasma Enhanced Chemical Vapor Deposition (PECVD)
synthesis
CVD
ARC
Laser
ablation
Chemical
reduction
HPCM
CSCC
PECVD

9. CVD Process
Synthesis of black carbon nanotubes by CVD Method: The Chemical Vapor
Deposition (CVD) method is the growth of CNTs on a substrate using a carbon-
containing precursor gas to obtain black carbon nanotubes (CNTs). Here's a simplified
step-by-step process, parameters, catalysts, and conditions.
Materials and Equipment:
 Substrate (commonly silicon wafers or quartz)
 Carbon-containing precursor gas (e.g., methane, ethylene, or acetylene)
 Catalyst material (e.g., iron, nickel, or cobalt nanoparticles)
 CVD reactor or furnace
 Vacuum pump or inert gas source
 Heating elements
 Temperature control system
 Hydrogen or other carrier gas
 Cooling system

10. CVD Process
Synthesis of black carbon nanotubes by CVD Method:
• Substrate Preparation:
First The substrate is cleaned, Common substrates include silicon
wafers, quartz, or other materials that can withstand high temperatures.
• Catalyst Deposition:
Catalyst nanoparticles (commonly iron, nickel, or cobalt) are deposited
onto the substrate. The catalyst particles serve as nucleation sites for
CNT growth.
• Loading into the CVD Reactor:
prepared substrate and catalyst nanoparticles loading into the CVD reactor.
• leaning and Evacuation:
to create a clean and controlled environment inside the reactor. inter
an inert gas (e.g., argon) or vacuumed to remove air and impurities.

11. CVD Process
Synthesis of black carbon nanotubes by CVD Method:
• Heating and Introduction of Precursor Gas:
The reactor is heated to the desired growth temperature, typically from (600°C -
900°C). in the presence of a carrier gas (commonly hydrogen). The precursor gas
(e.g., methane, ethylene, or acetylene) is introduced into the reactor
• Catalyst Activation:
After heating, the catalyst nanoparticles become active, and they decompose
the precursor gas into carbon atoms.
• Carbon Nanotube Growth:
Carbon atoms diffuse to the catalyst nanoparticles and carbon nanotubes forming
starts, then grow The nanotubes in a vertically aligned manner on the substrate.
Growth Time Control: The growth time is controlled to achieve the
desired length and density of the CNTs. Longer growth times is related to
synthesis longer nanotubes.

12. CVD Process
Synthesis of black carbon nanotubes by CVD Method:
• Cooling:
when synthesis stops, The reactor is gradually cooled.
• Removal from Reactor:
After the reactor has cooled clean the reactor from residence gases,and
remove the CNT-coated substrate.
• Cooling: Characterization and Post-Processing:
To assess the quality and properties of product, use techniques like electron
microscopy and Raman spectroscopy. Post-processing steps, such as purification
and functionalization, depending on the application requirements.

13. CVD Process
Synthesis of black carbon nanotubes by CVD Method:

14. conclusion
Black carbon nanotubes are one of the carbon-containing
compounds obtained through various methods. Black carbon
nanotubes have special properties such as heat resistance, UV
absorption, electrical conductivity, and so on. It has a wide range
of applications, it is widely used in the industry of tires, batteries,
paints and coatings. is In this method, carbon-containing
materials are vaporized and then carbon is deposited through a
chemical reaction to obtain carbon nanotubes. Since carbon
nanotubes have a large role in the industry, it is necessary to
conduct further research to obtain them from easy and cheap
sources so that we can obtain large quantities and good quality
carbon nanotubes in a short time. .

15. References
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Chai, "Role of Reaction and Factors of Carbon Nanotubes Growth in Chemical Vapour
Decomposition Process Using Methane—A Highlight", Journal of Nanomaterials, vol.
2010, Article ID 395191, 11 pages, 2010. https://doi.org/10.1155/2010/39519
[2] S. O. Mirabootalebi , Ghasem Akbari . (2017). Methods for synthesis of carbon
nanotubes-Review. https://api.semanticscholar.org/CorpusID:163163394
[3] Chitranshi, Megha, Anuptha Pujari, Vianessa Ng, Daniel Chen, Devika Chauhan,
Ronald Hudepohl, Motahareh Saleminik, Sung Yong Kim, Ashley Kubley, Vesselin
Shanov, and et al. 2020. "Carbon Nanotube Sheet-Synthesis and
Applications" Nanomaterials 10, no. 10: 2023. https://doi.org/10.3390/nano10102023
[4] Shanmugam K, Manivannan J, Manjuladevi M. Stupendous Nanomaterials: Carbon
Nanotubes Synthesis, Characterization, and Applications [Internet]. Nanomaterials -
Toxicity, Human Health and Environment. IntechOpen; 2020. Available from:
http://dx.doi.org/10.5772/intechopen.90318