scholarly journals Carbon nanotubes synthesis using carbonization of pretreated rice straw through chemical vapor deposition of camphor

RSC Advances ◽  
2017 ◽  
Vol 7 (45) ◽  
pp. 28535-28541 ◽  
Author(s):  
Nady A. Fathy
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
Rice Straw ◽  
Vapor Deposition ◽  
Low Cost ◽  
Chemical Vapor ◽  
Catalyst Supports ◽  
Renewable Biomass ◽  
Biomass Resources

There is a pressing demand to prepare low-cost carbon nanotubes (CNTs) from renewable biomass resources as cheap carbon precursors and catalyst supports during chemical vapor deposition (CVD).

Numerical Model of Template-Based Chemical Vapor Deposition Processes to Manufacture Carbon Nanotubes for Biological Devices

2015 ◽  
Author(s):  
Yashar Seyed Vahedein ◽  
Michael G. Schrlau
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
Process Parameters ◽  
Flow Rate ◽  
Vapor Deposition ◽  
Carbon Nanostructures ◽  
Numerical Models ◽  
Fluid Dynamic ◽  
Low Cost ◽  
Chemical Vapor

Carbon nanotubes (CNTs) hold significant promise in the fields of efficient drug delivery and bio-sensing for disease treatment because of their unique properties. In our lab, single and arrayed CNT-tipped devices are manufactured by deposition of carbon on the heated surfaces of templates using chemical vapor deposition (Template-Based Chemical Vapor Deposition, TB-CVD). Experimental results show CNT formation in templates is controlled by TB-CVD process parameters such as flow rate and temperature. However, there is a need for a more comprehensive and low cost way to characterize the flow in the furnace in order to understand how process parameters may affect CNT formation. In this report, 2D and 3D numerical models with Quadrilateral grids were developed using computational fluid dynamic (CFD) commercial codes. Velocity patterns and flow regimes in the tube were compared with experimental data. In addition, statistical techniques were employed to study temperature profiles and velocity patterns in the furnace as a function of flow rate. The outcome of this work will help to elucidate the TB-CVD process and facilitate the efficient manufacture of carbon nanostructures from a variety of templates. The results are broadly applicable to the manufacturing of CNTs and other nanostructured devices used in energy and biomedical fields, including CNT-based devices used in biological applications.

Numerical Investigation of Thermofluid Flow in a Chemical Vapor Deposition Furnace Utilized to Manufacture Template-Synthesized Carbon Nanotubes

2016 ◽  
Vol 138 (10) ◽  
Author(s):  
Yashar Seyed Vahedein ◽  
Michael G. Schrlau
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
Process Parameters ◽  
Vapor Deposition ◽  
Numerical Models ◽  
Fluid Dynamic ◽  
Low Cost ◽  
Chemical Vapor ◽  
Computational Time ◽  
Anodized Aluminum

Template-based chemical vapor deposition (TB-CVD) is a versatile technique for manufacturing carbon nanotubes (CNTs) or CNT-based devices for various applications. In this process, carbon is deposited by thermal decomposition of a carbon-based precursor gas inside the nanoscopic cylindrical pores of anodized aluminum oxide (AAO) templates to form CNTs. Experimental results show that CNT formation in templates is controlled by TB-CVD process parameters, such as time, temperature, and flow rate. However, optimization of this process is done empirically, requiring tremendous time and effort. Moreover, there is a need for a more comprehensive and low cost way to characterize the flow in the furnace in order to understand how process parameters may affect CNT formation. In this report, we describe the development of four, 3D numerical models (73 < Re < 1100), each varying in complexity, to elucidate the thermofluid behavior in the TB-CVD process. Using computational fluid dynamic (CFD) commercial codes, the four models are compared to determine how the presence of the template and boat, composition of the precursor gas, and consumption of species at the template surface affect the temperature profiles, velocity fields, mixed convection, and strength of circulations in the system. The benefits and shortcomings of each model, as well as a comparison of model accuracy and computational time, are presented. Due to limited data, simulation results are validated by experiments and visual observations of the flow structure whenever possible. Decent agreement between experimental data and simulation supports the reliability of the simulation.

Synthesis and characterization of low-cost carbon nanotubes by chemical vapor deposition for aluminum removal from aqueous solution

2021 ◽  
Vol 214 ◽  
pp. 440-451
Author(s):  
Alfarooq O. Basheer ◽  
Marlia M. Hanafiah ◽  
Mohammed Abdulhakim Alsaadi ◽  
Wan Zuhairi Wan Yaacob ◽  
Y. Al-Douri ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Low Cost ◽  
Chemical Vapor ◽  
Synthesis And Characterization

Growth of Carbon Nanotubes by Combustion of Ethyl Alcohol

2007 ◽  
Vol 121-123 ◽  
pp. 145-148 ◽  
Author(s):  
Jin Cheng ◽  
Xiao Ping Zou ◽  
Li Kun Wang
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
Ethyl Alcohol ◽  
Vapor Deposition ◽  
Arc Discharge ◽  
Low Cost ◽  
Chemical Vapor ◽  
Catalyst Precursor ◽  
Synthesis Conditions ◽  
Simple Growth

Many preparations of carbon nanotubes have been developed in the last decade, such as arc discharge, plasma-enhanced chemical vapor deposition, simple thermal chemical vapor deposition by pyrolysis of ethyl alcohol, etc. Here we present a simple growth technique of carbon nanotubes by combustion of ethyl alcohol. Pt filament can be employed as substrate, ethyl alcohol as carbon source, and iron nitrate as catalyst precursor. We have characterized the morphology of carbon nanotubes at the different synthesis conditions by both SEM and TEM. In our experiment, we also use other metal as substrate, such as Cu, top of pin, and other catalyst precursor of different concentration, such as nickel nitrate. This technique has some advantages, such as low cost, large production, and flexible reaction conditions, etc. We can use this technique to synthesize carbon nanotubes on metal substrate directly. So this technique has protential applications for fabricating nano-electrical devices.

A Review of Three Major Factors Controlling Carbon Nanotubes Synthesis from the Floating Catalyst Chemical Vapor Deposition

Nano LIFE ◽  
2019 ◽  
Vol 09 (04) ◽  
pp. 1930002 ◽  
Author(s):  
Daniel Rui Chen ◽  
Megha Chitranshi ◽  
Mark Schulz ◽  
Vesselin Shanov
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
High Temperature ◽  
Vapor Deposition ◽  
Mass Production ◽  
Arc Discharge ◽  
Low Cost ◽  
Chemical Vapor ◽  
Major Factors ◽  
Catalyst Chemical Vapor Deposition

After the discovery of carbon nanotubes (CNTs) by Sumio Iijima in 1991, several methods have been developed to synthesize them. High-temperature techniques, such as laser ablation and arc discharge, are now replaced by a low-temperature technique like chemical vapor deposition (CVD). Floating catalyst chemical vapor deposition (FCCVD) method is extensively researched due to its ease of fabrication, mass production at low cost and high purity output. The motive of this paper is to discuss the influence of three major factors on the growth of CNTs using the FCCVD method, which can help us better understand the process of FCCVD as well as the potential challenges faced by this method.

Cobalt supported on carbon nanotubes for methane chemical vapor deposition towards carbon nanotubes

2021 ◽  
Author(s):  
Laura Esteves ◽  
Hugo Alvarenga Oliveira ◽  
Y. T. Xing ◽  
Fabio Barboza Passos
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
Heterogeneous Catalysis ◽  
Vapor Deposition ◽  
Supported Catalysts ◽  
Chemical Vapor

Carbon nanotubes (CNT) application in heterogeneous catalysis has been attracting growing interest. However, the use of CNT-supported catalysts in the chemical vapor deposition for the production of new CNT is...

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