scholarly journals Evaluation of new processes to achieve a high yield of carbon nanotubes by CVD method

2012 ◽  
Vol 2 (1) ◽  
Author(s):  
Farshad Taleshi
Keyword(s):  
Carbon Nanotubes ◽  
High Yield ◽  
Cvd Method

EFFECT OF REACTION TEMPERATURE ON THE PRODUCTION OF CARBON NANOTUBES

NANO ◽  
2006 ◽  
Vol 01 (03) ◽  
pp. 251-257 ◽  
Author(s):  
A. A. MUATAZ ◽  
F. AHMADUN ◽  
C. GUAN ◽  
E. MAHDI ◽  
A. RINALDI
Keyword(s):  
Carbon Nanotubes ◽  
Reaction Temperature ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
High Yield ◽  
Cvd Method ◽  
Hydrogenation Reactions ◽  
Surface Decomposition ◽  
Yield And Purity ◽  
Catalyst Chemical Vapor Deposition

A floating catalyst chemical vapor deposition (FC-CVD) method was designed and fabricated to produce high quality and quantity carbon nanotubes. The reaction temperature was optimized to produce high yield and purity of the carbon nanotubes. The reaction temperatures were varied from 500–850°C. The result shows that carbon nanotubes were observed from 600°C to 850°C with maximum numbers and high purity at 850°C. The diameter range of CNTs varied from 2 to 55 nm. The results of the present investigation suggest that the observed changes in catalytic activity and selectivity accompanying an increase in temperature are probably due to major alterations in the distribution of atoms at the metal/gas interface. Thermodynamically, higher temperatures favor the surface decomposition of hydrocarbon rather than the hydrogenation reactions.

Facile synthesis and supercapacitor performances of nitrogen doped CNTs grown over mesoporous Fe/SBA-15 catalyst

2017 ◽  
Vol 41 (20) ◽  
pp. 11591-11599 ◽  
Author(s):  
R. Ragavan ◽  
A. Pandurangan
Keyword(s):  
Carbon Nanotubes ◽  
Electrode Material ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
High Yield ◽  
Facile Synthesis ◽  
Nitrogen Doped ◽  
Cvd Method ◽  
New Strategy ◽  
Nitrogen Doped Carbon

Herein, we report a new strategy to synthesize high-yield nitrogen-doped carbon nanotubes (NCNTs) using iron-supported SBA-15 as a catalystviathe chemical vapour deposition (CVD) method to utilize them as an electrode material for supercapacitors.

High-yield bamboo-shaped carbon nanotubes from cresol for electrochemical application

2008 ◽  
pp. 2046 ◽  
Author(s):  
Ruitao Lv ◽  
Lin Zou ◽  
Xuchun Gui ◽  
Feiyu Kang ◽  
Yanqiu Zhu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
High Yield ◽  
Electrochemical Application

Improved hydrothermal synthesis of MoS2 sheathed carbon nanotubes

2012 ◽  
Vol 66 (12) ◽  
Author(s):  
Jaciel Robles-Nuñez ◽  
Fernando Chiñas-Castillo ◽  
Manuel Sanchez-Rubio ◽  
Javier Lara-Romero ◽  
Rafael Huirache-Acuña ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Hydrothermal Synthesis ◽  
Reaction Temperature ◽  
High Yield ◽  
Hydrothermal Route ◽  
Simple Process ◽  
Toxic Materials ◽  
Resultant Material ◽  
Full Body

AbstractMoS2 sheathed carbon nanotubes have been successfully synthesized using a hydrothermal route under controlled conditions. The resultant material was studied by XRD, EDS, HRTEM, and Raman spectroscopy. Advantages of the preparation presented here compared to other methods are: a) lower reaction temperature, b) high yield of sheathed nanotubes including ends and full body, c) simple process with non-toxic materials, and d) no damage inflicted to nanotubes.

Unravelling the Mechanisms Behind Mixed Catalysts for the High Yield Production of Single-Walled Carbon Nanotubes

ACS Nano ◽  
2009 ◽  
Vol 3 (12) ◽  
pp. 3839-3844 ◽  
Author(s):  
Sailaja Tetali ◽  
Mujtaba Zaka ◽  
Ronny Schönfelder ◽  
Alicja Bachmatiuk ◽  
Felix Börrnert ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
High Yield ◽  
Single Walled Carbon ◽  
Yield Production ◽  
Walled Carbon Nanotubes ◽  
High Yield Production

Influence Analysis of Sampling Time for Synthesis of Carbon Nanotubes in the V-Type Pyrolysis Flame

2011 ◽  
Vol 221 ◽  
pp. 235-239 ◽  
Author(s):  
Yuan Chao Liu ◽  
Bao Min Sun ◽  
Zhao Yong Ding
Keyword(s):  
Carbon Nanotubes ◽  
Electron Microscope ◽  
Experimental System ◽  
Growth Period ◽  
Sampling Time ◽  
High Yield ◽  
Spray Pyrolysis Method ◽  
Transmission Electron ◽  
Novel Method ◽  
Synthesis Of Carbon Nanotubes

Synthesis of carbon nanotubes from V-type pyrolysis flame is a kind of novel method. It needs simple laboratory equipments and normal atmosphere pressure. The V-type pyrolysis flame experimental system is introduced. Carbon source is the carbon monoxide and heat source is from acetylene/air premixed flame. Pentacarbonyl iron, served as catalyst, is transported by spray- pyrolysis method into the flame. The carbon nanotubes were characterized by scanning electron microscope and transmission electron microscope. This study aims to find the formation rule of carbon nanotubes from the V-type pyrolysis flame in different sampling times. The carbon nanotubes with less impurity and high yield were captured successfully in the V-type pyrolysis flame. The diameter of carbon nanotubes was approximate between 10nm and 20nm, and its length was dozens of microns. When the sampling time was below 3 minutes, the growth of carbon nanotubes came into the preparation growth period. The length of the carbon nanotubes increased gradually and the diameter had no obvious change with the extension of sampling time. When the sampling time was continued to the 5th minute, the growth of carbon nanotubes came into the exuberant growth period. The carbon nanotubes growth was finished within 5minutes. Longer sampling time was meaningless after the carbon nanotubes formation.

Mass production of multi-wall carbon nanotubes by metal dusting process with high yield

2011 ◽  
Vol 46 (5) ◽  
pp. 716-721 ◽  
Author(s):  
H. Ghorbani ◽  
A.M. Rashidi ◽  
S. Rastegari ◽  
S. Mirdamadi ◽  
M. Alaei
Keyword(s):  
Carbon Nanotubes ◽  
Mass Production ◽  
High Yield ◽  
Metal Dusting ◽  
Multi Wall Carbon Nanotubes

Preferential Growth of Carbon Nanotubes/Nanofibers Using Lithographically Patterned Catalysts

2001 ◽  
Vol 675 ◽  
Author(s):  
K. B. K. Teo ◽  
M. Chhowalla ◽  
G. A. J. Amaratunga ◽  
W. I. Milne ◽  
G. Pirio ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Amorphous Carbon ◽  
Deposition Process ◽  
High Yield ◽  
Full Potential ◽  
Carbon Nanofibres ◽  
Preferential Growth ◽  
Plasma Decomposition

ABSTRACTIn order to utilise the full potential of carbon nanotubes/nanofibers, it is necessary to be able to synthesize well aligned nanotubes/nanofibres at desired locations on a substrate. This paper examines the preferential growth of aligned carbon nanofibres by PECVD using lithographically patterned catalysts. In the PECVD deposition process, amorphous carbon is deposited together with the nanotubes due to the plasma decomposition of the carbon feed gas, in this case, acetylene. The challenge is to uniformly nucleate nanotubes and reduce the unwanted amorphous carbon on both the patterned and unpatterned areas. An etching gas (ammonia) is thus also incorporated into the PECVD process and by appropriately balancing the acetylene to ammonia ratio, conditions are obtained where no unwanted amorphous carbon is deposited. In this paper, we demonstrate high yield, uniform, ‘clean’ and preferential growth of vertically aligned nanotubes using PECVD.

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