Vertically Aligned Single-Walled Carbon Nanotube Growth from Ir Catalysts by Alcohol Gas Source Method

MRS Advances ◽  
2019 ◽  
Vol 4 (3-4) ◽  
pp. 225-230
Author(s):  
Takuya Okada ◽  
Takahiro Saida ◽  
Shigeya Naritsuka ◽  
Takahiro Maruyama
Keyword(s):  
Chemical Vapor ◽  
Growth Time ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Si Substrates ◽  
Gas Source ◽  
Vertically Aligned ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth ◽  
Walled Carbon Nanotubes

Abstract:We demonstrated that single-walled carbon nanotubes (SWCNTs) grew from Ir catalysts by an alcohol catalytic chemical vapor deposition (ACCVD) method using a gas source-type CVD system. At an ethanol pressure of 1×10−1 Pa at 800°C, vertically aligned SWCNTs (VA-SWCNTs) were grown on SiO2/Si substrates. As the growth time became longer, the VA-SWCNT became thicker, and it reached almost 5 μm for a growth time of 180 min. The Raman spectroscopy results showed that the diameters of the grown SWCNTs were mainly distributed below 1.1 nm, indicating that the SWCNTs grown from Ir catalysts had small diameters compared with those from other metal catalysts.

Single-Walled Carbon Nanotube Growth using Al2Ox Buffer Layer at Low Temperature by Alcohol Gas Source Method

2009 ◽  
Vol 1204 ◽  
Author(s):  
Kuninori Sato ◽  
Takahiro Maruyama ◽  
Shigeya Naritsuka
Keyword(s):  
Aluminum Oxide ◽  
Buffer Layer ◽  
Buffer Layers ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Gas Source ◽  
Aluminum Oxide Layer ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth ◽  
Walled Carbon Nanotubes

AbstractAluminum oxide (Al2Ox) buffer layers were employed to grow single-walled carbon nanotubes (SWNTs) at 400°C using an alcohol gas source and a Co catalyst. By optimizing the thickness of the aluminum oxide layer, the SWNT yield was enhanced by a factor of several times. In addition, SWNT growth at 350°C was realized on the Al2Ox buffer layer by this method. Raman measurements at various excitation wavelengths suggest that a Al2Ox buffer layer preferentially enhances the growth of SWNTs with larger diameters (>1 nm).

scholarly journals ATOMIC HYDROGEN-DRIVEN SIZE CONTROL OF CATALYTIC NANOPARTICLES FOR SINGLE-WALLED CARBON NANOTUBE GROWTH

NANO ◽  
2008 ◽  
Vol 03 (03) ◽  
pp. 145-153 ◽  
Author(s):  
HEE JIN JEONG ◽  
LAURENT EUDE ◽  
MANOHARAN GOWTHAM ◽  
BERND MARQUARDT ◽  
SUNG HUN LIM ◽  
...  
Keyword(s):  
Low Temperature ◽  
Atomic Hydrogen ◽  
Size Control ◽  
Chemical Vapor ◽  
Catalyst Layer ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth ◽  
Walled Carbon Nanotubes

The effects of an atomic hydrogen ( H at ) pretreatment of the catalyst layer on the low temperature growth of single-walled carbon nanotubes (SWCNTs) have been investigated using a modified catalytic chemical vapor deposition system. Well-defined and isolated individual Fe nanoparticles as a catalyst are successfully formed on the defects with high trapping energy which are created on the Al 2 O 3 surface by H at pretreatment, yielding highly dense SWCNTs. The pretreatment mechanism of H at , compared to H 2 , is also discussed. It was also found that the quality of SWCNTs can be enhanced when H at is flowed with CH 4 during nanotubes growth at low temperature. In this case, the undesired carbon products and defects on catalyst seeds and nanotube walls can be selectively removed by H at . Therefore it is essential to use H at in the pretreatment stage for increasing catalytic activity and to keep the size of nanoparticles in the nm range. H at can also be employed in growth stage for enhancing SWCNTs quality and density at low temperature.

Temperature and time dependence study of single-walled carbon nanotube growth by catalytic chemical vapor deposition

Carbon ◽  
2010 ◽  
Vol 48 (4) ◽  
pp. 1279-1288 ◽  
Author(s):  
Charlotte T.M. Kwok ◽  
Brandon J. Reizman ◽  
Daniel E. Agnew ◽  
Gurjit S. Sandhu ◽  
J. Weistroffer ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Carbon Nanotube ◽  
Time Dependence ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Single Walled Carbon Nanotube ◽  
Catalytic Chemical Vapor Deposition ◽  
Single Walled Carbon ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth

scholarly journals Vertically Aligned, Small-diameter Single-walled Carbon Nanotube Growth from Ir Catalysts

2020 ◽  
Vol 63 (9) ◽  
pp. 488-491
Author(s):  
Takahiro MARUYAMA ◽  
Takuya OKADA ◽  
Kamal Prasad SHARMA ◽  
Tomoko SUZUKI ◽  
Takahiro SAIDA ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Small Diameter ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Vertically Aligned ◽  
Carbon Nanotube Growth ◽  
Nanotube Growth

Process Design for the Flow of Ethanol Chemical Vapor Deposition Grown Vertically Aligned Single Walled Carbon Nanotubes

2012 ◽  
Author(s):  
Hatem Abuhimd ◽  
Abe Zeid ◽  
Yung Joon Jung ◽  
Sagar Kamarthi
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
Flow Rate ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Single Walled Carbon Nanotubes ◽  
Growth Time ◽  
Single Walled Carbon ◽  
Vertically Aligned ◽  
Walled Carbon Nanotubes

Carbon nanotubes (CNTs) have received much attention from both the scientific and industrial communities due to their structural properties and unique morphology. There has also been growing interest in vertically aligned single walled carbon nanotubes (VA-SWNTs) because of their suitability for building devices such as solar cells and nanomembrane. Various methods including chemical vapor deposition (CVD) have been developed for growing VA-SWNTs. Among them is alcohol catalytic CVD which is well known for its economic viability, comprehensive substrates selectivity and good yield of VA-SWNTs. This work studies the length assurance of VA-SWNTs growth by an experimental design and an artificial neural network (ANN) metamodel. Process analysis shows that the interaction between gas flow rate and growth time are the most significant input factors. In addition, with high probability flow rate less than 150 sccm and a growth time of 20 minutes are suitable for the repeatability of medium length VA-SWNTs.

Growth Mechanism of Single-Walled Carbon Nanotubes from Pt Catalysts by Alcohol Catalytic CVD

2015 ◽  
Vol 1752 ◽  
pp. 27-30
Author(s):  
Takahiro Maruyama ◽  
Hiroki Kondo ◽  
Akinari Kozawa ◽  
Takahiro Saida ◽  
Shigeya Naritsuka ◽  
...  
Keyword(s):  
Growth Mechanism ◽  
Photoelectron Spectroscopy ◽  
Chemical Vapor ◽  
Pt Catalyst ◽  
Pt Catalysts ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Gas Source ◽  
Transmission Electron ◽  
Walled Carbon Nanotubes

ABSTRACTSingle-walled carbon nanotube (SWCNT) growth from Pt catalysts by an alcohol gas source method, a type of cold-wall chemical vapor deposition (CVD), was investigated. Raman results showed that the diameters of SWCNTs grown from Pt were below 1.2 nm, while transmission electron microscopy (TEM) showed that the diameters of most Pt catalyst particles were above 1.2 nm. This suggests that SWCNT diameters were smaller than Pt catalysts particles. X-ray photoelectron spectroscopy measurements showed that reduction of Pt particles occurred during the SWCNT growth. Based on these experimental data, growth mechanism of SWCNTs was discussed.

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