EFFECT OF THE TEMPERATURE AND CATALYST LAYER OF MO/FE/AL ON GROWTH OF CARBON NANOTUBES

2010 ◽  
Vol 13 (3) ◽  
pp. 19-28
Author(s):  
Anh Tuan Nguyen ◽  
Hai Duy Dinh ◽  
Chien Mau Dang ◽  
Wooseok Song ◽  
Seong Kyu Kim ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor ◽  
Catalyst Layer ◽  
Effect Of Temperature ◽  
Metal Catalyst ◽  
Chemical Vapor Deposition Method ◽  
Dc Sputtering ◽  
Metal Layers

Carbon nanotubes (CNTs) were synthesized by thermal chemical vapor deposition method using a three layer Mo-Fe-Al metal catalyst. All metal layers were deposited by DC sputtering method. By analysis with SEM and Raman spectra, we investigated the effect of temperature and the role of Mo layer on the quality of synthesis CNTs.

Synthesis of Vertically Aligned Carbon Nanotubes by dc PECVD

2006 ◽  
Vol 326-328 ◽  
pp. 333-336
Author(s):  
Yun Young Bang ◽  
Tae Jin Je ◽  
Kyung Hyun Whang ◽  
Won Seok Chang
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
Carbon Source ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Catalyst Layer ◽  
Metal Catalyst ◽  
Synthesis Methods ◽  
Multi Wall Carbon Nanotubes ◽  
Vertically Aligned

Chemical vapor deposition (CVD) is one of the various synthesis methods that have been employed for CNT growth. In particular, Ren et al reported that large areas of vertically aligned multi-wall carbon nanotubes could be grown using plasma enhanced chemical vapor deposition (PECVD). In the present study, we synthesized aligned CNT arrays using a direct current (dc) PECVD system. The synthesis of CNTs requires a metal catalyst layer, etchant gas, and a carbon source. In this study, the substrate consisted of Si wafers with 10, 30, and 50 nm Ni-sputtered film. Ammonia (NH3) and acetylene (C2H2) were used as the etchant gases and carbon source, respectively. NH3 pretreatment was processed using a flow rate of 180 sccm for 10 min. CNTs were grown on pretreated substrates at 30% C2H2:NH3 flow ratios for 10 min. Carbon nanotubes with diameters ranging from 60 to 80 nanometers and lengths of about 2.7 μm were obtained. Vertical alignment of the carbon nanotubes was observed by FE-SEM.

scholarly journals EFFECT OF SYNTHESIZING PARAMETERS ON MORPHOLOGY AND DIAMETER OF CARBON NANOTUBES GROWN BY THERMAL CVD METHOD

2018 ◽  
Vol 54 (5A) ◽  
pp. 91
Author(s):  
Nguyen Cong Tu
Keyword(s):  
Carbon Nanotubes ◽  
Vapor Deposition ◽  
Reduction Process ◽  
Chemical Vapor ◽  
Substrate Material ◽  
Chemical Vapor Deposition Method ◽  
Deposition Method ◽  
Thermal Chemical Vapor Deposition ◽  
Cvd Method

Carbon nanotubes were synthesized by thermal chemical vapor deposition method. There were parameters of the synthesizing process which influence the morphology and quality of nanotubes such as substrate material, the topology of substrates, the reduction process, and growing temperature. The topology of substrate affected the uniform of nanotubes. The reduction process using NH3 reductant helped reducing diameter of carbon nanotubes. Growing temperature complexly modified the quality of carbon nanotubes.

Study on Growth of Carbon Nanotubes by Using Modified Bentonite as Catalyst

2010 ◽  
Vol 650 ◽  
pp. 330-335 ◽  
Author(s):  
Ju Gong Zheng ◽  
Quan Shui Chen ◽  
Xiao Dong Liu ◽  
Ting Yang
Keyword(s):  
Carbon Nanotubes ◽  
Treatment Process ◽  
Chemical Vapor ◽  
Metal Catalyst ◽  
Modified Bentonite ◽  
Industrial Synthesis ◽  
Catalytic Metal ◽  
Synthesis Of Carbon Nanotubes ◽  
Catalytic Capacity

Titanate modified bentonite could catalyze methane into synthesis carbon nanotubes at high temperature by thermal chemical vapor deposition. The element iron contained in bentonite acts as the catalytic metal of nanotubes. A conclusion was drawn that the quality and quantity of carbon nanotubes were best and largest respectively at 800 °C. If the temperature is higher than 900 °C,the quality of nanotubes would be bad. The catalytic capacity of modified bentonite would disappear below 700 °C. The catalyst is cheaper, and the treatment process of the catalyst is simpler than traditional metal catalyst , which may accelerate industrial synthesis of carbon nanotubes.

The Optimization of Vertically Aligned Carbon Nanotubes’ Synthesis According to the Selected Parameters

2018 ◽  
Vol 937 ◽  
pp. 9-16
Author(s):  
Ewelina Pabjańczyk-Wlazło ◽  
Yuma Suzuki ◽  
Jungo Onoda ◽  
Tetsuhide Shimizu ◽  
Ming Yang
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor ◽  
Annealing Duration ◽  
Chemical Vapor Deposition Method ◽  
Synthesis Time ◽  
Vertically Aligned Carbon Nanotubes ◽  
Force Microscopy ◽  
Aligned Carbon Nanotubes ◽  
Vertically Aligned

Vertically aligned carbon nanotubes (VACNTs or CNTs) were synthetized by thermal chemical vapor deposition method on the Si/SiO2 substrates, using Al/Fe as catalyst. In the present study, the influence of the annealing duration and synthesis time on the length, grow rate and quality of the VACNTs according to 9 different regimes was investigated. The outcomes of the study was observed using scanning electron microscope, atomic force microscopy and Raman spectroscopy analysis was utilized in order to evaluate the quality of the obtained nanotubes. Results have shown that the length of the VACNTs increases with the rise of annealing time, however only to a certain degree, after which the deterioration of the nanotubes occurs and the reduction of their length is noticeable.

scholarly journals Characterization of Carbon Nanotubes with TiO2 by the (CVD) Chemical Vapor Deposition Method

2018 ◽  
Vol 24 (S1) ◽  
pp. 1094-1095 ◽  
Author(s):  
Abraham A. Mejía ◽  
L. Béjar ◽  
C. Parra ◽  
C. Aguilar ◽  
A. Medina ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Chemical Vapor Deposition Method ◽  
Deposition Method
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