Liquid-Phase Synthesis of Carbon Nanotubes from Alcohols

2007 ◽  
Vol 350 ◽  
pp. 19-22 ◽  
Author(s):  
Kiyofumi Yamagiwa ◽  
Yuriko Iwao ◽  
Masafumi Mikami ◽  
Tsuneharu Takeuchi ◽  
Morihiro Saito ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Steel Substrate ◽  
Low Cost ◽  
Carbon Sources ◽  
Molecular Structures ◽  
Primary Alcohols ◽  
Distinctive Features ◽  
One Step ◽  
Vertically Aligned ◽  
Synthesis Of Carbon Nanotubes

Vertically aligned carbon nanotubes (CNTs) were grown on a stainless steel substrate (SUS304) by resistance-heating method in alcohols containing homogeneously dissolved cobaltocene Co(C5H5)2 as a catalyst source. Straight-chain primary alcohols, 1,2-ethanediol and cyclohexanol were used as carbon sources to examine the effects of the molecular structures on the morphology of the aligned CNTs. Methanol brought the best purity and alignment of CNTs of all the alcohols. The CNTs from 1,2-ethanediol was worse in the purity than those from ethanol with the same number of carbon atoms. The CNTs from cyclohexanol had a better purity than those from 1-hexanol. Distinctive features of this method are simple, low cost and a one-step process involving none of vacuum processes and catalyst preparation processes.

Growth and Characterization of Cobalt-filled Carbon Nanotubes Prepared by a Simple Catalytic Method

2003 ◽  
Vol 776 ◽  
Author(s):  
Xicheng Ma ◽  
Yuanhua Cai ◽  
Xia Li ◽  
Ning Lun ◽  
Shulin Wen
Keyword(s):  
Carbon Nanotubes ◽  
Metallic Nanoparticles ◽  
Low Cost ◽  
Catalytic Method ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
High Resolution Tem ◽  
One Step

AbstractHigh-quality cobalt-filled carbon nanotubes (CNTs) were prepared in situ in the decomposition of benzene over Co/silica-gel nano-scale catalysts. Unlike the previous reports, the catalysts needn't be pre-reduced prior to the forming of Co-filled CNTs, thus the advantage of this method is that Co-filled CNTs can be produced in one step, at a relatively low cost. Transmission electron microscopy (TEM) investigation showed that the products contained abundance of CNTs and most of them were filled with metallic nanoparticles or nanorods. High-resolution TEM (HRTEM), selected area electron diffraction (SAED) patterns and energy dispersive X-ray spectroscopy (EDS) confirmed the presence of Co inside the nanotubes. The encapsulated Co was further identified always as high temperature alpha-Co phase with fcc structure, which frequently consists of twinned boundaries and stacking faults. Based on the experimental results, a possible growth mechanism of the Co-filled CNTs was proposed.

Synthesis of carbon nanotubes from solid carbon sources by direct microwave irradiation

Carbon ◽  
2006 ◽  
Vol 44 (7) ◽  
pp. 1339-1343 ◽  
Author(s):  
Dong-Myung Yoon ◽  
Beom-Jin Yoon ◽  
Kun-Hong Lee ◽  
Hyung Seok Kim ◽  
Chan Gyung Park
Keyword(s):  
Carbon Nanotubes ◽  
Microwave Irradiation ◽  
Carbon Sources ◽  
Solid Carbon ◽  
Synthesis Of Carbon Nanotubes

One-step synthesis of carbon nanotubes with Ni nanoparticles as a catalyst by the microwave-assisted polyol method

2011 ◽  
Vol 509 (6) ◽  
pp. 2829-2832 ◽  
Author(s):  
Xian-song Liu ◽  
Feng Hu ◽  
De-ru Zhu ◽  
Dao-ning Jia ◽  
Peng-peng Wang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Polyol Method ◽  
Ni Nanoparticles ◽  
Microwave Assisted ◽  
One Step ◽  
Synthesis Of Carbon Nanotubes

Exonuclease-assisted target recycling for ultrasensitive electrochemical detection of microRNA at vertically aligned carbon nanotubes

Nanoscale ◽  
2019 ◽  
Vol 11 (23) ◽  
pp. 11262-11269 ◽  
Author(s):  
Zhichao Chen ◽  
Yiming Xie ◽  
Wan Huang ◽  
Chuanying Qin ◽  
Aimin Yu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrochemical Detection ◽  
Target Recycling ◽  
Vertically Aligned Carbon Nanotubes ◽  
Aligned Carbon Nanotubes ◽  
One Step ◽  
Vertically Aligned ◽  
The One ◽  
T7 Exonuclease

The one-step biorecognition at a vertically aligned SWCNT-based biosensor and T7 exonuclease-assisted target recycling enable the ultrasensitive bioassay of microRNA-21.

Flame Synthesis of Carbon Nanotubes and Nano-Onions in a Rotating Opposed-Jets Flow

2013 ◽  
Vol 284-287 ◽  
pp. 310-314 ◽  
Author(s):  
Shuhn Shyurng Hou ◽  
Wei Cheng Huang
Keyword(s):  
Carbon Nanotubes ◽  
Strain Rate ◽  
Residence Time ◽  
Carbon Nanostructures ◽  
Diffusion Flames ◽  
Carbon Sources ◽  
Ni Substrate ◽  
Nano Structures ◽  
Lower Strain ◽  
Synthesis Of Carbon Nanotubes

The influence of flow rotation on the synthesis of carbon nano-structures using rotating opposed flow ethylene diffusion flames and a catalytic Ni substrate was investigated. In the experiments, the flame parameter was kept constant with fuel and oxidizer compositions of 20%C2H2+80%N2 and 40%O2+60%N2 in the upper and lower burners, respectively, whereas the strain rate was varied by adjusting the rotation speed. Stain rate affects carbon nano-structures synthesis either through the residence time of the flow or carbon sources available for the growth of carbon nanotubes (CNTs) and onions. A diffusion flame at low strain rate is stronger than a weak flame at high strain rate and produces more carbon sources because of the longer residence time of the flow. At a higher strain rate, curved and entangled tubular multi-walled CNTs were harvested, however, at a lower strain rate carbon nano-onions (CNOs) were synthesized. It is verified that flow rotation associated with residence time plays an important role in the synthesis of carbon nanostructures.

FLOATING CATALYST CVD SYNTHESIS OF CARBON NANOTUBES USING IRON (III) CHLORIDE: INFLUENCES OF THE GROWTH PARAMETERS

NANO ◽  
2009 ◽  
Vol 04 (06) ◽  
pp. 359-366 ◽  
Author(s):  
MEHRNOUSH KHAVARIAN ◽  
SIANG-PIAO CHAI ◽  
SOON HUAT TAN ◽  
ABDUL RAHMAN MOHAMED
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Reaction Temperature ◽  
Growth Parameters ◽  
Low Cost ◽  
Chemical Vapor ◽  
Flow Ratio ◽  
Transmission Electron ◽  
High Efficient ◽  
Synthesis Of Carbon Nanotubes

Carbon nanotubes (CNTs) were synthesized by a low-cost floating catalyst (FC) chemical vapor deposition (CVD) method in a horizontal reactor. It was found that iron (III) chloride ( FeCl3 ) is a high efficient FC precursor for methane CVD to grow CNTs. In this study, the effects of reaction temperature and flow ratio of methane to nitrogen ( CH4:N2 ) on the morphology of the CNTs were investigated. The morphological analysis by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed that increasing the reaction temperature and flow ratio of CH4:N2 grew CNTs of larger diameters. Energy dispersive X-ray (EDX) and thermogravimetric analysis (TGA) were employed to study the purity of the produced CNTs. As shown by the TGA, the highest yield of 74.19% was recorded for the CNTs grown at 1000°C and flow ratio CH4:N2 of 300:200.

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