Effects of H2O Addition on One-Step Liquid-Phase Synthesis of Highly Aligned Carbon Nanotubes

2010 ◽  
Vol 445 ◽  
pp. 201-204 ◽  
Author(s):  
Shunsuke Yamashita ◽  
Tomoka Kikitsu ◽  
Yoshihiro Yamaguchi ◽  
Kiyofumi Yamagiwa ◽  
Jun Kuwano
Keyword(s):  
Growth Rate ◽  
Liquid Phase ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Nanotube Arrays ◽  
Phase Synthesis ◽  
Carbon Nanotube Arrays ◽  
Aligned Carbon Nanotubes ◽  
One Step ◽  
The One

Highly aligned carbon nanotube arrays (HACNTAs) were synthesized on a stainless steel substrate from a methanol solution of Co(Ⅲ) acetylacetonate by the one-step liquid-phase synthesis, and effects of H2O addition on the HACNTA growth were examined. The growth rate was considerably accelerated, and the lifetime of the catalysts was prolonged by addition of a small amount of H2O. HACNTAs with over 400 m thickness were formed on the side surfaces of the substrate by resistance-heating for one hour. This suggests that the added H2O removes deposited amorphous carbons from the catalyst surfaces and consequently accelerates the growth rate.

Preparation and Characterization of Titania Porous-Nanotube Arrays with a High Growth Rate on Flexible Stainless Steel Substrate

2011 ◽  
Vol 399-401 ◽  
pp. 760-765 ◽  
Author(s):  
Xue Ting He ◽  
Jie Tao ◽  
Hai Jun Tao ◽  
Zuo Guo Bao
Keyword(s):  
Growth Rate ◽  
Stainless Steel ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
High Growth ◽  
High Growth Rate ◽  
Nanotube Arrays ◽  
X Ray Diffraction ◽  
Sendzimir Mill

Ti film sputtered on flexible stainless steel substrate that rolled by 20-high Sendzimir Mill, was anodized in ethylene glycol bath in the presence of 0.5 wt.% NH4F and 3 vol.% H2O at a high voltage of 60 V. High-aspect-ratio porous-nanotube arrays (PNTAs) of TiO2 with the tubes length of 6.2 µm were quickly prepared from Ti film, at the high growth rate of 20.7 nm·s-1. Then the morphology and structure of PNTAs were characterized by field emission scanning electron microscope (FESEM) and X-ray diffraction (XRD), respectively. Finally, a DSSC with the photoanode of PNTAs exhibited a performance of Jsc= 2.40 mA·cm-2, Voc= 0.79V, FF = 0.57 and η = 1.08%.

Synthesis of Highly Aligned Carbon Nanotubes in Liquid Phase

2007 ◽  
Vol 350 ◽  
pp. 23-26 ◽  
Author(s):  
Masafumi Mikami ◽  
Kiyofumi Yamagiwa ◽  
Tsuneharu Takeuchi ◽  
Morihiro Saito ◽  
Jun Kuwano
Keyword(s):  
Carbon Nanotubes ◽  
Stainless Steel ◽  
Liquid Phase ◽  
Dip Coating ◽  
Methanol Solution ◽  
Nanotube Arrays ◽  
Resistance Heating ◽  
Heating Method ◽  
Carbon Nanotube Arrays ◽  
Aligned Carbon Nanotubes

Aligned carbon nanotube arrays (CNTAs) were readily synthesized by a resistance heating method on a substrate of commercially available stainless steel which has more plentiful availability than the wafers of Si and quarts. The catalyst was supported on the substrate by dip coating with a methanol solution of M(C5H5)2(M=Co,Fe), and the substrate was electrically heated at 800oC in methanol. Highly aligned CNTAs were grown from the catalyst prepared from 0.02 M Co(C5H5)2 methanol solution. The alignment was influenced by the concentration and the kind of M(C5H5)2.

scholarly journals Catalyst-free growth of carbon nanotube arrays directly on Inconel® substrates for electrochemical carbon-based electrodes

2015 ◽  
Vol 3 (34) ◽  
pp. 17804-17810 ◽  
Author(s):  
Ricardo Manuel Silva ◽  
Alexandre Cunha Bastos ◽  
Filipe Jose Oliveira ◽  
Donato Ercole Conte ◽  
Yafei Fan ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Current Collector ◽  
Metallic Substrate ◽  
Nanotube Arrays ◽  
Active Electrode ◽  
Vertically Aligned Carbon Nanotubes ◽  
Carbon Nanotube Arrays ◽  
Aligned Carbon Nanotubes ◽  
Vertically Aligned ◽  
Free Growth

Vertically aligned carbon nanotubes grown directly onto a metallic substrate without external catalyst can be used as the active electrode material and the current collector, respectively.

Enhanced stability of Pd/SPS catalyst over the one-pot liquid-phase synthesis of methyl isobutyl ketone by adding GO

2019 ◽  
Vol 478 ◽  
pp. 110609 ◽  
Author(s):  
Yifan Zhu ◽  
Baining Lin ◽  
Yingjie Hu ◽  
Zhihui Cai ◽  
Huasheng Xie ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Methyl Isobutyl Ketone ◽  
Methyl Isobutyl ◽  
Isobutyl Ketone ◽  
One Pot ◽  
Phase Synthesis ◽  
The One ◽  
Enhanced Stability

An enhanced rate of the high-Tc phase formation in the Bi–Ca–Sr–Cu–O superconductor by the two-step reaction and rapid heating

1991 ◽  
Vol 6 (5) ◽  
pp. 916-927 ◽  
Author(s):  
Hyun M. Jang ◽  
Jong H. Moon ◽  
Hyun J. Shin
Keyword(s):  
Liquid Phase ◽  
Phase Formation ◽  
Rapid Heating ◽  
Reaction Scheme ◽  
Synthetic Approach ◽  
Activation Free Energy ◽  
High Tc Phase ◽  
One Step ◽  
Rich Liquid ◽  
The One

An alternative synthetic approach was attempted for the fabrication of the Bi–Ca–Sr–Cu oxide superconductor. In this approach a mixed Sr–Ca–Cu oxide powder was first formed, and the resulting powder was subsequently reacted with Bi2O3. With this reaction scheme, problems associated with the low reactivity of CuO and SrCO3 can be partially removed by converting the mixed oxide/carbonate precursors to the reactive Sr–Ca–Cu compound. An enhanced rate of formation of the high-Tc (110 K) phase was observed in the two-step reaction, and this was explained in terms of the low activation free energy path for the formation of the high-Tc phase, which increased the decomposition rate of the remnant CuO. Under the condition of rapid heating, the formation of the high-Tc phase in the one-step reaction was expedited by the Cu-rich liquid phase. However, the liquid phase caused the formation of an insulating layer between the superconducting grains in spite of its catalytic activity in the high-Tc phase formation.

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