Papers by Keyword: Ethanol Catalytic Combustion Technique

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Authors: Hong Dan Zhang, Xiao Ping Zou, Jin Cheng, Fei Li, Peng Fei Ren
Abstract: Carbon nanotubes and carbon nanowires were synthesized by ethanol catalytic combustion (ECC) technique, using FeCl3 solution as a catalyst precursor. Applying the 0.01 mol/l, 0.1 mol/l and 1 mol/l FeCl3 as catalyst precursor solution to the copper plate, carbon nanotubes and carbon nanowires were synthesized. The effect of concentration on growth and structural changes of the as-grown nanomaterials are illustrated and discussed. This technique has advantages of low cost, large scale production and flexible reaction conditions, etc. This technique can be used to synthesize carbon nanotubes and nanowires on metal substrate directly. This technique also has potential applications for fabricating nano-electrical devices.
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Authors: Hong Dan Zhang, Xiao Ping Zou, Jin Cheng, Fei Li, Peng Fei Ren, Mao Fa Wang, Guang Zhu
Abstract: In this paper we report the preparation of carbon nanotubes (CNTs) by ethanol catalytic combustion (ECC) technique. We employed cobalt salt as catalyst precursors, copper plate as substrate and ethanol as carbon source. In order to have a better understanding of the growth mechanisms, we employed cobalt chloride, cobalt nitrite and cobalt sulfate as catalyst precursor to study the influence of catalysts on CNTs growth respectively. Entangled and nonseparated CNTs were aggregated together when the catalyst precursor was cobalt chloride, while straight and uniform CNTs were obtained when the catalyst precursor was cobalt sulfate. In the case of using cobalt nitrite as catalyst precursor, the CNTs tend to form helical and disordered structure. We have examined the morphology and microstructure of the obtained CNTs and discussed the growth mechanism.
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Authors: Guang Zhu, Xiao Ping Zou, Jin Cheng
Abstract: A simple catalytic combustion technique for synthesizing bamboo-like carbon was presented. Ethanol was used as carbon source and fuel, copper plate as substrate, and iron salt as catalyst precursors. The as-grown black powder was characterized by means of scanning electron microscopy, and transmission electron microscopy. The results show that the morphology and microstructure of bamboo-like carbon nanotubes are affected by novel synthesis conditions, such as concentration of catalyst precursor solution, synthesis time, flame perturbations, and synthesis temperature etc.. According to observations and analysis of experimental results, a possible growth mechanism of bamboo-like carbon nanotubes is proposed and discussed.
355
Authors: Peng Fei Ren, Xiao Ping Zou, Jin Cheng, Hong Dan Zhang, Fei Li, Guang Zhu, Mao Fa Wang
Abstract: In this paper, we report a simple growth of carbon nanofibers by means of the combustion of ethyl alcohol. In our experiment, copper plate was employed as substrate, iron nitrate and iron chloride as catalyst precursor and ethanol as carbon source. The as-grown carbon nanofibers were characterized by employing scanning electron microscopy, transmission electron microscopy, high-resolution field-emission transmission electron microscopy and Reinshaw optical confocal Raman spectroscopy. Our results suggested that it would tend to form relatively uniform nanofibers when the catalyst precursor was iron nitrate, however, to form some helical structure nanofibers when the catalyst precursor was iron chloride. The sample using iron chloride as the catalyst precursor has a higher graphitization degree than that using iron nitrate as the catalyst precursor.
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