Papers by Author: Fei Li

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Authors: Mao Fa Wang, Xiao Ping Zou, Fei Li, Jin Cheng, Hong Dan Zhang, Peng Fei Ren, Guang Zhu
805
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.
1137
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.
727
Authors: Guang Zhu, Xiao Ping Zou, Jin Cheng, Fei Li, Hong Dan Zhang, Peng Fei Ren, Mao Fa Wang
Abstract: The catalytic combustion technique was used to synthesize carbon nanotubes and carbon nanofibers. In this paper, we report that carbon nanofibers were synthesized by ethanol catalytic combustion technique. The as-grown products were characterized by means of scanning electron microscopy, transmission electron microscopy, Raman spectroscopy. The results showed that the products have a mass of carbon nanofibers. However, morphology and microstructure of carbon nanofibers are affected by synthesis conditions, such as stability of flames and sampling time, sampling temperature etc. Different Influence factors were depicted in detail. Ethanol catalytic combustion technique offer a simple method to synthesize carbon nanotubes and carbon nanofibers, it also has some advantages, such as flexible synthesis conditions, simple setup, and environment-friendly.
1537
Authors: Jin Cheng, Xiao Ping Zou, Fei Li, Hong Dan Zhang, Peng Fei Ren
Abstract: It is very important to study the effects of various factors on synthesis of carbon nanomaterials for controlled synthesis, which plays a significant role in realizing desired nanostructures or nanodevices for applications. In this report, we employed iron nitrate solution with different concentration, such as 1 mol/l, 0.1 mol/l, 0.01 mol/l, and saturated iron nitrate solution as catalyst precursor solution and studied the effects of concentration of catalyst precursor solution on carbon nanostructures that were synthesized by ethanol catalytic combustion (ECC) process. We have characterized the as-grown carbon nanostructures by employing scanning electron microscopy (SEM) and transmission electron microscopy (TEM) for deep understanding.
1245
Authors: Fei Li, Xiao Ping Zou, Jin Cheng, Hong Dan Zhang, Peng Fei Ren, Guang Zhu, Mao Fa Wang
Abstract: Catalytic grown carbon nanofibers have been obtained from decomposition of ethanol over copper plate. Ferric chloride of different concentration was employed as the catalyst precursor. Scanning electron microscopy has shown that different morphologies of carbon nanofibers can be obtained by using different concentration of catalyst precursor solution. The results from the Raman spectroscopic characterization have also demonstrated that the graphitization of carbon nanofibers can be tailored by control of the concentration of catalyst precursor solution. When the information from these characterization are combined with that of the associated morphologies of the carbon nanofibers, it is possible to synthesize perfect carbon nanofibers.
809
Authors: Fei Li, Xiao Ping Zou, Jin Cheng, Hong Dan Zhang, Peng Fei Ren, Guang Zhu, Mao Fa Wang
Abstract: Carbon nanofibers have been obtained by the interaction of ethanol with metal chloride over copper plate. Different metal chloride was used as the catalyst precursor. The products were characterized by the Raman spectroscopy for the degree of graphitization. The relative intensities and the amount of amorphous carbon were estimated. The results indicate that the catalyst precursor has effects on the degree of graphitization of carbon nanofibers.
1387
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.
731
Authors: Fei Li, Xiao Ping Zou, Jin Cheng, Hong Dan Zhang, Peng Fei Ren, Guang Zhu, Mao Fa Wang
Abstract: A simple method was reported for synthesis of carbon nanofibers. Ethanol burner was employed as the setup. Different morphological carbon nanofibers were synthesized by the decomposition of ethanol. As-grown carbon nanofibers were characterized. The results indicate that depending on the size of catalyst, carbon deposits with different morphologies were produced.
1383
Authors: Fei Li, Xiao Ping Zou, Jin Cheng
Abstract: The multi-directional grown carbon nanofibers have been synthesized by catalytic combustion technique. Transmission electron microscopy and selected area electron X-ray diffraction were combined to characterize the carbon products and their catalyst, which promoted the formation of carbon nanofibers. The crystal structures of the catalyst were investigated. The present results indicate that the morphologies of the carbon nanofibers have a close relation with the crystal structure of the catalysts.
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