Papers by Author: Cui Liu Wei

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Authors: Jin Cheng, Xiao Ping Zou, Gang Qiang Yang, Xue Ming Lü, Cui Liu Wei, Zhe Sun, Hong Ying Feng, Yuan Yang
Abstract: A set of Y-shaped carbon nanofibers obtained from ethanol flames is reported. The set of Y-shaped carbon nanofibers includes four types of morphologies. No catalyst particles could be found at the junction of Y-shaped carbon nanofibers. The growth mechanism of the multiple Y-junction carbon nanofibers is discussed.
623
Authors: Cui Liu Wei, Xiao Ping Zou, Jin Cheng, Zhao Xian Yu, Gang Qiang Yang, Xue Ming Lü, Zhe Sun, Hong Ying Feng, Yuan Yang
Abstract: Combustion method is a simple method to synthesize carbon nanotubes(CNTs), which employs flames of carbon-contained reactant to synthesize CNTs. It has been proved that combustion method is an effective method to synthesize carbon nanotubes and carbon nanofibers. In this paper, we reported the synthesis of CNTs by using ethanol catalytic combustion with an additive of thiophene, which employed ethanol as carbon source and fuel, nitrate as catalyst precursor, stainless steel as substrate, and thiophene as accelerant. Compared with previous reports on the synthesis of CNTs by ethanol catalytic combustion, great yield of CNTs were obtained with adding thiophene in ethanol. The reproducibility of the synthesis of CNTs in the case of adding thiophene in ethanol was greatly improved.
627
Authors: Zhe Sun, Xiao Ping Zou, Jin Cheng, Xiang Min Meng, Cui Liu Wei, Gang Qiang Yang, Xue Ming Lü, Hong Ying Feng, Yuan Yang
Abstract: In this paper, we report a simple method to fabricate lead oxide nanostructure by electrochemical deposition. In our experiment, the electrolyte was lead nitrate aqueous solution containing some drops of concentrated hydrochloric acid. ITO was employed as both cathode and substrate. The controlled current that was supplied by a direct current power supply passed through the electrolyte to deposit the PbO nanostructure on the surface of ITO at room temperature. The morphology of lead oxide was affected by the concentration of electrolyte. So the impact of the electrolyte concentration on the synthesis of PbO nanostructure was discussed. The as-synthesized products were characterized by scanning electron microscopy and X-ray diffraction. Our results indicate that different PbO nanostructure could be formatted with different electrolyte concentration at current densities in the range of 5-10mA/cm2.
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Authors: Jin Cheng, Xiao Ping Zou, Xiang Min Meng, Gang Qiang Yang, Xue Ming Lü, Cui Liu Wei, Zhe Sun, Hong Ying Feng, Yuan Yang
Abstract: Synthesis of PbO nanorods on an ITO glass by electrochemical deposition was reported. Compared with previous report on the electrochemical deposition of PbO nanorods on stainless steel substrates, massive PbO nanorods were obtained with good reproducibility. The PbO nanorods have a length of several tens of micrometers and a diameter of about 100-200nm. The process for electrochemical deposition of PbO nanorods on ITO glass was investigated.
663
Authors: Jin Cheng, Xiao Ping Zou, Xiang Min Meng, Gang Qiang Yang, Xue Ming Lü, Cui Liu Wei, Zhe Sun, Hong Ying Feng, Yuan Yang
Abstract: The preparation of metallic lead films by electrochemical deposition was reported. Although primary deposits at fresh state (also referred to as fresh deposits) were indeed metallic lead films, the fresh lead films could be rapidly oxidized to lead oxide in air. To obtain long stable metallic lead films, the key process is how to prevent the oxidization of fresh lead films. Our studies indicate that the washing of fresh metallic lead films in absolute alcohol is a simple but effective method to protect the lead films from the oxidization for an extended period of more than 20 days.
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Authors: Jin Cheng, Xiao Ping Zou, Gang Qiang Yang, Xue Ming Lü, Cui Liu Wei, Zhe Sun, Hong Ying Feng, Yuan Yang
Abstract: Fractal carbon films deposited on copper plate by ethanol chemical vapor deposition are reported. In order to prepare fractal carbon films, iron nitrate was employed as catalyst precursor, copper plate as substrate, and ethanol as carbon source materials. The as-prepared carbon films were characterized by employing scanning electron microscopy and Raman spectroscopy. The thickness of the film was a few micrometers. According to Raman spectrum, we know the films exhibit low graphitization. According to SEM observation, we find that there are many protuberances with nanometer scale tips on the film surface. Due to direct growth on metal substrate and many nanometer scale tips, it has potential application that is fit for electron source in vacuum devices.
1239
Authors: Gang Qiang Yang, Xiao Ping Zou, Xiang Min Meng, Gong Qing Teng, Jin Cheng, Yi Su, Xue Ming Lü, Cui Liu Wei, Zhe Sun, Hong Ying Feng, Yuan Yang
Abstract: In this paper, zinc oxide nanorods were prepared on many different substrates in the aqueous solution without adding alkali solution at 60°C. A layer of ZnO particles as the seeds for the growth were not needed to be coated on the substrates beforehand. A higher uniform and denser packed array of hexagonal ZnO nanorods forms on the glass substrate than that on the other substrates in our experiments. This technique is applicable for the preparation and patterning of functional ZnO films at low temperature. The growth mechanisms of the as-synthesized ZnO nanorods were also proposed.
691
Authors: Xue Ming Lü, Xiao Ping Zou, Jin Cheng, Gang Qiang Yang, Cui Liu Wei, Zhe Sun, Hong Ying Feng, Yuan Yang, Gong Qing Teng, Xiang Min Meng
Abstract: KCl is usually used as the supporting electrolyte in electrochemical deposition of Zinc oxide materials. Besides the role of supporting electrolyte, it can also influence the morphology of the fabricated materials. In this work, ZnO and zinc hydroxide chloride hydrate (Zn5(OH)8Cl2•H2O) mixture with platelet-like morphology were electrochemically deposited directly on ITO-coated glass substrates at 65°C. The electrolyte was 0.1M Zn(NO3)2•6H2O with KCl concentration varied from 0 to 3.2M. It was found that only ZnO thin film was obtained when the concentration of KCl was below 0.02M. Plates structure appeared as the concentration of KCl increased to 0.04M. Plentiful plates were obtained when the concentration of KCl was 0.05M-0.2M. From the X-ray diffraction, it was confirmed that the plate films was the mixture of ZnO and Zn5(OH)8Cl2•H2O. The plates showed perfect single crystal structure confirmed by selected area electron diffraction. Zn and Zn5(OH)8Cl2•H2O were obtained when the concentration of KCl was above 0.8M.
703
Authors: Jin Cheng, Xiao Ping Zou, Gang Qiang Yang, Xue Ming Lü, Cui Liu Wei, Zhe Sun, Hong Ying Feng, Yuan Yang
Abstract: In this paper, we report the synthesis of Fe-filled carbon nanotube arrays by floating catalyst chemical vapor deposition, which employed ferrocene as both catalyst precursor for carbon nanotube growth and the iron source for iron filling. We obtained Fe-filled carbon nanotube arrays perpendicular to the surface of the quartz substrates by floating catalyst chemical vapor deposition. We also conducted controlled experiments at different temperatures. Our results indicated that a higher synthesis temperature is needed for synthesizing Fe-filled carbon nanotube arrays. Magnetic property measurements revealed that the Fe-filled carbon nanotubes exhibited a high average coercivity of about 589.97G.
711
Authors: Gang Qiang Yang, Xiao Ping Zou, Xiang Min Meng, Gong Qing Teng, Jin Cheng, Yi Su, Xue Ming Lü, Cui Liu Wei, Zhe Sun, Hong Ying Feng, Yuan Yang
Abstract: ZnO micro/nano rods were grown on fluorine doped tin oxide (FTO) substrates by aqueous chemical growth (ACG) using Zn(NO3)2•6H2O and C6H12N4 at low temperature. For comparison, the yield of nanorods on indium-tin-oxide (ITO) substrates with same parameters was also discussed. SEM, TEM, SAED and XRD were utilized to characterize morphologies and structures of ZnO crystals. It was indicated that the temperature and the concentration of the solution significantly leads to the yields of the ZnO. Single-crystalline ZnO micro/nano rods could be synthesized via an aqueous solution route without adding alkali solution at 70°C in large area.
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