Influence of acid treatments of carbon nanotube precursors on Ni/CNT in the synthesis of carbon nanotubes |
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Authors: | Huaping Liu Guoan Cheng Ruiting Zheng Yong Zhao Changlin Liang |
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Institution: | Key Laboratory of Radiation Beam Technology and Material Modification of Education Ministry, Department of Materials Science and Engineering, Beijing Normal University, Beijing 100875, PR China |
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Abstract: | The Ni/CNT catalyst was fabricated by directly dipping carbon nanotube precursors refluxed in 4 M of nitric acid into Ni electroless plating bath, and used to synthesize new carbon nanotubes. The experimental results indicate that the duration of acid-treatment of carbon nanotubes precursors exerts a great influence on the catalysis of Ni/CNT in the synthesis of carbon nanotubes and hence the structures of the new carbon nanotubes. When the carbon nanotubes precursors were refluxed for 0.5 h in 4 M of nitric acid, bamboo-shaped carbon nanotubes (BSCNT) or Y junction carbon nanotubes in the carbon products were obtained. As the duration of acid-treatment of carbon nanotubes precursors increased to 6 h, the as-prepared Ni/CNT displayed higher activity, and the carbon nanotube products were high pure without any Y junction structure or any separation layers in hollow. |
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Keywords: | Carbon nanotubes Ni/CNT Bamboo-shaped structure Y junction |
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