To achieve the reinforcement of copper matrix composite by single-walled carbon nanotubes, a three-step-refluxing purification of carbon nanotubes sample with HNO3-NaOH-HCl was proposed and demonstrated. A previously reported purification process using an electromagnetic stirring with H2O2/HCl mixture was also repeated. Then, the purified carbon nanotubes were coated with copper by the same electroless plating process. At the end, the effects of the method on carbon nanotubes themselves and on copper coating were determined by transmission electron microscope spectroscopy, scanning electron microscope spectroscopy, X-ray diffractometry, thermogravimetric analysis, Fourier transformed infrared spectroscopy, and energy dispersive spectrometry. It was clearly confirmed that both of the two processes could remove most of iron catalyst particles and carbonaceous impurities without significant damage to carbon nanotubes. The thermal stability of the sample purified by H2O2/HCl treatment was slightly higher than that purified by HNO3-NaOH-HCl treatment. Nevertheless, the purification by HNO3-NaOH-HCl treatment was more effective for carboxyl functionalization on nanotubes than that by H2O2/HCl treatment. The Cu-coating on carbon nanotubes purified by both purification processes was complete, homogenous, and continuous. However, the Cu-coating on carbon nanotubes purified by H2O2/HCl was oxidized more seriously than those on carbon nanotubes purified by HNO3-NaOH-HCl treatment.
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机译:为了通过单壁碳纳米管加固铜基质复合材料,提出并证明了用HNO3-NaOH-HCl碳纳米管样品的三步回流净化碳纳米管样品。还重复使用使用电磁搅拌的电磁搅拌的预先报道的净化过程。然后,通过相同的化学镀过程将纯化的碳纳米管用铜涂覆。最后,通过透射电子显微镜光谱法测定该方法对碳纳米管本身和铜涂层的影响,扫描电子显微镜光谱,X射线衍射测定,热重分析,傅里叶变换的红外光谱,以及能量分散光谱法测定。清楚地证实,两种方法都可以去除大部分铁催化剂颗粒和碳质杂质,而不会对碳纳米管造成显着损害。通过H 2 O 2 / HCl处理纯化的样品的热稳定性略高于通过HNO3-NaOH-HCl处理纯化的样品。然而,通过HNO3-NaOH-HCl处理的纯化对于纳米管上的羧基官能化比通过H 2 O 2 / HCl处理更有效。通过净化方法纯化的碳纳米管上的Cu-涂层是完全的,均匀的和连续的。然而,通过H 2 O 2 / HCl纯化的碳纳米管上的Cu-涂层比通过HNO3-NaOH-HCl处理纯化的碳纳米管的Cu-涂层氧化。
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