Synthesis of carbon nanotubes by microwave heating: Influence of diameter of catalytic Ni nanoparticles on diameter of CNTs
Synthesis of carbon nanotubes by microwave heating: Influence of diameter of catalytic Ni nanoparticles on diameter of CNTs
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DOI：
10.1039/c3ta13297h
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发表时间：
2014-01
影响因子：
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通讯作者：
K. Ohta;T. Nishizawa;T. Nishiguchi;Ryo Shimizu;Y. Hattori;I. Shuji;Katayama Masakazu;K. Mizuuchi;T. Kono
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文献类型：
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作者：
K. Ohta;T. Nishizawa;T. Nishiguchi;Ryo Shimizu;Y. Hattori;I. Shuji;Katayama Masakazu;K. Mizuuchi;T. Kono
以聚苯乙烯颗粒为原料，通过煅烧不同粒径的镍纳米粒子，快速合成了多壁碳纳米管（DNi = 10、20、50或90 nm）在氮气下在一定温度和时间下（700 °C，15分钟或800 °C，10分钟），利用家用微波炉，系统地研究了镍纳米颗粒的直径对MWCNTs直径的影响。用透射电子显微镜、拉曼光谱仪和广角X射线衍射仪对合成的多壁碳纳米管进行了表征。我们发现，对于煅烧条件，（800 °C，10 min），所得碳纳米管的外径（DCNT）与催化镍纳米颗粒的直径（DNi）之间可以描述为线性函数，DCNT = 1.01DNi + 14.79 nm，相关系数R = 0.99，并且对于700 °C的煅烧条件，15分钟，DCNT = 1.12DNi + 7.80 nm，R = 0.95。因此，我们发现，当催化镍纳米颗粒（DNi）的直径增加1 nm时，所获得的MWCNT（DCNT）的外径增加约1 nm。
We rapidly synthesized multi walled carbon nanotubes (MWCNTs) by calcination of granulated polystyrene with nickel nanoparticles having different average diameter (DNi = 10, 20, 50 or 90 nm) under nitrogen gas at a certain temperature and time (700 °C, 15 min or 800 °C, 10 min), using a domestic microwave oven in order to systematically investigate the influence of the diameter of nickel nanoparticles on the diameter of MWCNTs. The MWCNTs synthesized here were characterized by a transmission electron microscope, a Raman spectrophotometer and a wide angle X-ray diffractometer. We found that for the calcination condition of (800 °C, 10 min), a relationship between the outer diameter of the resulted carbon nanotubes (DCNT) and the diameter of catalytic nickel nanoparticles (DNi) can be described as a linear function, DCNT = 1.01DNi + 14.79 nm with the correlation coefficient R = 0.99, and that for the calcination condition of 700 °C, 15 min, DCNT = 1.12DNi + 7.80 nm with R = 0.95. Thus, we revealed that when the diameter of the catalytic nickel nanoparticles (DNi) increases by 1 nm, the outer diameter of the obtained MWCNTs (DCNT) increases by about 1 nm.