Millimeter-Tall Single-Walled Carbon Nanotubes Rapidly Grown with and without Water
Millimeter-Tall Single-Walled Carbon Nanotubes Rapidly Grown with and without Water
复制标题
DOI：
10.1021/nn102380j
复制
发表时间：
2011-02-01
期刊：
影响因子：
17.1
通讯作者：
Noda, Suguru
中科院分区：
文献类型：
--
作者：
Hasegawa, Kei;Noda, Suguru
采用化学气相沉积法，在Al-Si-O衬底上负载Fe催化剂，以C2 H2/Ar为反应介质，添加或不添加水，在10-15 min内生长出毫米级垂直排列的单壁碳纳米管（SWCNTs）。使用组合催化剂库，再加上实时监测的单壁碳纳米管的生长，催化剂和化学气相沉积条件进行了系统的检查，并获得毫米高的单壁碳纳米管，即使没有水添加。单壁碳纳米管毫米级生长的关键是将C2 H2供应限制在一定分压以下，以保持活性催化剂。在过量C2 H2供应下，水会延长催化剂的寿命，而它会使小的催化剂颗粒失活，同时降低单壁碳纳米管的质量。我们还观察到由于催化剂颗粒的粗化，单壁碳纳米管的直径随着生长而逐渐增加，并且发现水对这种现象没有影响。我们展示了毫米高的单壁碳纳米管生长简单地使用C2 H2/Ar气体没有水添加，这揭示了水的神秘作用，我们显示了一个实用的路线，大规模生产单壁碳纳米管。
Millimeter-tall vertically aligned single-walled carbon nanotubes (SWCNTs) were grown in 10-15 min by chemical vapor deposition from C2H2/Ar with or without water addition using Fe catalyst supported on an Al-Si-O underlayer. Using combinatorial catalyst libraries coupled with the real-time monitoring of SWCNT growth, the catalyst and chemical vapor deposition conditions were systematically examined, and millimeter-tall SWCNTs were obtained even without water addition. The key for millimeter-scale growth of SWCNTs is to limit the C2H2 supply to below a certain partial pressure to retain an active catalyst. Water prolongs the catalyst lifetime under excess C2H2 supply, whereas it deactivates small catalyst particles and degrades the quality of SWCNTs at the same time. We also observed a gradual increase in the diameter of SWCNTs with growth because of the coarsening of catalyst particles and found that water had no effect on this phenomenon. We demonstrate millimeter-tall SWCNTs grown by simply using C2H2/Ar gas without water addition, which revealed the mysterious role of water, and we show a practical route for the large-scale production of SWCNTs.