Moderating carbon supply and suppressing Ostwald ripening of catalyst particles to produce 4.5-mm-tall single-walled carbon nanotube forests
Moderating carbon supply and suppressing Ostwald ripening of catalyst particles to produce 4.5-mm-tall single-walled carbon nanotube forests
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DOI：
10.1016/j.carbon.2011.06.061
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发表时间：
2011-11-01
期刊：
影响因子：
10.9
通讯作者：
Noda, Suguru
中科院分区：
文献类型：
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作者：
Hasegawa, Kei;Noda, Suguru
以Fe/Al-Si-O为催化剂，C2 H2/H2O/Ar为反应体系，采用化学气相沉积（CVD）法制备了毫米级单壁碳纳米管森林。使用组合催化剂库，再加上单壁碳纳米管生长的实时监测，催化剂和CVD条件进行了系统的研究。这种生长的关键是保持C2 H2压力低于其上限，以防止催化剂的死亡，并在催化剂颗粒由于奥斯特瓦尔德熟化而变粗而失去活性之前生长SWCNT。较低的温度导致C2 H2压力的下限，这导致较低的生长速率，但也导致甚至更低的粗化速率，这导致甚至更长的生长寿命。利用这些原理，我们在750摄氏度下在2.5小时内生长出4.5毫米高的SWCNT森林。(C)2011爱思唯尔有限公司保留所有权利。
Millimeter-tall single-walled carbon nanotube (SWCNT) forests were grown by chemical vapor deposition (CVD) from C2H2/H2O/Ar using Fe/Al-Si-O catalysts. Using combinatorial catalyst libraries coupled with real-time monitoring of SWCNT growth, the catalyst and CVD conditions were systematically studied. The keys for this growth are to maintain the C2H2 pressure below its upper limit to prevent the killing of the catalysts and to grow the SWCNTs before the catalyst particles lose their activity because of coarsening through Ostwald ripening. Lower temperatures lead to lower limits for the C2H2 pressure which result in lower growth rates but also lead to even lower coarsening rates which result in even longer growth lifetimes. Using these principles, we grew 4.5-mm-tall SWCNT forests in 2.5 h at 750 degrees C. (C) 2011 Elsevier Ltd. All rights reserved.