Multiple “optimum” conditions for Co–Mo catalyzed growth of vertically aligned single-walled carbon nanotube forests
Multiple “optimum” conditions for Co–Mo catalyzed growth of vertically aligned single-walled carbon nanotube forests
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DOI：
10.1016/j.carbon.2008.10.001
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发表时间：
2009
期刊：
影响因子：
10.9
通讯作者：
Hisashi Sugime;S. Noda;S. Maruyama;Y. Yamaguchi
中科院分区：
文献类型：
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作者：
Hisashi Sugime;S. Noda;S. Maruyama;Y. Yamaguchi
以Co-Mo二元催化剂为催化剂，采用乙醇催化化学气相沉积的方法在衬底上直接生长碳纳米管。利用组合催化剂库研究了最佳催化条件和反应条件。通过绘制碳纳米管的产率与Co和Mo的垂直梯度厚度剖面图，确定了衬底上的高催化活性区域。随着反应温度、乙醇压力和乙醇流量的变化，这些区域的位置发生了变化。垂直排列的单壁碳纳米管森林在10分钟内在几个地区生长到最大高度约30μm。在纯Co催化剂上得到了垂直排列的单壁碳纳米管森林，其直径呈双峰分布。讨论了Mo对催化剂纳米颗粒的形成和SWCNT直径分布的影响，发现单层或更薄的Mo抑制了SWCNT直径分布的展宽。
Carbon nanotubes (CNTs) were grown directly on substrates by alcohol catalytic chemical vapor deposition using a Co–Mo binary catalyst. Optimum catalytic and reaction conditions were investigated using a combinatorial catalyst library. High catalytic activity areas on the substrate were identified by mapping the CNT yield against the orthogonal gradient thickness profiles of Co and Mo. The location of these areas shifted with changes in reaction temperature, ethanol pressure and ethanol flow rate. Vertically aligned single-walled CNT (SWCNT) forests grew in several areas to a maximum height of ca. 30μm in 10min. A pure Co catalyst yielded a vertically aligned SWCNT forest with a bimodal diameter distribution. The effects of Mo on the formation of catalyst nanoparticles and on the diameter distribution of SWCNTs are discussed and Mo as thin as a monolayer or thinner was found to suppress the broadening of SWCNT diameter distributions.