Wang Huafeng, Li Zhenhua, Inoue Sakae, Ando Yoshinori
21st COE Program "Nano Factory," Department of Materials Science and Engineering, Meijo University, Nagoya 468-8502, Japan.
J Nanosci Nanotechnol. 2010 Jun;10(6):3988-93. doi: 10.1166/jnn.2010.1971.
In this study, we investigated the role of Mo on the growth of single-walled carbon nanotubes (SWNTs) in arc discharge method. Mo with various concentrations was incorporated into two typical arc systems, namely Ni/Y-He and Fe-Ar/H2. Based on analyses of yield and purity, we found the best concentration of Mo is 0.5 at% in Ni/Y-He system and 0.3 at% in Fe-Ar/H2 system. For both systems, the incorporation of Mo has dramatically increased the yield of soot in their best concentrations. On the contrary, the promotion effects of Mo on purity of SWNTs were not same. Thermal gravimetric analysis showed that with the addition of Mo, the purity of SWNTs did not change effectively for Ni-Y/Mo-He system, but noticeable increment of purity was observed for Fe/Mo-Ar/H2 system from 33 wt% to 50 wt%. Considering on these experimental results, we prove that Mo plays a positive role in arc discharge for the enhancement of SWNTs growth.
在本研究中，我们研究了钼在电弧放电法中单壁碳纳米管（SWNTs）生长过程中的作用。将不同浓度的钼引入到两个典型的电弧系统中，即Ni/Y-He和Fe-Ar/H2。基于产率和纯度分析，我们发现钼在Ni/Y-He系统中的最佳浓度为0.5原子百分比，在Fe-Ar/H2系统中的最佳浓度为0.3原子百分比。对于这两个系统，在各自最佳浓度下引入钼都显著提高了烟灰的产率。相反，钼对SWNTs纯度的促进作用并不相同。热重分析表明，添加钼后，Ni-Y/Mo-He系统中SWNTs的纯度没有有效变化，但Fe/Mo-Ar/H2系统中SWNTs的纯度从33 wt%显著提高到了50 wt%。基于这些实验结果，我们证明钼在电弧放电中对增强SWNTs生长起到了积极作用。
