Temperature dependent separation of metallic and semiconducting carbon nanotubes using gel agarose chromatography
Temperature dependent separation of metallic and semiconducting carbon nanotubes using gel agarose chromatography
复制标题
DOI：
10.1016/j.carbon.2015.05.036
复制
发表时间：
2015-11
期刊：
影响因子：
10.9
通讯作者：
I. Yahya;F. Bonaccorso;F. Bonaccorso;S. Clowes;A. Ferrari;S. Silva
中科院分区：
文献类型：
--
作者：
I. Yahya;F. Bonaccorso;F. Bonaccorso;S. Clowes;A. Ferrari;S. Silva
金属(m-SWNTs)和半导体(S-SWNTs)单壁碳纳米管(SWNTs)的合成后分离仍然是一个具有挑战性的过程。凝胶-琼脂糖层析法是一种高效、大规模的分离技术。然而，尚未实现完全(100%)分离，主要原因是对基本机制缺乏了解。在这里，我们研究了温度对凝胶琼脂糖色谱分离四种不同来源的单壁碳纳米管的影响。利用凝胶琼脂糖微珠过滤技术，我们获得了高达70%的m-单壁碳纳米管和90%以上的S单壁碳纳米管，与原料无关。该过程与温度有关，在6℃时，S碳纳米管(HIPCO)的产率高达95%。温度影响十二烷基硫酸钠表面活性剂胶束沿碳纳米管侧壁的分布，从而决定了按电子类型对碳纳米管进行分选的有效性。然后，经过分类的单壁碳纳米管被用来制造具有非常低的截止电流(∼10−13A)、高通断电流比(>；106)和电荷载流子迁移率∼=40 cm2V−1s−1的晶体管。
Post-synthesis separation of metallic (m-SWNTs) and semiconducting (s-SWNTs) single-wall carbon nanotubes (SWNTs) remains a challenging process. Gel agarose chromatography is emerging as an efficient and large scale separation technique. However, the full (100%) separation has not been achieved yet, mainly due to the lack of understanding of the underlying mechanism. Here, we study the temperature effect on the SWNTs separation via gel agarose chromatography, for four different SWNT sources. Exploiting a gel agarose micro-beads filtration technique we achieve up to 70% m-SWNTs and over 90% s-SWNTs, independent of the source material. The process is temperature dependent, with yields up to 95% for s-SWNT (HiPco) at 6 °C. Temperature affects the sodium dodecyl sulfate surfactant-micelle distribution along the SWNT sidewalls, thus determining the effectiveness of the SWNTs sorting by electronic type. The sorted SWNTs are then used to fabricate transistors with very low OFF-currents (∼10−13A), high ON/OFF current ratio (>106) and charge carriers mobility ∼ 40 cm2V−1s−1.