High Purity and Yield Separation of Semiconducting Single-Walled Carbon Nanotubes Dispersed in Aqueous Solutions with Density Gradient Ultracentrifugation Using Mixed Dispersants of Polysaccharides and Surfactants
High Purity and Yield Separation of Semiconducting Single-Walled Carbon Nanotubes Dispersed in Aqueous Solutions with Density Gradient Ultracentrifugation Using Mixed Dispersants of Polysaccharides and Surfactants
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DOI：
10.7567/jjap.52.035102
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发表时间：
2013-02
影响因子：
1.5
通讯作者：
K. Tsuchiya;K. Uchida;Yoshiya Kaminosono;Kazushi Shimizu;T. Ishii;H. Yajima
中科院分区：
文献类型：
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作者：
K. Tsuchiya;K. Uchida;Yoshiya Kaminosono;Kazushi Shimizu;T. Ishii;H. Yajima
合成的单壁碳纳米管(SWNTs)的异质性阻碍了其在高分辨率场效应管、纳米传感器和导电薄膜方面的潜在应用。在本研究中，我们提出了一种新的选择性分离方法，利用密度梯度超速离心法从由羧甲基纤维素钠和十二烷基硫酸钠组成的混合分散剂分散的单壁半导体碳纳米管(S-SWNTs)中收集高纯度的SWNTs。紫外-可见-近红外(UV-Vis-NIR)吸收光谱、共振拉曼光谱和近红外光致发光光谱表明，经DGU处理后，S碳纳米管的纯度达到97%以上，回收率约为40%。这一分离战略预计将影响使用S-单壁碳纳米管的应用领域。
The heterogeneity of as-synthesized single-walled carbon nanotubes (SWNTs) prevents their potential applications in high-resolution field-effect transistors, nanoscale sensors, and conductive films. In the present study, we demonstrate the development of a new selective-separation procedure for collecting semiconducting single-walled carbon nanotubes (s-SWNTs) with a high purity from as-synthesized SWNTs individually dispersed with mixed dispersing agents consisting of carboxymethylcellulose (CMC) and sodium dodecyl sulfate (SDS) in water using density gradient ultracentrifugation (DGU). Ultraviolet–visible–near infrared (UV–vis–NIR) absorption, resonance Raman, and NIR photoluminescence spectroscopies revealed that the s-SWNTs were enriched to a purity of more than 97%, and that the recovery was approximately 40% through the DGU treatment. This separation strategy is expected to impact the application fields using s-SWNTs.