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arXiv 0902.0010cond-mat.mtrl-sci
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近纯(10,5)单壁碳纳米管的光学特性及电子器件

Optical Characterizations and Electronic Devices of Nearly Pure (10,5) Single-Walled Carbon Nanotubes

Li Zhang, Xiaomin Tu, Kevin Welsher, Xinran Wang, Ming Zheng, Hongjie Dai

摘要:

实现仅由单手性单壁碳纳米管(SWNT)组成的高性能单壁碳纳米管场效应晶体管(FET)仍然是一个难以实现的目标。已经设计了许多分离机制,并证明了不同程度的分离,但仍然难以达到将给定的纳米管混合物完全分馏成其单一手性组分的目标。据报道,色谱法可以根据直径、手性和长度分离小的单壁碳纳米管(直径小于0.9nm)。使用ssDNA序列d(GT)n(n=10-45)时,分离效率随管径增加而降低。本文报道了用离子交换色谱法从HiPco管中分离单手性(10,5)单壁碳纳米管(直径= 1.03nm)的结果。通过使用新的DNA序列(TTTA)3 T提高了分离效率,所述新的DNA序列(TTTA)3 T可以识别具有特定手性的SWNT(10,5)。通过光学吸收、拉曼光谱、光致发光激发/发射和电输运测量研究了分离管的手性。所有光谱方法均得到(10,5)管的单峰。根据电测量,纯度为99%。由于单个手性富集的(10,5)管,由并联的分离的SWNT组成的FET给出高达106的Ion/Ioff比。这是首次实现具有单手性SWNT的SWNT FET。色谱法具有将甚至更大直径的半导体SWNT与其它起始材料分离的潜力,用于进一步改善SWNT FET的性能。

英文摘要:

It remains an elusive goal to achieve high performance single-walled carbon nanotube (SWNTs) field effect transistors (FETs) comprised of only single chirality SWNTs. Many separation mechanisms have been devised and various degrees of separation demonstrated, yet it is still difficult to reach the goal of total fractionation of a given nanotube mixture into its single chirality components. Chromatography has been reported to separate small SWNTs (diameter less than 0.9nm) according to their diameter, chirality and length. The separation efficiency decreased with increasing tube diameter by using ssDNA sequence d(GT)n (n=10-45). Here we report our result on the separation of single chirality (10,5) SWNTs (diameter = 1.03nm) from HiPco tubes with ion exchange chromatography. The separation efficiency was improved by using a new DNA sequence (TTTA)3T which can recognize SWNTs with the specific chirality (10,5). The chirality of the separated tubes was examined by optical absorption, Raman, photoluminescence excitation/emission and electrical transport measurement. All spectroscopic methods gave single peak of (10,5) tubes. The purity was 99% according to the electrical measurement. The FETs comprised of separated SWNTs in parallel gave Ion/Ioff ratio up to 106 owning to the single chirality enriched (10,5) tubes. This is the first time that SWNT FETs with single chirality SWNTs were achieved. The chromatography method has the potential to separate even larger diameter semiconducting SWNTs from other starting material for further improving the performance of the SWNT FETs.

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