Enrichment of (8,4) Single‐Walled Carbon Nanotubes Through Coextraction with Heparin |
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| Authors: | Liang Yu Yan Weifeng Li Xiao Feng Fan Li Wei Yuan Chen Jer‐Lai Kuo Lain‐Jong Li Sang Kyu Kwak Yuguang Mu M B Chan‐Park |
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| Affiliation: | 1. School of Chemical & Biomedical Engineering Nanyang Technological University 62 Nanyang Drive, Singapore 637459 (Singapore);2. School of Biological Sciences Nanyang Technological University 60 Nanyang Drive, Singapore 637551 (Singapore);3. School of Physical and Mathematical Sciences Nanyang Technological University Nanyang Link, Singapore 637371 (Singapore);4. School of Materials Science and Engineering Nanyang Technological University Nanyang Avenue, Singapore 639798 (Singapore) |
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| Abstract: | Heparin sodium salt is investigated as a dispersant for dispersing single‐walled carbon nanotubes (SWNTs). Photoluminescence excitation (PLE) spectroscopy is used for identification and abundance estimation of the chiral species. It is found that heparin sodium salt preferentially disperses larger‐diameter Hipco SWNTs. When used to disperse CoMoCAT nanotube samples, heparin has a strong preference for (8,4) tubes, which have larger diameter than the predominant (6,5) in pristine CoMoCAT samples. PLE intensity due to (8,4) tubes increases from 7% to 60% of the total after threefold extractions. Computer modeling verifies that the complex of (8,4) SWNTs and heparin has the lowest binding energy amongst the four semiconducting species present in CoMoCAT. Network field‐effect transistors are successfully made with CoMoCAT/heparin and CoMoCAT/sodium dodecylbenzene sulfonate (SDBS)–heparin (x3), confirming the easy removability of heparin. |
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| Keywords: | carbon nanotubes chirality heparin sodium salt selectivity |
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