期刊
SMALL
卷 6, 期 1, 页码 110-118出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.200900865
关键词
carbon nanotubes; chirality; heparin sodium salt; selectivity
类别
资金
- Singapore National Research Foundation [NRFCRP2-2007-02]
- Nanyong Technological University
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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