title: Enrichment of (8,4) single-walled carbon nanotubes through coextraction with heparin.
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.
authors.affiliation: School of Chemical & Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore.
authors.forename: Liang Yu
authors.initials: LY
authors.lastname: Yan
authors.forename: Weifeng
authors.initials: W
authors.lastname: Li
authors.forename: Xiao Feng
authors.initials: XF
authors.lastname: Fan
authors.forename: Li
authors.initials: L
authors.lastname: Wei
authors.forename: Yuan
authors.initials: Y
authors.lastname: Chen
authors.forename: Jer-Lai
authors.initials: JL
authors.lastname: Kuo
authors.forename: Lain-Jong
authors.initials: LJ
authors.lastname: Li
authors.forename: Sang Kyu
authors.initials: SK
authors.lastname: Kwak
authors.forename: Yuguang
authors.initials: Y
authors.lastname: Mu
authors.forename: M B
authors.initials: MB
authors.lastname: Chan-Park
mesh_terms: D003460:Crystallization / Q000379:methods*; D006493:Heparin / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D052616:Solid Phase Extraction / Q000379:methods; D013499:Surface Properties
chemical_list: D046911:Macromolecular Substances; D037742:Nanotubes, Carbon; D006493:Heparin