Enrichment of (8,4) single-walled carbon nanotubes through coextraction with heparin.
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.
Yan
Liang Yu
LY
School of Chemical & Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore.
Li
Weifeng
W
Fan
Xiao Feng
XF
Wei
Li
L
Chen
Yuan
Y
Kuo
Jer-Lai
JL
Li
Lain-Jong
LJ
Kwak
Sang Kyu
SK
Mu
Yuguang
Y
Chan-Park
M B
MB
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
D046911:Macromolecular Substances; D037742:Nanotubes, Carbon; D006493:Heparin