Home
Resources
Publications
Diameter- And Metallicity-Selective Enrichment of Single-Walled Carbon Nanotubes Using Polymethacrylates With Pendant Aromatic Functional Groups

Diameter- And Metallicity-Selective Enrichment of Single-Walled Carbon Nanotubes Using Polymethacrylates With Pendant Aromatic Functional Groups

Xiaoyong Pan, Lain-Jong Li, Mary B Chan-Park

Small. 2010 Jun 21;6(12):1311-20.

PMID: 20486222

Abstract:

Current methods for the synthesis of single-walled nanotubes (SWNTs) produce mixtures of semiconducting (sem-) and metallic (met-) nanotubes. Most approaches to the chemical separation of sem-/met-SWNTs are based on small neutral molecules or conjugated aromatic polymers, which characteristically have low separation/dispersion efficiencies or present difficulties in the postseparation removal of the polymer so that the resulting field-effect transistors (FETs) have poor performance. In this Full Paper, the use of three polymethacrylates with different pendant aromatic functional groups to separate cobalt-molybdenum catalyst (CoMoCAT) SWNTs according to their metallicity and diameters is reported. UV/Vis/NIR spectroscopy indicates that poly(methyl-methacrylate-co-fluorescein-o-acrylate) (PMMAFA) and poly(9-anthracenylmethyl-methacrylate) (PAMMA) preferentially disperse semiconducting SWNTs while poly(2-naphthylmethacrylate) (PNMA) preferentially disperses metallic SWNTs, all in dimethylforamide (DMF). Photoluminescence excitation (PLE) spectroscopy indicates that all three polymers preferentially disperse smaller-diameter SWNTs, particularly those of (6,5) chirality, in DMF. When chloroform is used instead of DMF, the larger-diameter SWNTs (8,4) and (7,6) are instead selected by PNMA. The solvent effects suggest that diameter selectivity and change of polymer conformation is probably responsible. Change of the polymer fluorescence upon interaction with SWNTs indicates that metallicity selectivity presumably results from the photon-induced dipole-dipole interaction between polymeric chromophore and SWNTs. Thin-film FET devices using semiconductor-enriched solution with PMMAFA have been successfully fabricated and the device performance confirms the sem-SWNTs enrichment with a highly reproducible on/off ratio of about 10(3).

Chemicals Related in the Paper:

Catalog Number	Product Name	CAS Number	Price
AP193419862	Fluorescein o-acrylate	193419-86-2	Price
AP31645348	9-Anthracenylmethyl acrylate	31645-34-8	Price
AP31645359	9-Anthracenylmethyl methacrylate	31645-35-9	Price
LS775124	Poly[(methyl methacrylate)-co-(9-anthracenylmethyl methacrylate)]		Price
LS775172	Poly[methyl methacrylate-co-(fluorescein O-acrylate)]		Price
LS775173	Poly[(methyl methacrylate)-co-(fluorescein O-methacrylate)]		Price
LS775174	Poly(9-anthracenylmethyl acrylate)		Price
LS775177	Poly(9-anthracenylmethyl methacrylate)		Price
LS775183	Poly(fluorescein O-acrylate)		Price

As a specialist in analytical chemical Products, Alfa Chemistry offers consumers a wealth of raw materials and a full range of technologies and services.

QUICK LINKS

HEADQUARTERS

Tel:

Fax:

Email: