POS5-1249
High-Yield and High-Purity Sorting of Semiconducting Single-walled Carbon nanotubes Using Conjugated Polymers and Molecular Cofactors
When and Where
Nov 30, -0001
00:00 - 00:00
Presenter(s)
ChaeYeon Han (Kongju National University)
Co-Author(s)
Abstract
Semiconducting single-walled carbon nanotubes (s-SWNTs) offer broad applicability in nanoelectronic and optoelectronic devices owing to their outstanding electrical and optical properties. However, synthesized SWNTs contain a mixture of semiconducting and metallic species, which constrains their use in semiconductor-based electronic devices. In addition, it remains challenging to simultaneously achieve high recovery yield and high purity during conjugated polymer extraction (CPE)-based separation.
Molecular cofactors were introduced into the CPE process to enhance the affinity between the conjugated polymer and s-SWNTs and to improve dispersion stability. The cofactors were selected based on structural features related to conjugated polymer–SWNT interactions, including aromatic, heteroaromatic ring-based, and alkyl-chain-based structures. By varying the molecular cofactor concentration, the effects of these structural features on SWNT dispersion, recovery yield, and purity were compared. The obtained fractions were evaluated using absorption spectra to determine the relative amount of extracted s-SWNTs and the presence of metallic SWNTs.
The four molecular cofactor conditions showed recovery yields of 17–20%, which were higher than the 10.8% obtained under the polymer-only condition, while purity was maintained within the range of 0.49–0.52. These values were above 0.400, indicating high s-SWNT purity (>99%). These results demonstrate that molecular cofactor structure and concentration can influence recovery yield and dispersion quality. Therefore, this work aims to propose cofactor-assisted CPE conditions that simultaneously improve recovery yield and dispersion quality for s-SWNT-enriched fractions.
Molecular cofactors were introduced into the CPE process to enhance the affinity between the conjugated polymer and s-SWNTs and to improve dispersion stability. The cofactors were selected based on structural features related to conjugated polymer–SWNT interactions, including aromatic, heteroaromatic ring-based, and alkyl-chain-based structures. By varying the molecular cofactor concentration, the effects of these structural features on SWNT dispersion, recovery yield, and purity were compared. The obtained fractions were evaluated using absorption spectra to determine the relative amount of extracted s-SWNTs and the presence of metallic SWNTs.
The four molecular cofactor conditions showed recovery yields of 17–20%, which were higher than the 10.8% obtained under the polymer-only condition, while purity was maintained within the range of 0.49–0.52. These values were above 0.400, indicating high s-SWNT purity (>99%). These results demonstrate that molecular cofactor structure and concentration can influence recovery yield and dispersion quality. Therefore, this work aims to propose cofactor-assisted CPE conditions that simultaneously improve recovery yield and dispersion quality for s-SWNT-enriched fractions.
