期刊
ACS NANO
卷 14, 期 1, 页码 948-963出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b08244
关键词
chiral sorting; ATPE; SWCNT; dextran; PEG; polymer
类别
资金
- Deutsche Forschungsgemeinschaft (DFG) [FL 834/2-1, FL 834/2-2, FL 834/5-1, FL 834/7-1]
- Fund for Scientific Research Flanders (FWO) [G040011N, G02112N, G035918N, G036618N]
- EOS-charming project [G0F6218N, 30467715]
- European Research Council [679841]
- Volkswagen Foundation
- European Research Council (ERC) [679841] Funding Source: European Research Council (ERC)
The enantiomer-level isolation of single-walled carbon nanotubes (SWCNTs) in high concentration and with high purity for nanotubes greater than 1.1 nm in diameter is demonstrated using a two-stage aqueous two-phase extraction (ATPE) technique. In total, five different nanotube species of similar to 1.41 nm diameter are isolated, including both metallics and semiconductors. We characterize these populations by absorbance spectroscopy, circular dichroism spectroscopy, resonance Raman spectroscopy, and photoluminescence mapping, revealing and substantiating mod-dependent optical dependencies. Using knowledge of the competitive adsorption of surfactants to the SWCNTs that controls partitioning within the ATPE separation, we describe an advanced acid addition methodology that enables the fine control of the separation of these select nanotubes. Furthermore, we show that endohedral filling is a previously unrecognized but important factor to ensure a homogeneous starting material and further enhance the separation yield, with the best results for alkane-filled SWCNTs, followed by empty SWCNTs, with the intrinsic inhomogeneity of water-filled SWCNTs causing them to be worse for separations. Lastly, we demonstrate the potential use of these nanotubes in field-effect transistors.
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