Solubilization of Single‐Walled Carbon Nanotubes by using Polycyclic Aromatic Ammonium Amphiphiles in Water—Strategy for the Design of High‐Performance Solubilizers
作者： Yasuhiko Tomonari , Hiroto Murakami , Naotoshi Nakashima
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摘要: We describe the design of polycyclic aromatic compounds with high performance that dissolve single-walled carbon nanotubes (SWNTs). Synthetic amphiphiles trimethyl-(2-oxo-2-phenylethyl)-ammonium bromide (1) and trimethyl-(2-naphthalen-2-yl-2-oxo-ethyl)-ammonium (2) carrying a phenyl or naphtyl moiety were not able to dissolve/disperse SWNTs in water. By contrast, trimethyl-(2-oxo-2-phenanthren-9-yl-ethyl)-ammonium (3) solubilized SWNTs, although solubilization ability was lower than trimethyl-(2-oxo-2-pyrene-1-yl-ethyl)-ammonium (4) (solubilization behavior observed by using 4 described briefly reference 4a). Transmission electron microscopy (TEM), as well visible/near-IR, fluorescence, near-IR photoluminescence spectroscopies employed reveal properties water, compare these results those obtained sodium dodecyl sulfate (SDS) hexadecyltrimethylammonium (HTAB) solubilizers. Compound both as-produced (raw-SWNTs) purified under mild experimental conditions, better SDS HTAB. Near-IR measurements revealed chiral indices dissolved an aqueous solution quite different from micelles HTAB; for SWNTs/4 solution, intensity (7,6), (9,5), (12,1) strong chirality distribution narrower micellar solutions. This indicates has tendency semiconducting diameters range 0.89–1.0 nm, which are larger (0.76–0.97 nm)
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