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The dispersion of hydrophilized single-walled carbon nanotube (SWCNT) in organic solvent, through the modification of its surface by bidentate long-chain phosphonic acid with excellent heat resistance, and its structural characterization, through the formation of a monolayer on the water surface, have been performed. The surface-modified chains were developed by both hydrocarbon-based and fluorocarbon-based modifiers, and the arrangement of the organized films of each modified SWCNT was evaluated. The modified nanotubes were uniformly dispersed in toluene solvent, facilitating the confirmation of its lipophilicity, and spread as a monolayer at the air-water interface. The morphology of the organo-SWCNT monolayer was fibrous. In the Raman spectrum of the modified-SWCNT Langmuir-Blodgett multilayers, the defect-derived D band shifted to lower wavenumbers. The above experimental results confirmed the non-desorptive property of the modifiedbidentate chain. The packing and orientation of the modified chains were evaluated through out-of-plane and in-plane X-ray diffraction and polarized infrared spectroscopy. In addition, the monolayer of organo-SWCNT was densified with a small number of defects by the "repeating compression-expansion method". Furthermore, activation of the lysozyme enzyme from the subphase caused adsorption and immobilization onto organo-SWCNT monolayers. The introduction of SWCNTs to the air-water interface has revealed the potential for nanostructural control and the estimation of interactions between biomolecules.

A technique for improving the dispersibility of fluorocarbon-modified, singlewalled carbon nanotubes (SWCNTs) in fluorinated polymers was investigated. Furthermore, we aimed to achieve uniaxial orientation of SWCNT aggregates via a simple high-temperature drawing method to yield fluoropolymer-based nanocomposites containing uniform dispersed SWCNTs. Highly waterrepellent SWCNTs were mixed with phase-separable fluorinated polymers by the chemical modification of their surfaces with fluorocarbons. Introducing a fluorinated phosphonic acid surfactant with a high-sublimation temperature as the third component to improve dispersibility in the polymer matrix resulted in an innovative improvement. The uniform dispersed SWCNTs in the matrix improved the crystallinity, crystallization temperature, and mechanical characteristics of the composites. The high-temperature uniaxial orientation of the composite material reduced differences in the physical properties in the polymer due to differences in the initial dispersibility. This effect was expected since the drawing process promoted the deagglomeration of SWCNTs in the matrix. However, optimal physical properties were observed in SWCNT-oriented composite samples with an excellent initial dispersion.

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