Sun Hyung Lee

Optical spectroscopic studies of photochemically oxidized single-walled carbon nanotubes

We examined the time-dependent changes in the optical properties of single-walled carbon nanotubes which were consecutively oxidized by irradiation with vacuum ultraviolet light. It is demonstrated that photochemical oxidation is a mild and controllable method for manipulating the surface of nanotubes in order to convert their affinity from hydrophobic to hydrophilic by controlling the density of functional groups on their sidewalls without destroying their tubular morphology.

An environmentally friendly dispersion method for cup-stacked carbon nanotubes in a water system

A dry process using VUV light was confirmed as a novel technique to attach functional groups onto cup-stacked carbon nanotubes and to develop their isolation in a water system without the use of dispersing agents.