Room temperature functionalization of carbon nanotubes using an ozone/water vapor mixture

tA method of carbon nanotubes (CNTs) oxidation at room temperature using ozone with added water vapor is described. The resulting CNTs were characterized by Fourier transform infrared, X-ray photoelectron spectroscopy, and scanning and transmission electron microscopy. These show that more oxygenated functional groups could be grafted onto the CNT surfaces due to the addition of water vapor, compared to traditional approaches in which high density of ozone is required. The existed hydroxyl radicals in the water vapor/ozone mixture is considered to be responsible for the increased CNT oxidizing degree.

A controllable covalent functionalization of carbon nanotubes using an ozone/water vapor mixture, which has the features of low density of ozone and at room temperature. (Left: TEM of as received MWCNTs and right: TEM of MWCNTs functionalized using an ozone/water vapor mixture).Figure optionsDownload as PowerPoint slideResearch highlights
► A controllable covalent functionalization of CNTs is provided.
► An important factor, water, in the oxidation of CNTs was revealed.
► The oxidation of CNTs can be carried out at room temperature.
► Low purity of ozone is needed.