Characterization of Functional Groups on the Surface of Sonicated Carbon Nanotubes by Optical Spectroscopy Methods

Abstract

Carbon nanotubes (CNTs) due to their unique properties are used in the various applications. Oftentimes for using this material as a component of a composite material, uniform dispersion of CNTs particles plays vital role in the final properties of structure. Ultrasonication technique is one of the major methods for dispersion of carbon nanotubes in a suspension. On the other side, defects and functional groups on the surface of CNTs affect on the mechanical, electrical, and thermal properties of the final product. This study follows two major targets. The initial goal is the characterization of functional groups and defects on the surface of sonicated carbon nanotubes by helping of Fourier transform infrared (FTIR) and Raman spectroscopy. What follows is the study of relationship between sonication time and functional groups on the CNTs. In this regard, CNTs were sonicated in Jeffamine® D-230 polyetheramine and deionized water at different times and by different amount of energy. Characterization tests revealed significant changes on the surface of CNTs during sonication process. Current study clarifies what should be expected about surface chemistry of CNTs while ultrasonication process is selected as dispersion method.