This monograph explores the key methods of functionalizing and modifying carbon nanotubes with an eye toward their practical application in industry. It investigates the mechanisms of gas-phase and liquid-phase oxidation processes, secondary functionalization techniques, and modifications using polyaniline. The book also examines the properties of the resulting materials. Designed for researchers, graduate students, and educators specializing in nanotechnology, it is particularly suited for courses such as "Nanomaterials and Nanosystems Materials Science," "Chemistry of Nanomaterials," and "Properties of Carbon Nanomaterials." Published in Moscow by the Spectrum Publishing House in 2013, this comprehensive resource provides valuable insights into the methods of functionalization and modification of carbon nanotubes, making it an essential reference for advancing nanomaterials research and development.