Abstract
Carbon nanotubes are very stable systems having a considerable chemical inertness due to the strong sp 2 hybridized covalent carbon bonds on their surface. However, various applications of carbon nanotubes require their doping or chemical modification through the addition of atoms and/or molecules (covalently or noncovalently) in order to alter their physicochemical properties. In this chapter we review the importance of different types of doping in carbon nanotubes (single, double, and multiwalled). Regarding the location of the dopant species within the nanotubes, it is possible to classify the doping process as being exohedral (intercalation), endohedral (filling), and in-plane (replacing carbon atoms). The effects of doping on the electronic, vibrational, chemical, magnetic, and mechanical properties are discussed by analyzing the experimental results obtained with different spectroscopic techniques such as resonant Raman, X-ray photoelectron (XP), electron energy loss, and others. Applications of doped-carbon nanotubes are also summarized.
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