Carbon nanotube is a carbon allotrope whose unique characteristic is its 1D geometry, and that has outstanding mechanical, electronic, thermal, optical properties. Nonetheless, this material has been deeply studied from theoretical and experimental standpoints. From the experimental point of view, there is the interest to create a controlled synthesis of Carbon Nanotubes with optimized physical properties for specific purposes. Another contemporary research interest is on the synthesis of doped Carbon Nanotubes, with the objective of inducing new properties on the Nanotube. This thesis work focuses on the synthesis of, specifically, Boron doped Single Walled Carbon Nanotubes, and aims to study the feasibility of producing Carbon Nanotubes with controlled doping levels by changing the precursor substance, and to understand the new physical properties that arise from the incorporation of Boron heteroatoms on the Carbon Nanotube structure. In this thesis work, a review of the current literature about Carbon Nanotube science is conducted, with focus on the differences in properties between pristine and doped tubes. Then, the experimental setup and methodology is explained. Finally, the experimental results are analyzed in order to understand the new physics of Boron doped Single Walled Carbon Nanotubes, and answer the question of whether a controllable method has been developed to dope Carbon Nanotubes.