The work presented focus on the properties of boron-doped single-walled carbon nanotubes (CBx-SWNT). Their production at different levels, purification and the challenges to characterize them have been investigated.

The direct substitution of carbon atoms in the hexagonal lattice of carbon nanotubes by heteroatoms has been explored over the last three decades. However, incorporating B specifically has been one of the most challenging tasks. Many experimental problems have been encountered towards the upscalabiliy of the synthesis in processes,
specially in commonly used methods like chemical vapor deposition (CVD). During  this research, different solutions were explored. For instance, a high vacuum CVD system was adapted for the evaporation of a unique solid source that contained boron and carbon in its stoichiometry.

 With this, record incorporation of B substitutional atoms was achieved reaching up to 13 and 6 at. % of substitutional B in as-grown and purified samples correspondingly. This is almost an order of magnitude larger of everything reported so far for materials alike. In a wider context, we have been able to master the production of
CBx-SWNT, control their degree of purity, and to understand the B incorporation profile. This leaves the research status at the level that perspective applications can start to be envisaged