In this work we report results concerning the nitrogen incorporation into multiwalled carbon nanotubes. Samples were grown by spray-pyrolysis and use ferrocene as catalist. As carbon source, toluene is used along two nitrogen precursors : acetonitrile and propionitrile. The main parameter investigated was the proportional fraction of precursors but the temperature role was also investigated. Characterization of the samples includes Raman spectroscopy, scanning and transmission electron microscopy and for evaluate proportional atomic and chemical concentrations in the tubes: XPS analysis. Few preliminary tests were performed using carbon nanotubes as gas sensors. Vapour of gasoline and ethanol data are sampled. Gases were tested also under reduced pressure conditions.