In the work presented here, flame conditions are tailored to create a synergy between various metallic additives (cobaltocene, nickelocene, cobalt acetylacetonate, and ferrocene) and the flame environment to synthesize the desirable product of single-wall carbon nanotubes. The flame conditions for synthesis of the nanotubes is explored by using C2H2, C2H4 and CO in combination with H-2, CH4 or air along with an inert carrier (He, Nz or Ar) over a range of concentrations. Possible mechanisms for the encapsulation of the particles within a carbonaceous matrix are considered.