Role of pyrolysis reaction temperature and heating-rate in the growth and morphology of carbon nanostructures

- A low-cost, one-step pyrolysis route is devised to synthesize carbon nanostructures.
- High and low heating-rates favor formation of carbon- nanotubes and globules, respectively.
- Heating zone-length has no role on product morphology but increases product-yield.
- Higher graphitization and reduced Fe3C phase is observed with increasing Tsynthesis.
- Air-calcination decomposes Fe3C into smaller Fe-particles and forms annular graphitic layers.