Evidence of an Equimolar C₂H₂–CO₂ Reaction in the Synthesis of Carbon Nanotubes

Direct growth of carbon nanotubes on carbon fibers: Effect of the CVD parameters on the degradation of mechanical properties of carbon fibers

“…As we reported previously [31][32][33], the oxidative dehydrogenation reaction between C 2 H 2 and CO 2 was a highly reproducible approach yielding significantly enhanced activity and lifetime of the catalyst so that a high yield of CNTs could be obtained at low temperatures without any arduous catalyst activation prior to the growth. Indeed, the carbon fibers exposed to the oxidative dehydrogenation reaction of C 2 H 2 -CO 2 showed a weight difference which was positive for the whole temperature range from 500 °C to 750 °C and had a maximum at 650 °C with a weight gain of about 15 %.…”

The effect of CO2 on the CVD synthesis of carbon nanomaterials using fly ash as a catalyst

“…3(a) shows the spherical shape of the as-received y ash, while Fig. 19,20 On the other hand, it is possible that the rate of carbon supply exceeded the growth rate of CNTs, since this has been shown to result in the formation of amorphous carbon and bers as compared to tubes. Laser Raman conrmed the presence of both amorphous and graphitic carbon, as shown by a high D (disordered) peak and a low G (graphitic) peak Fig.…”

“…8(a)). 19 The thermal stabilities of the CNMs formed at the various temperatures are displayed in Fig. 8(b).…”

“…19 For example, the addition of oxygen which has been shown to act as a scavenger of hydrogen radicals, has provided conditions that were suitable for CNM synthesis. C 2 H 2 ) improves the yield of CNMs.…”

A novel Ca3(PO4)2–CaCO3support mixture for the CVD synthesis of roughened MWCNT-carbon fibres

“…Environmental aspects should also be taken into consideration because the solvents used during the purification process must be disposed of. To circumvent these environmental problems, the use of readily removable supports has been studied both by others and by us [29][30][31][32][33][34][35][36][37][38][39][40][41][42]. These supports include MgO, MgCO 3 , CaO, Ca(OH) 2 , CaCO 3 , etc.…”