Fig. 1 shows the schematic of our SPCVD reactor, which comprises
a spray nozzle, a vertical heating furnace, a quartz tube, and a
powder collector. The Pd/C2H5OH-mixed liquid was pumped into
the vertical CVD chamber with compressed argon gas, hydrogen,
and acetylene, to grow carbonaceous products at a temperature of
600e800 C. The synthesis period was 1 h. The synthesized
nanocarbonaceous products on the Pd catalysts were then
observed using scanning electron microscopy (SEM) and transmission
electron microscopy (TEM). Their graphite crystallinitywas
analyzed using Raman spectroscopy.