| 簡 介： |
Synthesis of carbon nanofibers from the V-type pyrolysis flame is a new
method and it has wide application prospects. It needs simple laboratory equipments
and normal atmosphere pressure. The V-type pyrolysis flame experimental system is
introduced, involving V-type pyrolysis flame burner, mass flux controllers, sampling
substrate etc. The carbon nanofibers were characterized by scanning electron
microscope and transmission electron microscope. Carbon nanofibers with less
impurities and high quality can be captured when the temperature was from 800 to
880℃, austenitic stainless steel type304 was served as sampling substrate, nickel
nitrate was served as catalyst precursor and sampling time was 5 minutes. The carbon
nanofibers are from 100 to 200 nm in diameter and dozens microns in length. The
average diameter of catalyst particles is approximately from 20 to 50 nm. The effects
of temperature, sampling substrate materials, sampling time and catalyst were
analyzed. The temperature determined the diameter and shape of carbon nanofibers.
The austenitic stainless steel type304 substrate containing nickel is in favor of
synthesis of carbon nanofibers. The number of carbon nanofibers got more and more
while the diameter got thicker firstly and then had little change with the sampling time
increased within 5 minutes. In addition, experimental results also indicated that
carbon nanofibers had much impurity and worse morphology if the diameter of
catalyst particles was above 50nm. |
