Controllable and Large-Scale Synthesis of Carbon Nanofibers, Bamboo-Like Nanotubes, and Chains of Nanospheres over Fe/SnO2 and Their Microwave-Absorption Properties

Carbon nanofibers (CNFs), bamboo-like carbon nanotubes (CNTs), and chains of carbon nanospheres (CNSs) were produced selectively in large quantities in the pyrolysis of acetylene at 500, 600, and 700 degrees C, respectively, over Fe/SnO2 nanoparticles generated by means of a combined sol-gel and hydrogen-reduction method. One advantage of this approach is that there is no need Of using a dilute gas Such as argon or nitrogen. It is found that the pyrolysis temperature has considerable effect oil the yield, morphology, and microwave-absorption properties of the obtained materials. The corresponding yields of CNFs, bamboo-like CNTs, and chains of CNSs are high, up to 25595, 36791, and 37039%, respectively. Thus, a simple and environment-friendly approach has been proposed for Mass production of CNFs, bamboo-like CNTs, and chain of CNSs in I controllable manner. In addition, the as-prepared carbon materials are demonstrated to show good microwave-absorption properties. Oil the basis of the results, We propose it possible formation mechanism.