Synthesis of high purity chain-like carbon nanospheres in ultrahigh yield, and their microwave absorption properties

摘要

Over Fe/SnO2 nanoparticles generated by a combined sol-gel/reduction method, high purity chain-like carbon nanospheres (CNSs) could be synthesized in large quantities through the catalytic decomposition of acetylene at 700 degrees C. The effect of SnO2 content on the yield, microstructure and microwave absorbing properties of the obtained CNSs were studied in detail. The results demonstrate that the content of SnO2 has a great impact on the yield and dimensions of the obtained CNSs, and an ultrahigh yield of 309 was reported. Moreover, the smaller size of chain-like CNSs, which can be obtained over the catalysts with higher SnO2 content, exhibit enhanced microwave absorption properties due to their better complementarities between the dielectric and magnetic tangent loss. Based on the results, we also discuss the possible formation mechanism of CNSs. Therefore, we propose a simple and environmentally-friendly route for the mass production of chain-like CNSs with high purity, and the assynthesized chain-like CNSs exhibit good microwave absorbing abilities.