Large-scale synthesis of monodispersed Si–B–N–O doped carbon hollow cages with microwave absorption property

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A novel method, combining polymerization and pyrolysis of single precursor on a silicon wafer, has been developed to synthesize monodispersed and Si–B–N–O doped carbon hollow cages in large-scale. The products have hollow architectures (2–3μm in diameter) with nano-pores on the spherical walls and a composition of Si0.03B0.1N0.03O0.04C0.8. The products exhibit the minimum reflection loss of −40.9dB at 12.0GHz (the effective reflection values are obtained in a very wide range of 3.8–17.5GHz) suggesting a new and high quality microwave absorbent.