Designing highly reliable and practical microwave absorbers is one of the most important research directions in the microwave absorbing field.Many absorbents suffer from concentration-sensitivity and environmental-sen...Designing highly reliable and practical microwave absorbers is one of the most important research directions in the microwave absorbing field.Many absorbents suffer from concentration-sensitivity and environmental-sensitivity dilemmas in practical applications.Here,sea urchin-like aggregates of MnO_(2)nanotubes were synthesized by a simple hydrothermal method,which exhibit an outstanding impedance matching characteristic.The composites based on sea urchin-like aggregates of MnO_(2)nanotubes show excellent microwave absorption performance in a wide concentration domain from 20 wt.%to 70 wt.%,corresponding to electrical conductivities from 1.86×10^(−7)to 1.85×10^(−5)S/m.Such a wide concentration range of absorbent for excellent microwave absorption is mainly attributed to the beneficial impedance matching properties of sea urchin-like aggregates of hollow nanotubes.A competitive absorption bandwidth of 3.36 GHz is achieved at 1 mm thickness,which can be broadened to 13.4 GHz by structural design.This work shows a new scheme for designing reliable and practical microwave absorbers benefit from the wide absorbent concentration domain.展开更多
基金the National Natural Science Foundation of China(Nos.62175010 and 62005010)Aeronautical Science Foundation of China(No.202000270S9002).
文摘Designing highly reliable and practical microwave absorbers is one of the most important research directions in the microwave absorbing field.Many absorbents suffer from concentration-sensitivity and environmental-sensitivity dilemmas in practical applications.Here,sea urchin-like aggregates of MnO_(2)nanotubes were synthesized by a simple hydrothermal method,which exhibit an outstanding impedance matching characteristic.The composites based on sea urchin-like aggregates of MnO_(2)nanotubes show excellent microwave absorption performance in a wide concentration domain from 20 wt.%to 70 wt.%,corresponding to electrical conductivities from 1.86×10^(−7)to 1.85×10^(−5)S/m.Such a wide concentration range of absorbent for excellent microwave absorption is mainly attributed to the beneficial impedance matching properties of sea urchin-like aggregates of hollow nanotubes.A competitive absorption bandwidth of 3.36 GHz is achieved at 1 mm thickness,which can be broadened to 13.4 GHz by structural design.This work shows a new scheme for designing reliable and practical microwave absorbers benefit from the wide absorbent concentration domain.
