Yi-Shan LIUPei-Pei GUO;;;
. 2011, 42(06): 17-0.
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Abstract: Using skin collagen fiber (CF) as raw material, Schiff base structure contained CF (Sa-CF) was synthesized through CF-salicylaldehyde reaction, then metal ions, including Fe3+, Mn2+, Co2+, Cu2+and Zn2+ were doped in Sa-CF to make M-Sa-CF radar waves absorbents. Sa-CF and M-Sa-CF were pressed and membranes were obtained. The probe method was used to determine conductivity of Sa-CF and M-Sa-CF membranes, and the arch measurement method was used to investigate their radar waves reflectance loss (RL) in the frequency range of 0.5~18.0 GHz. Experimental results indicated that the conductivity of CF was significantly increased three orders of magnitude after reacted with salicylaldehyde, and further increased after doping with metal ions. It was found that the conductivity of Zn2+ doped Sa-CF was 8.37×10-4 S?cm-1. The electric-loss is the radar waves absorption mechanism of Sa-CF and M-Sa-CF . The conductivity of Sa-CF is increased after doped with metal ions, and therefore their absorbing strength are also increased. However, the radar waves reflectance loss (RL) of M-Sa-CF is quite different when doped with different metal ions. The greatest RL of Fe-Sa-CF was 14.68 dB at 8.29 GHz, while Cu-Sa-CF was only 8.35 dB at 8.29 GHz. It was found that the RL and frequency bandwidth of M-Sa-CF were greatly enhanced and widened respectively when doped with Fe3+, Mn2+ and Zn2+, which have the electronic configuration of half-full-shell and full-full-shell. With different dosage of doping, the greatest RL and its frequency location were also changed.