Uniform core–shell PPy@carbon microsphere composites with a tunable shell thickness: the synthesis and their excellent microwave absorption performances in the X-band

摘要: Highly uniform core–shell polypyrrole@carbon microspheres (PPy@CM) have been successfully constructed by oxidation polymerization of pyrrole as the shell on core carbon microspheres. The thickness PPy can be easily controlled modulating weight ratio monomer and Hydrophilic with abundant hydroxyl groups a very strong affinity to conjugated chains PPy, which is responsible for spontaneous formation structure. Coating could increase complex permittivity dielectric loss due an additional interfacial polarization. With proper shells, improved would induced. microwave absorbing properties PPy@CM powders were investigated dispersing them in paraffin wax 40 wt% frequency range 2–18 GHz. PPy@CM-0.6 (0.6 g CM) sample exhibits maximum reflection −38.1 dB at 11.6 GHz bandwidth less than −10 covering 11.17 12.26 3 mm. In addition, absorption peak sites composites modulated not only absorbers but also composite. Thus, considered new type promising lightweight satisfy applications 8–18 range.