Metacomposites which unveil weakly negative permittivity have been regarded as a promising candidate for next-generation electronics. We propose to prepare such metacomposites by developing the core-shell structured WC/PPy composites. The regulation of properties, including reactance, conductivity, and permittivity, has been achieved by controlling the mass ratio of WC in the WC/PPy composite. Conductive networks are constructed when the WC fraction is increased to a certain level, leading to a weakly negative permittivity, which is related to the plasma oscillation of free electrons. Owing to Lorentz dielectric resonance, a frequency-regulated negative permittivity is also realized, which provides an alternative strategy to obtain negative permittivity. This work will push forward further research and applications of metacomposites.

具有弱的负介电常数的复合材料被认为是下一代电子产品的有希望的候选者。我们建议通过开发核-壳结构的WC / PPy复合材料来制备这种超复合材料。通过控制WC / PPy复合材料中WC的质量比，可以实现对电抗，电导率和介电常数等性能的调节。当WC分数增加到一定水平时，会形成导电网络，从而导致弱的负介电常数，这与自由电子的等离子体振荡有关。由于洛伦兹介电共振，还实现了频率调节的负介电常数，这提供了获得负介电常数的替代策略。这项工作将推动超复合材料的进一步研究和应用。