College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, PR China.
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, PR China.
J Colloid Interface Sci. 2019 May 1;543:138-146. doi: 10.1016/j.jcis.2019.02.053. Epub 2019 Feb 18.
Sulfur nanoparticles decorated bi-lamella composites with multiple interfaces were constructed by introducing a handful of nano-S particles into the interlayer of graphene and poly (3,4-ethylene-dioxythiophene): poly (styrenesulfonate) (GSP). Graphene and PEDOT: PSS with large surface areas and abundant functional groups offer adequate contact sites for the chemical confinement of sulfur nanoparticles. Based on the equivalent circuit theory, insulating sulfur could commendably regulate hopping conduction by slowing down the hopping electrons among the layers. Meanwhile, the substantial conductivity differences result in evident interfacial polarization (MWS effect). With the favorable permittivity behavior and multiple interfacial polarizations, more microwaves could be brought into the interior of absorber and were consumed. The GSP-paraffin composites with 35 wt% GSP loading possess the minimum reflection loss (RL) value of -21.9 dB at 1.6 mm, and effective absorption bandwidth of 4.72 GHz. This work demonstrates the significant role of multi-interfaces on microwave absorption.
硫纳米颗粒修饰的具有多层界面的双层复合材料是通过将少量纳米 S 颗粒引入到石墨烯和聚（3,4-亚乙基二氧噻吩）：聚（苯乙烯磺酸盐）（GSP）的层间来构建的。具有较大表面积和丰富官能团的石墨烯和 PEDOT：PSS 为硫纳米颗粒的化学限域提供了足够的接触位点。基于等效电路理论，绝缘硫可以通过减缓层间跳跃电子的跳跃来很好地调节跳跃传导。同时，显著的电导率差异导致明显的界面极化（MWS 效应）。具有良好介电性能和多层界面极化的 GSP-石蜡复合材料在 1.6mm 时具有最小的反射损耗（RL）值-21.9dB，有效吸收带宽为 4.72GHz。这项工作证明了多界面在微波吸收中的重要作用。
