Graphene/Thermoplastic composite materials for EMI shielding applications

NanoXplore是一家总部位于蒙特利尔的先进材料公司，是加拿大最大的石墨烯生产商，也是世界上最大的石墨烯生产商之一。NanoXplore正计划将他们的材料用于电磁干扰（EMI）应用。NanoXplore的目标是在8 GHz及更高频率范围内的应用。射频（RF）应用材料开发人员面临的主要问题之一是材料的适当电磁特性。由于缺乏专业知识和设备，大多数公司基于dc特性进行测试，并基于反复试验来开发材料。对于用于高频应用的材料，直流测试提供的参数与高频时的实际参数相差甚远。尝试和错误的概念是昂贵和耗时的，不适合今天的高市场竞争力。该方案旨在为纳米探针新开发的用于汽车和航空航天屏蔽的材料提供适当的电磁特性。通过对几种石墨烯成分的电磁测量，我们可以预测每种样品的屏蔽效果，并提出达到所需屏蔽效果的合适的石墨烯成分比例。利用Concordia微波实验室的设备，使用几个频段的波导（高频传输波导）测量材料的反射和传输系数（称为s参数）。这些测量在一个反向过程中用于预测材料的电磁特性，这些特性用于预测材料的EMI屏蔽有效性。几个测量装置将被用来确定材料的各向异性。该项目的成果将有助于nanoxplore拥有新产品，并保持其作为加拿大公司在全球的领导地位。

NanoXplore is a Montreal-based advanced materials company, the largest Canadian producer of graphene andone of the largest graphene producers in the world. NanoXplore is planning to expand the use of their materialfor Electromagnetic Interference (EMI) applications. NanoXplore is targeting applications in the frequencyrange of 8 GHz and higher. One of the major problems that face material developer for Radio Frequency (RF)application is the proper electromagnetic characterization of the material. Most companies base their test onDC characterization due to lack of expertise and facilities and base their material development on trial anderror. For materials intended for high frequency application, DC tests provide parameters far from the actualparameters at high frequencies. Trial and error concept is costly and time consuming that is not appropriate fortoday's high market competitiveness. This proposal aimed at providing proper electromagnetic characteristicsfor the newly developed material by nanoXplore for shielding in automobiles, and aerospace application.Through the electromagnetic measurements of several graphene compositions, we should predict the shieldingeffectiveness of each sample and suggest the proper graphene composition ratio that achieves the requiredshielding effect.Using Concordia's facilities in the microwave laboratory, the material reflection and transmission coefficientsreferred to as S-parameters are measured using waveguides (high frequency transmission guide) of severalfrequency bands. These measurements are used in an inverse process to predict the electromagnetic propertiesof the material, which are used to predict the EMI shielding effectiveness of the material. Several measurementsetups will be used to determine the anisotropy of the material as well. The results of this project will helpnanoXplore to have a new product and maintain its leadership as a Canadian company all over the Globe.