Dhanasekaran Aravinth, Malakar Amit, Lakshmanan A, Stranak Vitezslav, Bose Suryasarathi, Dhanaraj Kannadassan, Venugopal Velmurugan
School of Advanced Sciences, Vellore Institute of Technology, Vellore, Tamil Nadu 632014, India.
Department of Materials Engineering, Indian Institute of Science, C.V. Raman Avenue, Bangalore 560012, India.
ACS Omega. 2025 Jun 23;10(26):28143-28152. doi: 10.1021/acsomega.5c02527. eCollection 2025 Jul 8.
This study investigates the hybrid ternary composite of polyaniline (PANI), titanium dioxide (TiO), and molybdenum disulfide (MoS) to improve electromagnetic interference (EMI) shielding in high-frequency electronic devices. The study examines the shielding effectiveness (SE) of this hybrid composite by altering MoS concentrations. The composite was created through a four-stage in situ polymerization method, with MoS levels at 10, 20, and 30 wt % and a fixed TiO content of 10 wt %. A Vector network analyzer (VNA) was employed to measure EMI SE and complex permittivity in the 8.2-12.4 GHz frequency range. The composite with 20 wt % MoS exhibited the highest SE of 50.86 dB for 3 mm thickness, surpassing other formulations. The enhanced shielding performance is credited to the synergistic effects of MoS and TiO, which enhance the impedance matching, electrical conductivity, and electromagnetic wave dissipation. Further analysis revealed that factors, such as binding and agglomeration during in situ polymerization, along with electromagnetic absorption and multiple scattering mechanisms, significantly influence the shielding process. The results indicate that the optimized PANI/TiO/MoS hybrid composite shows promise as an effective EMI shielding material for cutting-edge electronic and communication applications.
本研究探讨了聚苯胺（PANI）、二氧化钛（TiO）和二硫化钼（MoS）的混合三元复合材料，以改善高频电子设备中的电磁干扰（EMI）屏蔽性能。该研究通过改变MoS浓度来考察这种混合复合材料的屏蔽效能（SE）。该复合材料是通过四阶段原位聚合法制备的，MoS含量为10%、20%和30%（重量），TiO的固定含量为10%（重量）。使用矢量网络分析仪（VNA）在8.2 - 12.4 GHz频率范围内测量EMI SE和复介电常数。对于3 mm厚度，含20%（重量）MoS的复合材料表现出最高的SE，为50.86 dB，超过了其他配方。屏蔽性能的增强归因于MoS和TiO的协同效应，其增强了阻抗匹配、电导率和电磁波耗散。进一步分析表明，原位聚合过程中的结合和团聚等因素，以及电磁吸收和多重散射机制，对屏蔽过程有显著影响。结果表明，优化后的PANI/TiO/MoS混合复合材料有望成为用于前沿电子和通信应用的有效EMI屏蔽材料。
