Sahoo Raghunath, Sundara Ramaprabhu, Venkatachalam Subramanian
Microwave Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai, Tamil Nadu600036, India.
Alternative Energy and Nanotechnology Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai, Tamil Nadu600036, India.
ACS Omega. 2022 Nov 1;7(45):41426-41436. doi: 10.1021/acsomega.2c05204. eCollection 2022 Nov 15.
A thin and conductive coating on an environmentally friendly polymer is imperative for protecting sensitive electronic devices. In this regard, a series of silver nanowires (AgNWs) coated nitrocellulose (NC) papers are fabricated by a simple and fast processed vacuum-assisted filtration method by varying filtrate volume to address electromagnetic interference. Their structural and EMI shielding performance is analyzed. The submicron thick and the lighter paper reveal the conductive AgNWs interwoven on the rough NC surface, making a 2D in-planar structure. Due to a strongly interconnected network, the coated paper displays an exceptional electrical conductivity of 8603 S/m. Despite having a minimum AgNW coating thickness of ∼0.69 μm and an area density of 0.041 mg/cm, an ultrahigh EMI shielding effectiveness (SE) of about 69.4 dB (a specific EMI SE (SE/) of 1005797 dB/cm) in the entire X-band (8-12 GHz) region is achieved. The effective material parameters, extracted using plane-wave theory, indicate that AgNWs form closed current loops resulting in magnetic losses. These AgNWs coated NC papers synthesized by a simple procedure are promising EMI shielding materials for current emerging electronic devices.
在环保聚合物上形成一层薄的导电涂层对于保护敏感电子设备至关重要。在这方面，通过改变滤液体积，采用简单快速的真空辅助过滤法制备了一系列涂覆有银纳米线（AgNWs）的硝化纤维素（NC）纸，以解决电磁干扰问题。分析了它们的结构和电磁干扰屏蔽性能。亚微米厚且较轻的纸张显示出导电的AgNWs交织在粗糙的NC表面上，形成二维平面内结构。由于网络连接紧密，涂覆纸具有8603 S/m的优异电导率。尽管AgNW涂层的最小厚度约为0.69μm，面积密度为0.041 mg/cm，但在整个X波段（8 - 12 GHz）区域仍实现了约69.4 dB的超高电磁干扰屏蔽效能（SE）（特定电磁干扰SE（SE/）为1005797 dB/cm）。利用平面波理论提取的有效材料参数表明，AgNWs形成闭合电流回路，导致磁损耗。通过简单工艺合成的这些AgNWs涂覆的NC纸是当前新兴电子设备中很有前景的电磁干扰屏蔽材料。
