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Nano-scaled onion-like carbon: Prospective material for microwave coatings

机译：纳米级洋葱状碳：用于微波涂层的潜在材料

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摘要

Microwave absorption properties of a novel electromagnetic material – onion-like carbon (OLC) produced by annealing of detonation nanodiamonds in vacuum – have been studied in microwave frequency range. The OLC electromagnetic (EM) absorption ability can be optimized by varying the nanocarbon cluster size and nanodiamond annealing temperature so that effectiveEMcoatings can be produced. Attenuation of EM waves in the 26–38 GHz frequency range had been studies for both OLC powder and polymer composites. For powder samples it was concluded that OLC aggregates with higher conductivity (higher annealing temperature of the precursor nanodiamond particles) and larger aggregate sizes provide higher efficiency for attenuation of the EM radiation. At the same time, when dispersed in a polymer matrix, more efficient shielding properties had been observed for OLC aggregates of the smallest sizes as compared to larger-sized aggregates at the same OLC loading. This is attributed due to the better dispersion and formation of a continuous conductive network by smaller aggregates (reaching the percolation threshold).
机译：在微波频率范围内，已经研究了一种新型电磁材料的微波吸收特性-爆轰纳米金刚石在真空中退火产生的洋葱状碳（OLC）。可以通过改变纳米碳簇的大小和纳米金刚石退火温度来优化OLC电磁（EM）吸收能力，从而可以生产有效的EM涂层。对于OLC粉末和聚合物复合材料，已经研究了26-38 GHz频率范围内的电磁波衰减。对于粉末样品，得出的结论是，OLC聚集体具有较高的电导率（前体纳米金刚石颗粒的较高退火温度）和较大的聚集体尺寸，从而为EM辐射衰减提供了更高的效率。同时，当分散在聚合物基质中时，在相同的OLC负载下，与较大尺寸的骨料相比，最小尺寸的OLC骨料具有更有效的屏蔽性能。这归因于较小的聚集体（达到渗透阈值）更好地分散和形成了连续的导电网络。

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