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Preparation and electromagnetic wave absorbing properties of 3D graphene/pine needle-like iron nano-acicular whisker composites

机译：3D石墨烯/松针状铁纳米针晶须复合材料的制备及电磁波吸收性能

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The improvement of high reflection loss and broad frequency bandwidth for electromagnetic wave absorption materials is a long-term effort. The superb micro-structures of the absorber have significant impact on increasing reflection loss and broadening frequency bandwidth. Herein, we prepared 3D graphene by chemical vapor deposition and then 3D graphene/pine needle-like iron nano-acicular whisker composites were in situ synthesized by an electrochemical deposition process under an electric field using 3D graphene as substrate. The nano-acicular whiskers show different sizes and the mean diameter of the individual iron nano-acicular whiskers was about 150 nm. The saturation magnetization (MS) of the 3D graphene/iron nano-acicular whisker composite was about 42.65 emu g?1 and the coercivity (Hc) was 143 Oe, and it shows good magnetic properties. In the frequency range of 2–18 GHz, the reflection loss value of the graphene/iron nano-acicular whisker composites with a thickness of 2 mm could reach ?12.81 dB at 10.95 GHz and the effective absorption bandwidth below ?10 dB was 2.16 GHz. The nano-acicular whiskers could effectively improve the electromagnetic wave absorbing properties. The results suggested that the as-prepared graphene/iron nano-acicular whisker nanocomposite showed great potential applications as a new absorber material.
机译：电磁波吸收材料的高反射损耗和宽带宽的改善是长期的努力。吸收体的精湛微观结构对增加反射损耗和拓宽频率带宽具有重大影响。本文中，我们通过化学气相沉积法制备了3D石墨烯，然后在电场下以3D石墨烯为基材通过电化学沉积工艺原位合成3D石墨烯/松针状铁纳米针状晶须复合材料。 。纳米针状晶须显示不同的尺寸，单个铁纳米针状晶须的平均直径约为150 nm。 3D石墨烯/铁纳米针状晶须复合材料的饱和磁化强度（ M S ）约为42.65 emu g ？1 和矫顽力（ H c ）为143 Oe，并且具有良好的磁性。在2-18 GHz的频率范围内，厚度为2 mm的石墨烯/铁纳米针状晶须复合材料的反射损耗值在10.95 GHz时可达到？12.81 dB，在？10 dB以下的有效吸收带宽为2.16 GHz。 。纳米针状晶须可有效提高电磁波吸收性能。结果表明，所制备的石墨烯/铁纳米针状晶须纳米复合材料作为新型吸收剂材料具有巨大的潜在应用前景。

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