Wei Zijian, Cai Yifan, Zhan Yanhu, Meng Yanyan, Pan Na, Jiang Xiancai, Xia Hesheng
School of Materials Science and Engineering, Liaocheng University, Liaocheng, 252000, P. R. China.
State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu, 610065, P. R. China.
Small. 2024 Mar;20(9):e2307148. doi: 10.1002/smll.202307148. Epub 2023 Oct 15.
From a material design perspective, the incorporation of Fe O @carbon nanotube (Fe O @CNT) hybrids is an effective approach for reconciling the contradictions of high shielding and low reflection coefficients, enabling the fabrication of green shielding materials and reducing the secondary electromagnetic wave pollution. However, the installation of Fe O nanoparticles on nonmodified and nondestructive CNT walls remains a formidable challenge. Herein, a novel strategy for fabricating the above-mentioned Fe O @CNTs and subsequently assembling segregated Fe O @CNT networks in natural rubber (NR) matrices is proposed. The advanced and unique structure, magnetism, and lossless conductivity endow the as-obtained Fe O @CNT/NR with a shielding effectiveness (SE) of 63.8 dB and a low reflection coefficient of 0.24, which indicates a prominent green-shielding capability that surpasses those of previously reported green-shielding materials. Moreover, the specific SE reaches 531 dB cm , exceeding that of those of previously reported carbon/polymer composites. Meanwhile, the outstanding conductivity enables the composite to reach a saturation temperature of ≈95 °C at a driving voltage of 1.5 V with long-term stability. Therefore, the as-fabricated Fe O @CNT/rubber composites represent an important development in green-shielding materials that are applied in cold environment.
从材料设计的角度来看，引入FeO@碳纳米管（FeO@CNT）杂化物是调和高屏蔽系数与低反射系数之间矛盾的有效方法，有助于制造绿色屏蔽材料并减少二次电磁波污染。然而，将FeO纳米颗粒安装在未改性且无损的碳纳米管壁上仍然是一项艰巨的挑战。在此，我们提出了一种新颖的策略来制备上述FeO@CNT，并随后在天然橡胶（NR）基体中组装分离的FeO@CNT网络。所获得的FeO@CNT/NR具有先进独特的结构、磁性和无损导电性，其屏蔽效能（SE）为63.8 dB，反射系数低至0.24，这表明其具有卓越的绿色屏蔽能力，超过了先前报道的绿色屏蔽材料。此外，其比屏蔽效能达到531 dB·cm，超过了先前报道的碳/聚合物复合材料。同时，优异的导电性使该复合材料在1.5 V的驱动电压下能够达到约95°C的饱和温度，并具有长期稳定性。因此，所制备的FeO@CNT/橡胶复合材料代表了在寒冷环境中应用的绿色屏蔽材料的一项重要进展。
