Long Qin, Xu Zhiqiang, Xiao Huanhuan, Xie Kenan
School of Chemical Engineering, Sichuan University Chengdu Sichuan 610065 China
RSC Adv. 2018 Jan 3;8(3):1210-1217. doi: 10.1039/c7ra12190c. eCollection 2018 Jan 2.
Ferromagnetic metal nanoparticle/graphene nanocomposites are promising as excellent electromagnetic (EM) wave absorption materials. In this work, we used a facile method to synthesize a cobalt nanoparticle-graphene (CoNP-G) nanocomposite. The obtained CoNPs-G exhibited a saturation magnetization ( ) of 31.3 emu g and a coercivity ( ) of 408.9 Oe at 298.15 K. In particular, the CoNPs-G nanocomposite provided high-performance EM wave absorption with multiband, wide effective absorption bandwidth, which was mainly attributed to the synergy effects generated by the magnetic loss of cobalt and the dielectric loss of graphene. In the range of 2-18 GHz, the sample (55 wt% CoNPs-G) held three effective reflection loss (RL) peaks (frequency ranges of 2.4-3.84, 7.84-11.87 and 13.25-18 GHz, respectively, RL ≤ -10 dB) with the coating thickness of 4.5 mm, and the effective bandwidth reached the maximum of 10.22 GHz, and the minimal RL reached -40.53 dB at 9.50 GHz. Therefore, the CoNPs-G nanocomposite presents a great promising application in the electromagnetic wave absorption field.
铁磁金属纳米颗粒/石墨烯纳米复合材料有望成为优异的电磁波吸收材料。在本工作中，我们采用一种简便的方法合成了钴纳米颗粒-石墨烯（CoNP-G）纳米复合材料。在298.15 K下，所制备的CoNPs-G的饱和磁化强度（ ）为31.3 emu g，矫顽力（ ）为408.9 Oe。特别是，CoNPs-G纳米复合材料具有多频段、宽有效吸收带宽的高性能电磁波吸收特性，这主要归因于钴的磁损耗和石墨烯的介电损耗所产生的协同效应。在2-18 GHz范围内，该样品（55 wt% CoNPs-G）在涂层厚度为4.5 mm时出现三个有效反射损耗（RL）峰值（频率范围分别为2.4-3.84、7.84-11.87和13.25-18 GHz，RL≤-10 dB），有效带宽最大达到10.22 GHz，在9.50 GHz时最小RL达到-40.53 dB。因此，CoNPs-G纳米复合材料在电磁波吸收领域具有极具前景的应用。
