Because of tempting magnetic-dielectric synergies and interfacial effects, designing a simple and low-cost route for producing multidimensional carbon-based magnetic nanocomposites is very important for the development of microwave absorbers (MAs). In this paper, a facile and propagable Ni-nitrilotriacetic acid chelate (NAC) derived strategy was proposed to selectively fabricate zero-dimensional (0D)/one-dimensional (1D) porous Ni/C magnetic heterostructured nanorods (MHNRs) consisting of 1D carbon nanorod, lots of pores and 0D Ni nanoparticles via a combined hydrothermal and thermally treated methods. The porous Ni/C MHNRs displayed the progressively improved Ni and C crystallinity by controlling the temperature, which resulted in the tunable electromagnetic and microwave absorption properties (MAPs). Additionally, 0D/1D porous CoNi/C and Co/C MHNRs could be selectively produced through this strategy by adopting CoNi-NAC and Co-NAC as precursors. Benefiting from desirable interface and magnetic/dielectric synergies, the acquired 0D/1D porous Ni/C, CoNi/C and Co/C MHNRs presented excellent MAPs and certain corrosion resistance properties. In especial, Co/C MHNRs displayed a strong absorption capacity (−47.89 dB), an ultrawide effective absorption bandwidth (8.40 GHz) and small matching thicknesses (∼2 mm), which were a desirable candidate for MAs. Consequently, a facile, low-cost and propagable metal-NAC derived strategy was proposed to synthesize 0D/1D porous carbon-based MHNRs, which presented an alternative technique to develop lightweight efficient MAs.

中文翻译：

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金属-次氮基三乙酸螯合物衍生策略，选择性生产多孔 Ni/C、CoNi/C 和 Co/C 磁性异质结构纳米棒，用于轻质和强微波吸收


由于磁介电协同效应和界面效应，设计一种简单且低成本的路线来生产多维碳基磁性纳米复合材料对于微波吸收剂 （MA） 的发展非常重要。在本文中，提出了一种简单且可繁殖的 Ni-nitriktriacetic acid chelate， NAC） 衍生策略，通过水热和热处理相结合的方法，选择性地制造了由 1D 碳纳米棒、大量孔和 0D Ni 纳米颗粒组成的零维 （0D）/一维 （1D） 多孔 Ni/C 磁性异质结构纳米棒 （MHNR）。通过控制温度，多孔 Ni/C MHNR 显示出逐渐改善的 Ni 和 C 结晶度，从而产生了可调的电磁和微波吸收特性 （MAP）。此外，采用 CoNi-NAC 和 Co-NAC 作为前驱体，可以通过该策略选择性地生产 0D/1D 多孔 CoNi/C 和 Co/C MHNR。得益于理想的界面和磁性/介电协同效应，获得的 0D/1D 多孔 Ni/C、CoNi/C 和 Co/C MHNR 表现出优异的 MAP 和一定的耐腐蚀性。特别是，Co/C MHNR 表现出较强的吸收能力 （−47.89 dB）、超宽的有效吸收带宽 （8.40 GHz） 和小匹配厚度 （∼2 mm），是 MA 的理想候选者。因此，提出了一种简单、低成本和可繁殖的金属-NAC 衍生策略来合成 0D/1D 多孔碳基 MHNR，这为开发轻质高效 MA 提供了一种替代技术。