Heteroatom substitution has been investigated to be a feasible way to optimize microwave absorption properties of core-shell structural nanocapsules at gigahertz. Although dielectric capacity has been increased at specific frequency with substituted absorbents, its broadband absorption performance is still relatively poor ascribed to the low dipole oscillation amplitude of single substituted heteroatom. In this study we demonstrate that sulfur and oxygen co-substituted heterostructure leads to high microwave absorption property of core-shell structural [email protected] nanocapsules at broadened frequency range, comparable to the single sulfur substitutional [email protected] nanocapsules. Experimental characterizations coupled with first-principles calculations reveal that the microwave absorption enhancement is triggered by the sulfur-oxygen co-substitution, which results in the serious symmetry breaking and thus leads to the charge separation at the co-substituted area. In particular, the nanocapsules exhibt -52 dB reflection loss capcacity at 6.8 GHz and its <-20 dB bandwidth is broaden to 1.51-4.82 mm. The present study not only offers a deep insight into the relationship between heteroatom and microwave absorption property, but puts forward a mentality for further designing microwave absorbents.

杂原子取代已被研究为优化核-壳结构纳米胶囊在千兆赫兹微波吸收性能的可行方法。虽然取代吸收剂在特定频率下的介电容量有所增加，但由于单个取代杂原子的低偶极振荡幅度，其宽带吸收性能仍然相对较差。在这项研究中，我们证明了硫和氧共取代的异质结构导致核壳结构纳米胶囊在更宽的频率范围内具有高微波吸收特性，与单硫取代纳米胶囊相当。实验表征与第一性原理计算表明，微波吸收增强是由硫氧共取代引发的，导致严重的对称性破缺，从而导致共取代区域的电荷分离。特别是，纳米胶囊在 6.8 GHz 时表现出 -52 dB 的反射损耗容量，其 <-20 dB 带宽扩大至 1.51-4.82 mm。本研究不仅深入了解杂原子与微波吸收性能之间的关系，而且提出了进一步设计微波吸收剂的思路。-20 dB 带宽扩大到 1.51-4.82 mm。本研究不仅深入了解杂原子与微波吸收性能之间的关系，而且提出了进一步设计微波吸收剂的思路。-20 dB 带宽扩大到 1.51-4.82 mm。本研究不仅深入了解杂原子与微波吸收性能之间的关系，而且提出了进一步设计微波吸收剂的思路。