In this study, the mesoporous carbon hollow spheres (MCHS) have been prepared through a facile hard-template etching strategy. It is confirmed that the tetrapropoxysilane (TPOS) has distinct influence on the dispersity, hollow cavity and shell thickness of MCHS. Furthermore, MCHS with different construction can regulate dielectric and microwave absorption effectively. We also proved that the generated hollow void and mesporous lay in carbon spheres could boost dielectric loss ability and impedance match behavior. When the addition of TPOS is 1.73 mL, the high specific surface area of MCHS can be achieved, in addition, the maximum reflection loss value of −50.9 dB at 11.1 GHz with a thickness of 3.2 mm can be gained. Moreover, corresponding effective bandwidth can be reached to 5.4 GHz ranging from 9.1 to 14.5 GHz. Besides, MCHS prepared by 3.46 mL TPOS can achieve broad bandwidth of 6.5 GHz (from 11.2 to 17.7 GHz) under 2.0 mm. The excellent microwave absorption capability of MCHS can be ascribed to the strong dielectric loss, hollow void and mesoporous in carbon shell, which were beneficial to the reflection and absorption of the microwave. Such light and efficient absorbers may be as predominant candidate for the applied in microwave absorption territory.

中文翻译：

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合理调控介孔碳空心球复杂介电参数进行高效微波吸收

在这项研究中，介孔碳空心球 (MCHS) 已通过简单的硬模板蚀刻策略制备。证实四丙氧基硅烷(TPOS)对MCHS的分散性、空腔和壳厚度有明显影响。此外，不同结构的 MCHS 可以有效地调节介电和微波吸收。我们还证明，在碳球中产生的空洞和介孔可以提高介电损耗能力和阻抗匹配行为。当 TPOS 的加入量为 1.73 mL 时，可以实现 MCHS 的高比表面积，此外，在 3.2 mm 的厚度下，在 11.1 GHz 处可以获得 -50.9 dB 的最大反射损耗值。此外，相应的有效带宽可以达到 5.4 GHz，范围从 9.1 到 14.5 GHz。此外，MCHS 由 3. 46 mL TPOS 可在 2.0 mm 下实现 6.5 GHz（从 11.2 至 17.7 GHz）的宽带宽。MCHS优异的微波吸收能力可归因于碳壳的强介电损耗、中空空隙和介孔，有利于微波的反射和吸收。这种光且高效的吸收剂可能是微波吸收领域应用的主要候选者。