Synthesis of the SiO2@C composites with high |
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Synthesis of the SiO2@C composites with high
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Abstract A series of core-shell SiO2@C microspheres with different size of SiO2 microspheres and thickness of conductive carbon black (CB) were prepared via carbothermal reduction method. The samples were characterized by SEM, TEM, XRD, XPS and Raman spectroscopy analyses. When the size of SiO2 microspheres or CB thickness was changed, the as-synthesized SiO2@C composites possessed diverse reflection loss (RL). Among, the electromagnetic wave (EMW) absorption performance of S-2 composite was optimal and its minimum reflection loss (RLmin) was up to −39.7 dB at the thickness of 3.8 mm and the effective bandwidth (RL ≤ −10 dB, 90% absorption) covered 1.3 GHz. Hence, it is the size of SiO2 microspheres and CB content that can tune the EMW absorption performance of the SiO2@C composites, which makes SiO2@C composites rather promising EMW absorption materials.
中文翻译：
摘要 采用碳热还原法制备了一系列具有不同SiO2微球尺寸和导电炭黑(CB)厚度的核壳型SiO2@C微球。通过SEM、TEM、XRD、XPS和拉曼光谱分析对样品进行表征。当 SiO2 微球的尺寸或 CB 厚度发生变化时，合成的 SiO2@C 复合材料具有不同的反射损耗（RL）。其中，S-2复合材料的电磁波（EMW）吸收性能最佳，其最小反射损耗（RLmin）在3.8 mm厚度和有效带宽（RL ≤ -10 dB, 90%吸收）覆盖 1.3 GHz。因此，SiO2 微球的大小和 CB 含量可以调节 SiO2@C 复合材料的 EMW 吸收性能， |
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