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首页> 外文期刊>RSC Advances >Uniform core–shell PPy@carbon microsphere composites with a tunable shell thickness: the synthesis and their excellent microwave absorption performances in the X-band
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Uniform core–shell PPy@carbon microsphere composites with a tunable shell thickness: the synthesis and their excellent microwave absorption performances in the X-band

机译：具有均匀壳厚度的均匀核壳PPy @碳微球复合材料：X波段的合成及其出色的微波吸收性能

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Highly uniform core–shell polypyrrole@carbon microspheres (PPy@CM) have been successfully constructed by oxidation polymerization of pyrrole as the shell on the core of carbon microspheres. The thickness of the PPy shell can be easily controlled by modulating the weight ratio of pyrrole monomer and carbon microspheres. Hydrophilic carbon microspheres with abundant hydroxyl groups have a very strong affinity to the conjugated chains of PPy, which is responsible for the spontaneous formation of the uniform core–shell structure. Coating the PPy shell on the carbon core could increase the complex permittivity and dielectric loss due to an additional interfacial polarization. With a proper thickness of the PPy shells, the improved dielectric loss would be induced. The microwave absorbing properties of the PPy@CM powders were investigated by dispersing them in paraffin wax with 40 wt% powders in the frequency range of 2–18 GHz. The PPy@CM-0.6 (0.6 g CM) sample exhibits the maximum reflection loss of ?38.1 dB at 11.6 GHz and a bandwidth of less than ?10 dB covering 11.17 to 12.26 GHz with the thickness of 3 mm. In addition, the absorption peak sites and bandwidth of the PPy@CM composites can be easily modulated not only by the thickness of the absorbers but also of the PPy shell of the PPy@CM composite. Thus, the PPy@CM composites can be considered as a new type of promising lightweight microwave absorbers to satisfy the applications of microwave absorption in the 8–18 GHz range.
机译：通过吡咯的氧化聚合作为碳微球核心的壳，已经成功地构建了高度均匀的核壳型聚吡咯@碳微球（PPy @ CM）。通过调节吡咯单体与碳微球的重量比，可以轻松控制PPy壳的厚度。具有大量羟基的亲水性碳微球对PPy的共轭链具有很强的亲和力，这是自发形成均匀核壳结构的原因。将PPy外壳涂在碳核上会由于附加的界面极化而增加复介电常数和介电损耗。在适当厚度的PPy壳的情况下，将引起改善的介电损耗。通过将PPy @ CM粉末分散在2-40 GHz频率范围内的40％粉末的石蜡中来研究其微波吸收性能。 PPy@CM-0.6（0.6 g CM）样品在11.6 GHz处表现出最大反射损耗为？38.1 dB，在11.17至12.26 GHz范围内的厚度为3 mm，其带宽小于1010 dB。另外，不仅可以通过吸收体的厚度而且可以通过PPy @ CM复合材料的PPy壳的厚度容易地调节PPy @ CM复合材料的吸收峰位和带宽。因此，PPy @ CM复合材料可以被视为一种新型的有前途的轻质微波吸收剂，可以满足8–18 GHz范围内的微波吸收应用。

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