Reduced graphene oxide decorated with in-situ growing ZnO nanocrystals: Facile synthesis and enhanced microwave absorption properties
Reduced graphene oxide decorated with in-situ growing ZnO nanocrystals: Facile synthesis and enhanced microwave absorption properties
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用原位生长的 ZnO 纳米晶体装饰的还原氧化石墨烯：易于合成并增强微波吸收性能
DOI：
10.1016/j.carbon.2016.06.084
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发表时间：
2016-11-01
期刊：
影响因子：
10.9
通讯作者：
Zhou, Yu
中科院分区：
文献类型：
--
作者：
Feng, Wei;Wang, Yaming;Zhou, Yu
采用原位生长的方法在还原氧化石墨烯(RGO)表面修饰了分散性好、粒度分布窄的氧化锌纳米晶。在无水乙醇中，氧化石墨烯(GO)通过与官能团相互作用吸附锌离子。添加羟基离子后，氧化锌的前驱体在氧化膜上形成，并在热处理后结晶，在此过程中氧化锌被还原。将不同质量分数(5、10、15、20wt%)的石蜡与RGO/ZnO纳米晶复合材料混合，考察其介电性能和微波吸收性能。当复合材料质量分数为15wt%时，样品的微波吸收性能最为突出，具有较强的吸收能力(最大反射损耗为-54.2分贝)、较宽的有效吸收带宽(6.7 GHz)和较小的厚度(2.4 mm)。讨论了复合材料的微波吸收机理，主要基于导电损耗和介电损耗。本文所研究的RGO/氧化锌纳米晶复合材料是一种非常有前途的强吸收、轻质微波吸收材料。(C)2016爱思唯尔有限公司。保留所有权利。
Reduced graphene oxide (RGO) was decorated with well dispersed ZnO nanocrystals with narrow grain size distribution by a facile in-situ growth strategy. Zinc ions were absorbed on graphene oxide (GO) sheets through interaction with functional groups in absolute ethanol. After adding hydroxyl ions, the precursor of ZnO formed on GO sheets and crystallized after thermal treatment during which the GO was reduced. The RGO/ZnO nanocrystals composites were mixed with wax with different mass fraction (5, 10, 15, 20 wt%) to examine the dielectric and microwave absorption properties. The sample loaded with 15 wt% composites exhibits the most prominent microwave absorption properties, with strong absorption (maximum reflection loss of -54.2 dB), broad effective absorption bandwidth (6.7 GHz) and small thickness (2.4 mm). The microwave absorption mechanism of the composites mainly based on the conduction loss and dielectric loss was discussed. The RGO/ZnO nanocrystals composites in this study are very promising as strong absorption and light weight microwave absorber. (C) 2016 Elsevier Ltd. All rights reserved.