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Green, Michael ; Liu, Zhanqiang ; Xiang, Peng ; Liu, Yan ; Zhou, Minjie ; Tan, Xinyu ; Huang, Fuqiang ; Liu, Lei ; Chen, Xiaobo ( , Light: Science & Applications)
Abstract Although many materials have been studied for the purpose of microwave absorption, SiO2has never been reported as a good candidate. In this study, we present for the first time that doped, microwave conductive SiO2nanoparticles can possess an excellent microwave absorbing performance. A large microwave reflection loss (RL) of −55.09 dB can be obtained. The large microwave absorption originates mainly from electrical relaxation rather than the magnetic relaxation of the incoming microwave field. The electrical relaxation is attributed to a large electrical conductivity that is enabled by the incorporation of heterogeneous (N, C and Cl) atoms. The removal of the magnetic susceptibility only results in a negligible influence of the microwave absorption. In contrast, the removal of the heterogeneous atoms leads to a large decrease in the electrical conductivity and microwave absorption performance. Meanwhile, the microwave absorption characteristics can be largely adjusted with a change of the thickness, which provides large flexibility for various microwave absorption applications.