,Doped, conductive SiO2 nanoparticles for large microwave absorption

• 作 者: Michael Green Zhanqiang Liu Peng Xiang Yan Liu Minjie Zhou Xinyu Tan Fuqiang Huang Lei Liu Xiaobo Chen
• 机 构: Department of Chemistry, University of Missouri, Kansas City, MO 64110, USA“,”State Key Laboratory o
• 出 处: 光：科学与应用（英文版）
• 发表日期: 2018年6期

Although many materials have been studied for the purpose of microwave absorption,SiO2 has never been reported as a good candidate.In this study,we present for the first time that doped,microwave conductive SiO2 nanoparticles 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.