材料科学
微型多孔材料
反射损耗
微波食品加热
吸收(声学)
碳纤维
介电损耗
纳米颗粒
电介质
纳米技术
光电子学
复合材料
复合数
电信
计算机科学
作者
Da Li,Haoyan Liao,Hiroaki Kikuchi,Tong Liu
标识
DOI:10.1021/acsami.7b13538
摘要
Excellent magnetic features make Co-based materials promising candidates as high-performance microwave absorbers. However, it is still a significant challenge for Co-based absorbers to possess high-intensity and broadband absorption simultaneously, owing to the lack of dielectric loss and impedance matching. Herein, microporous Co@C nanoparticles (NPs) with carbon shell thicknesses ranging from 1.8–4.9 nm have been successfully synthesized by dealloying CoAl@C precursors. All of the samples exhibit high microwave absorption performance. The microporous Co@C sample possessing a carbon shell of 1.8 nm exhibits the highest absorption intensity among these samples with a minimum reflection loss (RL) of −141.1 dB, whose absorption bandwidth for RL ≤ −10 dB is 7.3 GHz. As the thickness of the carbon shell increases, the absorption bandwidth of the NPs becomes wider. For the sample with the carbon shell thickness of 4.9 nm, the absorption bandwidth for RL ≤ −10 dB reaches a record high of 13.2 GHz. The outstanding microwave attenuation properties are attributed to the dielectric loss of the carbon shell, the magnetic loss of the Co core, and the cooperation of the core–shell structure and microporous morphology. The strong wideband microwave absorption of the carbon-coated microporous Co NPs highlights their potential applications in microwave absorbing systems.
科研通智能强力驱动
Strongly Powered by AbleSci AI