Modulation of electromagnetic wave absorption by carbon shell thickness in carbon encapsulated magnetite nanospindles-poly(vinylidene fluoride) composites

详细信息    查看全文

• 作者：Xiaofang Liu^a ; ¹ ; Xinrui Cui^a ; ¹ ; Yaxin Chen^a ; Xiao-Juan Zhang^b ; Ronghai Yu^a ; Guang-Sheng Wang^b ; ^{wanggsh@buaa.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Hua Ma^c
• 刊名：Carbon
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：95
• 期：Complete
• 页码：870-878
• 全文大小：2631 K

文摘

A series of Fe₃O₄/C core–shell nanospindles with different shell thickness have been synthesized by a wet chemical method and subsequent high-temperature carbonization. The thickness of carbon shell can be well adjusted from 9 to 32 nm by changing the addition amounts of resorcinol and formaldehyde precursors during the coating process. Structure and morphology characterizations reveal that the carbon shell is amorphous structure and uniformly encapsulates on porous Fe₃O₄ nanospindles. For the first time, a flexible Fe₃O₄/C/poly(vinylidene fluoride) (PVDF) composite absorber was prepared by embedding the core–shell Fe₃O₄/C nanospindles in PVDF matrix. The electromagnetic properties of the composite show strong dependence on the carbon-shell thickness. The impedance matching for electromagnetic absorption is improved by the synergy effect between Fe₃O₄ nanospindles and encapsulated carbon shell. The Fe₃O₄/C/PVDF composite with thick carbon shell exhibits strong electromagnetic wave absorbing ability with thin absorber thickness. The minimum reflection loss for the absorber with thickness of 2.1 mm can reach −38.8 dB.