Supraparamagnetic quaternary nanocomposites of graphene@Fe₃O₄@SiO₂@SnO₂: Synthesis and enhanced electromagnetic absorption properties

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• 作者：Lei Wang ; Ying Huang ; Xiao Ding ; Panbo Liu ; Meng Zong ; Xu Sun ; Yan Wang ; Yang Zhao
• 关键词：Graphene ; Nanocomposites ; Microwave absorption
• 刊名：Materials Letters
• 出版年：2013
• 出版时间：15 October, 2013
• 年：2013
• 卷：109
• 期：Complete
• 页码：146-150
• 全文大小：5918 K

文摘

Supraparamagnetic quaternary nanocomposites of graphene@Fe₃O₄@SiO₂@SnO₂ were prepared by combing the versatile sol-gel process and hydrothermal reaction. Transmission electron microscopy measurements show that Fe₃O₄@SiO₂@SnO₂ core-shell-shell nanostructures are fabricated on graphene surface. Compared with graphene@Fe₃O₄, the as-prepared graphene@Fe₃O₄@SiO₂@SnO₂ composites exhibit enhanced microwave absorption properties in terms of both the maximum reflection loss value and the absorption bandwidth. The maximum reflection loss of graphene@Fe₃O₄@SiO₂@SnO₂ is ?37.4 dB at 15.1 GHz and the absorption bandwidth with the reflection loss below ?10 dB range from 12 to 18 GHz with a thickness of 2 mm. Thus, the nanocomposites may have the potential as high-efficient absorber for microwave absorption applications.