title: Selective microwave absorption of iron-rich carbon nanotube composites.
abstract: We report on high selectivity of microwave absorption by controlling the concentration of carbon nanotubes in polymer composites and matching the dielectric loss and magnetic loss through encapsulation of crystalline Fe nanorods inside nanotubes. The reflection loss reached more than 10 dB (> 90% absorption) by loading nanotubes at concentrations of 1 wt% to 10 wt% into the composites, and the frequencies corresponding to the maximum loss can be tailored throughout the range of 2 to 18 GHz by changing the concentration. A maximum absorption capability (75 dB x GHz) was observed at a CNT loading of about 4.5 wt%. The crystalline structure of encapsulated Fe nanorods can be modified to enhance the reflection loss. Control of absorption selectivity by modifying the structure and concentration of nanoscale fillers could facilitate potential higher-frequency applications (e.g., radar absorbing) of nanocomposites.
authors.affiliation: Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Xuchun
authors.initials: X
authors.lastname: Gui
authors.forename: Kunlin
authors.initials: K
authors.lastname: Wang
authors.forename: Anyuan
authors.initials: A
authors.lastname: Cao
authors.forename: Jinquan
authors.initials: J
authors.lastname: Wei
authors.forename: Ruitao
authors.initials: R
authors.lastname: Lv
authors.forename: Feiyu
authors.initials: F
authors.lastname: Kang
authors.forename: Qinke
authors.initials: Q
authors.lastname: Shu
authors.forename: Yi
authors.initials: Y
authors.lastname: Jia
authors.forename: Dehai
authors.initials: D
authors.lastname: Wu