TY - JOUR
T1 - Lightweight and recoverable ANF/rGO/PI composite aerogels for broad and high-performance microwave absorption
AU - Zhou, Yue
AU - Wang, Shi-jun
AU - Li, Dian-sen
AU - Jiang, Lei
N1 - Funding Information:
The authors acknowledge the financial supports from by Excellent Young Scientist Foundation of NSFC (No.11522216); National Natural Science Foundation of China (No.11872087). Beijing Municipal Natural Science Foundation (No. 2182033); Aeronautical Science Foundation of China (No. 2016ZF51054); the 111 Project (No. B14009); Project of the Science and Technology Commission of Military Commission (No. 17-163-12-ZT-004-002-01); Foundation of Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province (No. 18kfgk01); Foundation of State Key Laboratory for Strength and Vibration of Mechanical Structures (No. SV2019-KF-32).
Publisher Copyright:
© 2021
PY - 2021/5/15
Y1 - 2021/5/15
N2 - Graphene is regarded as an excellent microwave absorbing material due to its low density and adjustable dielectric properties. In this paper, aramid nanofiber/reduce graphene oxide/polyimide (ANF/rGO/PI) composite aerogels were successfully prepared by a two-step method of freeze-drying and annealing. ANF and PI enhance the bonding force between rGO sheets. The unique three-dimensional conductive network of rGO not only provides a transmission path for electrons, but also enhances multiple reflection and scattering for electromagnetic waves. The defects on the surface of rGO during annealing caused dipole polarization, and a large number of heterogeneous interfaces between ANF, rGO and PI enhance the interface polarization. Good dielectric properties and structure make the material have excellent microwave absorption properties. At 10.8 GHz, the minimum reflection loss (RLmin) reaches −41.0 dB, the effective absorption bandwidth covers the X-band, and the thickness is 5.1–6.9 mm. In addition, the material also exhibited good mechanical properties and heat resistance, and was expected to become a low-density, high-performance high-temperature microwave absorbing material.
AB - Graphene is regarded as an excellent microwave absorbing material due to its low density and adjustable dielectric properties. In this paper, aramid nanofiber/reduce graphene oxide/polyimide (ANF/rGO/PI) composite aerogels were successfully prepared by a two-step method of freeze-drying and annealing. ANF and PI enhance the bonding force between rGO sheets. The unique three-dimensional conductive network of rGO not only provides a transmission path for electrons, but also enhances multiple reflection and scattering for electromagnetic waves. The defects on the surface of rGO during annealing caused dipole polarization, and a large number of heterogeneous interfaces between ANF, rGO and PI enhance the interface polarization. Good dielectric properties and structure make the material have excellent microwave absorption properties. At 10.8 GHz, the minimum reflection loss (RLmin) reaches −41.0 dB, the effective absorption bandwidth covers the X-band, and the thickness is 5.1–6.9 mm. In addition, the material also exhibited good mechanical properties and heat resistance, and was expected to become a low-density, high-performance high-temperature microwave absorbing material.
KW - Aerogel
KW - Graphene
KW - Microwave absorption
KW - Polyimide
UR - http://www.scopus.com/inward/record.url?scp=85101822459&partnerID=8YFLogxK
U2 - 10.1016/j.compositesb.2021.108701
DO - 10.1016/j.compositesb.2021.108701
M3 - Article
AN - SCOPUS:85101822459
SN - 1359-8368
VL - 213
JO - Composites Part B: Engineering
JF - Composites Part B: Engineering
M1 - 108701
ER -