Ultrathin and Light-Weight Graphene Aerogel with Precisely Tunable Density for Highly Efficient Microwave Absorbing

Jiaxin Ma, Wenhao Li, Yuchi Fan, Jiyi Yang, Qingkun Yang, Jiancheng Wang, Wei Luo, Weiwei Zhou, Naoyuki Nomura, Lianjun Wang, Wan Jiang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Graphene aerogel (GA) possessing good electrical conductivity and low weight has been widely considered as a promising candidate for high-performance microwave-absorbing (MA) materials. However, simultaneous realization of high reflection loss (RL), low thickness, and light weight remains very challenging for GA because of the trade-off between impedance match and attenuation ability. Herein, through use of (3-aminopropyl)triethoxysilane as a surface modifier and cross-linker, the GA materials with precisely controlled density are fabricated via a unique solvothermal protocol of zero-volume shrinkage. The density-controlled GA (4.5 mg·cm-3) exhibits a remarkable minimum RL (RLmin) of -50 dB at a thickness of 1.14 mm in the K-band, owing to the optimized dielectric properties. Moreover, even higher attenuation ability without sacrificed impedance match is obtained by incorporating magnetic Fe3O4@C microspheres into the density-controlled GA. Superior MA performance involving unprecedented RLmin of -54.0 dB and qualified bandwidth covering 80% of the K-band has been achieved in the superlight Fe3O4@C/GA composite at a thickness less than 1 mm, which is highly desirable for MA material applied in mobile devices.

Original languageEnglish
Pages (from-to)46386-46396
Number of pages11
JournalACS Applied Materials and Interfaces
Volume11
Issue number49
DOIs
Publication statusPublished - 2019 Dec 11

Keywords

  • FeO@C microsphere
  • composite
  • density control
  • graphene aerogel
  • microwave absorbing

ASJC Scopus subject areas

  • Materials Science(all)

Fingerprint Dive into the research topics of 'Ultrathin and Light-Weight Graphene Aerogel with Precisely Tunable Density for Highly Efficient Microwave Absorbing'. Together they form a unique fingerprint.

  • Cite this