Green Synthesis of Porous Cocoon-like rGO for Enhanced Microwave-Absorbing Performances

Shanshan Wang, Yun Zhao*, Meimei Gao, Haoliang Xue, Yingchun Xu, Caihong Feng, Daxin Shi, Kaihui Liu, Qingze Jiao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

73 Citations (Scopus)

Abstract

A novel porous cocoon-like reduced graphene oxide (rGO) with high porosity and low density was fabricated by a simple and green reduction reaction using ascorbic acid as the reductant in combination with a freeze-drying process without annealing. The bulk density of porous cocoon-like rGO is only 28.49 mg/cm 3 , and the porosity reaches 94.57%. The reaction times have an important influence on the formation of porous cocoon-like rGO and the reduction degree of rGO. The porous cocoon-like rGO exhibits an excellent microwave-absorbing property with a low mass filling ratio of 7.0 wt %; its minimum reflection loss (RL) is -29.05 dB at 15.96 GHz with a sample thickness of 2.0 mm and the effective absorption bandwidth (RL < -10 dB) is 5.27 GHz. The microwave-absorbing property of porous cocoon-like rGO is much better than that of GO and other porous rGO. The in-depth analyses of the reduction degree, porosity, and microwave-absorbing performance illustrate that the microwave-absorbing performance of rGO is significantly related to the reduction degree and porosity. In addition, the synthetic route for porous cocoon-like rGO is simple, has low energy consumption, and is environmentally friendly. Our work demonstrates that the porous cocoon-like rGO is a promising lightweight microwave absorber with high performance.

Original languageEnglish
Pages (from-to)42865-42874
Number of pages10
JournalACS Applied Materials and Interfaces
Volume10
Issue number49
DOIs
Publication statusPublished - 12 Dec 2018

Keywords

  • cocoon-like
  • microwave-absorbing performance
  • porosity
  • reduced graphene oxide
  • reduction degree

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