Highly dispersive GO-based supramolecular absorber: Chemical-reduction optimization for impedance matching

• Published in: Journal of alloys and compounds Vol. 834; p. 155122
• Main Authors: Cui, Ru-Bin, Zhang, Chen, Zhang, Jun-Ying, Xue, Wei, Hou, Zhi-Ling
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 05.09.2020; Elsevier BV
• Subjects: Carrier mobility; Chemical reduction; Coating; Current carriers; Dispersion; Graphene; Graphene oxide; High dispersion; Impedance matching; Lattice matching; Microwave absorbers; Optimization; Putty; Radar absorbers; Structural design; Supramolecular; Three dimensional printing; Tunable absorption; Graphene oxide; Putty; Supramolecular; High dispersion; Tunable absorption
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2020.155122

Graphene composites have been considered as the most promising candidate for high-performance porous microwave absorber due to the 3D conductive network and multiple scattering. However, the severe impedance mismatch hinders graphene to be a thin radar absorbing coating that is urgently needed in electronic reliability and device integration. Here, a highly dispersive GO based supramolecular material was fabricated as a radar absorbing coating by self-assemble polymerization. The GO supramolecular, as a putty-like material, can achieve excellent impedance matching by controlling lattice-defects and activated charge-carrier mobility during chemical reduction. A qualified frequency bandwidth (Reflection loss < −10 dB) reaches 5.28 GHz covering almost the entire Ku band at 2 mm thickness. Moreover, the putty-like material exhibits so excellent processability to be easily customized into arbitrary shape by 3D printer, and it can achieves a qualified frequency bandwidth of 14.18 GHz after surface structural design. The results might shed a new light on the design of lightweight coating absorber. [Display omitted] •GOA material can achieve excellent impedance matching by controlling reduction time.•GOA can maintain stable microwave absorption due to the molecular-level dispersion.•GOA has excellent processability to be easily customized into arbitrary shape.