期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 47, 页码 32468-32476出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b11843
关键词
graphene; reduced graphene oxide; hexagonal boron nitride; 2D stacks; self-assembly; layer-by-layer; microwave-absorbing property
资金
- National Natural Science Foundation of China [11404397, 61574172]
- Hunan Provincial Natural Science Foundation for Distinguished Young Scholars [14JJ1001]
- Advanced Research Project of NUDT [JC11-01-01]
Sandwichlike hybrids of reduced graphene oxide (rGO) and hexagonal boron nitride (h-BN) were prepared via heat treatment of the self-assemblies of graphene oxide (GO) and ammonia borane (AB). TG-DSC-QMS analysis indicate a mutually promoted redox reaction between GO and AB; 900 degrees C is a proper temperature to transfer the hybrids into inorganic sandwiches. XRD, XPS, and Raman spectra reveal the existence of h-BN embedded into the rGO frameworks. High-resolution SEM and TEM indicate the layer-by layer structure of the hybrids. The content of h-BN can be increased with increase of the mass ratio of AB and the highest heat treatment temperature. The complex permittivity and the microwave absorption are tunable with the variation of the content of h-BN. When the mass ratio of GO/AB is 1:1, the microwave absorption of the hybrid treated at 900 degrees C is preferable in the range of 6-18 GHz. A minimum reflection loss, -40.5 dB, was observed at 15.3 GHz for the wax composite filled with 25 wt % hybrids at the thickness of 1.6 mm. The qualified frequency bandwidth reaches 5 GHz at this thickness with a low surface density close to 1.68 kg/m(2). The layer-by layer structure of the hybrid makes great contributions to the increased approaches and possibilities of electron migrating and hopping, which has both highly efficient dielectric loss and excellent impedance matching for microwave consumption.
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