研究目的
To explore the electromagnetic wave (EMW) absorbing materials to hold back the occurrence of the issues caused by wide application of electronic and wireless communication devices, such as electromagnetic pollution and interference.
研究成果
We develop a facile method to fabricate 3D sphere composed of magnetic transition-metal NP encapsulated NCNT arrays. Applied as EMW absorbers, the bimetal-based 3D architectures exhibit excellent EMW absorption properties, superior to the single-metal based 3D architectures and most of reported carbon-based absorbers. Experimental results indicate that the enhanced EMW absorption properties of the bimetal-based 3D architectures can be explained by their improved dielectric loss properties. Our results demonstrate that the design of 3D architectures composed of bimetal NP-encapsulated NCNT arrays is an efficient way for high-performance EMW absorbers.
研究不足
Slight agglomeration among our 3D architectures was observed, which may decrease their EMW absorption properties.
1：Experimental Design and Method Selection:
Metal Co and Ni glyceride spheres were first fabricated by a solvothermal method. Co(NO3)2·6H2O and Ni(NO3)2·6H2O were dissolved in the mixture of isopropanol and dicyandiamide uniformly, after 6 h solvothermal treatment under 180 oC, metal glyceride spheres with different metal ratios were synthesized. The metal glyceride spheres were transformed into hollow CoNi double hydroxide (CoNi-DH) spheres through a hydrothermal method at 150 oC for 3 h, and then used as catalysts for growing 3D CoNi NPs-encapsulated NCNT spheres at 700 oC for 2 hours under Ar atmosphere using dicyandiamide (DCD) as carbon and nitrogen sources.
2：Sample Selection and Data Sources:
Five precursors with the atomic ratio of Co to Ni of 1:0, 2:1, 1:1, 1:2 and 0:1 were used to synthesize 3D architectures, and the obtained samples were denoted as Co@NCNTS, Co2Ni1@NCNTS, Co1Ni1@NCNTS, Co1Ni2@NCNTS and Ni@NCNTS, respectively.
3：List of Experimental Equipment and Materials:
Co(NO3)2·6H2O, Ni(NO3)2·6H2O, isopropanol, dicyandiamide (DCD), Ar atmosphere.
4：Experimental Procedures and Operational Workflow:
The detailed experimental process, structural characterizations and the measurements of the electromagnetic parameters are described in ESI.
5：Data Analysis Methods:
The reflection loss (RL) was calculated to investigate EMW absorption property of an absorber.
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