Hollow engineering and component optimization strategy to construct flower-like yolk-shell structure SiO2@Void@C@WS2 multicomponent nanocomposites for microwave absorption

Abstract

Hollow engineering plays a crucial role in enhancing interfacial polarization, which is an essential factor in microwave absorption. Herein, an in-situ growth approach was adopted to successively coating C layer and WS2 nanosheets on the surface SiO2 nanosphere. The obtained results suggested that the formed SiO2@Void@C@WS2 multi-component nanocomposites (MCNCs) reveal a representative flower-like yolk-shell structure, which were manufactured massively through a simple channel. Additionally, the obtained SiO2@Void@C@WS2 MCNCs presented a more and more obvious yolk-shell structure and reduced WS2 content with decreasing the addition of SiO2@C or tungsten and sulfur sources. Because of their distinctive structures and remarkable cooperative effects, the SiO2@Void@C@WS2 displayed excellent microwave absorption performances. Through the majorization of hollow structure and WS2, improved properties of SiO2@Void@C@WS2 MCNCs could be acquired owing to their boosted polarization and conductive loss capabilities. Amongst, the resulting SiO2@Void@C@WS2 MCNCs exhibited the effective absorption band and minimum reflection loss values of 5.40 GHz and −45.50 dB with matching thicknesses of 1.78 and 1.55 mm, respectively. Therefore, our findings employed hollow engineering and optimization strategies for components to design and fabricate the yolk-shell structure flower-like MCNCs, which acted as highly efficient wide-band microwave absorbing materials.