Morphology optimization strategy of flower-like CoNi2S4/Co9S8@MoS2 core@shell nanocomposites to achieve extraordinary microwave absorption performances

Chen Li; Qiong Peng; Xiaosi Qi; Yanli Chen; Xiu Gong; Xu Wang; Chaoyong Deng; Wei Zhong; Youwei Du

doi:10.1016/j.jcis.2021.08.085

Morphology optimization strategy of flower-like CoNi₂S₄/Co₉S₈@MoS₂ core@shell nanocomposites to achieve extraordinary microwave absorption performances

J Colloid Interface Sci. 2022 Jan 15;606(Pt 2):1128-1139. doi: 10.1016/j.jcis.2021.08.085. Epub 2021 Aug 16.

Authors

Chen Li¹, Qiong Peng², Xiaosi Qi³, Yanli Chen², Xiu Gong², Xu Wang⁴, Chaoyong Deng⁴, Wei Zhong⁵, Youwei Du⁶

Affiliations

¹ College of Physics, Guizhou Province Key Laboratory for Photoelectrics Technology and Application, Guizhou University, Guiyang City 550025, People's Republic of China.
² College of Physics, Guizhou Province Key Laboratory for Photoelectrics Technology and Application, Guizhou University, Guiyang City 550025, People's Republic of China; Key Laboratory of Electronic Composites of Guizhou Province, Guizhou University, Guiyang City 550025, People's Republic of China.
³ College of Physics, Guizhou Province Key Laboratory for Photoelectrics Technology and Application, Guizhou University, Guiyang City 550025, People's Republic of China; Key Laboratory of Electronic Composites of Guizhou Province, Guizhou University, Guiyang City 550025, People's Republic of China; National Laboratory of Solid State Microstructures and Jiangsu Provincial Laboratory for NanoTechnology, Nanjing University, Nanjing 210093, People's Republic of China. Electronic address: xsqi@gzu.edu.cn.
⁴ Key Laboratory of Electronic Composites of Guizhou Province, Guizhou University, Guiyang City 550025, People's Republic of China.
⁵ National Laboratory of Solid State Microstructures and Jiangsu Provincial Laboratory for NanoTechnology, Nanjing University, Nanjing 210093, People's Republic of China. Electronic address: wzhong@nju.edu.cn.
⁶ National Laboratory of Solid State Microstructures and Jiangsu Provincial Laboratory for NanoTechnology, Nanjing University, Nanjing 210093, People's Republic of China.

PMID: 34487933
DOI: 10.1016/j.jcis.2021.08.085

Abstract

Morphology optimization is an effective strategy to take full advantage of interface polarization for the improvement of electromagnetic wave attenuation capability. Herein, a general route was proposed to produce the flower-like core@shell structured MoS₂-based nanocomposites through a simple hydrothermal process. Through the in-situ hydrothermal reaction between the Mo and S sources on the surface of CoNi nanoparticles, flower-like core@shell structured CoNi₂S₄/Co₉S₈@MoS₂ nanocomposites could be successfully synthesized. By regulating the hydrothermal temperature, the flower-like geometrical morphology of samples could be effectively optimized, and the as-prepared sample (S2) synthesized at 200 °C displayed very excellent flower-like morphology compared to the samples (S1 and S3) obtained at 180 and 220 °C. Owing to the excellent interface polarization effect, the as-prepared S2 presented the evidently superior comprehensive microwave absorption properties in terms of strong aborption capability, wide absorption bandwidth and thin matching thicknesses compared to those of S1 and S3. The as-prepared core@shell structured CoNi₂S₄/Co₉S₈@MoS₂ sample with very excellent flower-like morphology simultaneously displayed the minimal reflection loss of -50.61 dB with the matching thickness of 2.98 mm, and the effective absorption bandwidth of 8.40 GHz with the matching thickness of 2.36 mm. Therefore, we provided a general route for the production of flower-like core@shell structured MoS₂-based nanocomposites, which could make the best of interface polarization to develop high-efficiency microwave absorbers.

Keywords: Core@shell structured CoNi(2)S(4)/Co(9)S(8)@MoS(2) nanocomposites; Extraordinary comprehensive microwave absorption properties; Flower-like geometrical morphology; Interface polarization.