4.7 Article

Weak epsilon-negative silver nanowires/polyimide metacomposites with extremely low losses

Journal

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2021.106755

Keywords

Metacomposites; Nanocomposites; Electrical property; Microstructures

Funding

  1. National Key Research and Development Program of China [2021YFE0100500]
  2. Zhejiang Provincial Key Research and Development Program [2021C01004]
  3. ZJNSF [LR20E010001]
  4. Aeronautical Science Foundation [2019ZF076002]
  5. Natural Science Foundation of China [51803119, 51871146, 51771108]
  6. Fundamental Research Funds for the Central Universities [2020XZZX002-10]
  7. Innovation Program of Shanghai Municipal Education Commission [2019-01-07-00-10-E00053]
  8. Shanghai Engineering Technology Research Centre of Deep Offshore Material [19DZ2253100]
  9. China Postdoctoral Science Foundation [2021M692756]

Ask authors/readers for more resources

In this study, a percolation network of silver nanowires was constructed in a polyimide matrix, resulting in a transformation of permittivity from positive to negative when the amount of nanowires exceeded the percolation threshold. By controlling the content of silver nanowires, a metacomposite with a weak negative permittivity of -16 and low dielectric loss was successfully prepared, featuring an ultralow percolating concentration.
Nowadays, materials with negative permittivity have attracted considerable attention owing to their potential extended applications to outperform or complement existing electromagnetic devices. However, high losses usually come with the inductive negative permittivity which would exhaust the incident electromagnetic waves and diminish the expected responses. In this work, silver nanowires (AgNWs) are prepared to construct percolation networks with an extremely low volume fraction of 0.57 vol% in polyimide (PI) matrix. The permittivity transforms from positive to negative when the amount of AgNWs exceeds the percolation threshold, which is ascribed to the inductive feature caused by plasma oscillation of the delocalized electrons in the AgNWs. Weak negative permittivity of -16 and low dielectric loss tangent of 0.07 are observed at 1 GHz thanks to the depressed plasma oscillation and featured ultralow percolating concentration of AgNWs. The AgNWs/PI metacomposite would play significant roles in application fields such as novel capacitors and coil-free inductors.

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