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Related Concept Videos

Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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Ligand-Regulated Amorphous Transition Layer in Cu@Ag Core-Shell Composites for Boosting Electromagnetic Interference

Jiachang Ruan1, Rongzhi Zhao2, Jie Yang2

  • 1Key Laboratory for Anisotropy and Texture of Materials (MOE), School of Materials Science and Engineering, Northeastern University, Shenyang, China.

Small Methods
|March 18, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to control silver shell growth on copper nanoparticles, significantly improving electromagnetic interference (EMI) shielding. This technique enhances material properties for better radiation suppression.

Keywords:
alloy interlayercore–shell structureelectromagnetic interference shieldinghigh conductivitysignal attenuation

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Electromagnetic interference (EMI) shielding effectiveness of core-shell composites depends heavily on silver shell morphology and core-shell interface.
  • Controlling these features in-situ is difficult due to an unclear silver shell formation mechanism.

Purpose of the Study:

  • To present a ligand-regulated synthesis for precise control over silver shell growth on copper nanoparticles.
  • To investigate the impact of ammonia as a ligand on silver deposition kinetics and shell morphology.
  • To enhance the electromagnetic interference shielding performance of Cu@Ag core-shell composites.

Main Methods:

  • Utilized a liquid-phase reduction method with ammonia as a ligand to regulate silver shell growth.
  • Formed stable [Ag(NH3)2]+ complexes to modify silver ion deposition kinetics.
  • Analyzed the resulting silver shell morphology, core-shell interface, and electrical resistivity.

Main Results:

  • Ammonia-mediated growth resulted in uniform, particle-like silver shells and an Ag-Cu transition layer.
  • Electrical resistivity was reduced by several orders of magnitude (from 6.42 Ω·cm to 6.37 × 10⁻⁴ Ω·cm).
  • Optimized composites achieved an EMI shielding effectiveness of 85.4 dB, with a peak radiation suppression of 26.8 dB, further enhanced to 101.7 dB via stratification.

Conclusions:

  • Ligand regulation, specifically using ammonia, is an effective strategy for tailoring silver shell growth and enhancing EMI shielding.
  • The controlled synthesis offers a pathway to superior electromagnetic interference shielding materials.
  • The developed Cu@Ag core-shell composites show significant potential for advanced shielding applications.