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Related Experiment Video

Updated: Jun 5, 2025

Planar and Three-Dimensional Printing of Conductive Inks
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High-Precision Printing Sandwich Flexible Transparent Silver Mesh for Tunable Electromagnetic Interference Shielding

Qixiang Wang1, Yuhui Feng1, Feifei Lin1

  • 1State Key Laboratory of Organic Electronics and Information Displays and Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, 9 Wenyuan, Nanjing 210023, People's Republic of China.

ACS Applied Materials & Interfaces
|December 12, 2024
PubMed
Summary

A new sandwich structure for flexible transparent conductive films (FTCFs) enhances electromagnetic interference (EMI) shielding by 40% without sacrificing optical transmittance. This innovation balances performance, material efficiency, and cost for advanced optoelectronic devices.

Keywords:
flexible transparent conductive filmshigh-precision printing technologysandwich silver meshessymmetric structural optimization strategytunable electromagnetic interference shielding performance

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Flexible transparent conductive films (FTCFs) are vital for optoelectronic devices, requiring electromagnetic interference (EMI) shielding.
  • Existing metal mesh FTCFs enhance EMI shielding effectiveness (SE) by increasing line width, reducing spacing, or mesh thickness, but this compromises optical transmittance and material efficiency.
  • A challenge persists in improving EMI SE while maintaining optical performance and material economy in metal mesh FTCFs.

Purpose of the Study:

  • To develop an innovative symmetric structural optimization strategy for silver mesh-based sandwich-FTCFs.
  • To achieve tunable EMI shielding performance with high optical transmittance and material efficiency.
  • To overcome the limitations of conventional methods in enhancing EMI SE for FTCFs.

Main Methods:

  • Proposed a symmetric structural optimization strategy using high-precision extrusion printing technology.
  • Achieved precise alignment of silver meshes on both sides of a transparent substrate through meticulous adjustment of xy-axis offsets and printing starting point.
  • Fabricated silver mesh-based sandwich-FTCFs with customized sizes.

Main Results:

  • The developed sandwich-FTCFs exhibit optical transmittance equivalent to single-layer FTCFs under identical parameters.
  • Achieved up to 40% enhanced EMI shielding effectiveness (SE) due to synergistic effects of multiple internal reflections and wave interference.
  • Demonstrated effective blocking of electromagnetic waves from common devices like mobile phones, Bluetooth earphones, and smartwatches.

Conclusions:

  • The symmetric structural optimization strategy successfully enhances EMI SE in FTCFs without compromising optical transmittance.
  • This approach offers a significant advancement in balancing optical transmittance, EMI SE, and material efficiency for high-performance, cost-effective FTCFs.
  • The developed sandwich-FTCFs are suitable for applications requiring robust electromagnetic shielding in optoelectronic devices.