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Electric Field-Stimulated Autofluorescence for In Situ 3D Characterization of Polymer Defects.

Chaolu Niu1, Potao Sun1, Wenxia Sima1

  • 1State Key Laboratory of Power Transmission Equipment Technology, Chongqing University, Chongqing, 400044, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|September 19, 2025
PubMed
Summary
This summary is machine-generated.

A new method uses electric fields to make internal polymer defects glow, allowing for early detection before damage occurs. This technique provides 3D imaging of microscale structures in various polymers.

Keywords:
autofluorescenceelectric field effectin situ three‐dimensional characterizationmicroscale defect structurestimulated emission

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Area of Science:

  • Materials Science
  • Polymer Science
  • Analytical Chemistry

Background:

  • Internal defects in polymers like voids and electrical trees hinder advanced characterization.
  • These defects can degrade materials and lead to failure under electric stress.

Purpose of the Study:

  • To develop an in situ detection method for internal polymer defects.
  • To enable early, non-destructive characterization of microscale structures.

Main Methods:

  • Applying moderate electric fields to induce autofluorescence at defect sites.
  • Integrating electric field-stimulated autofluorescence with confocal laser scanning microscopy.
  • Utilizing 552 nm excitation for fluorescence amplification.

Main Results:

  • Selective autofluorescence induced at defect sites in various polymers (epoxy, polyethylene, silicone rubber, PDMS).
  • Achieved submicron 3D resolution for real-time visualization of defect dynamics.
  • Demonstrated electric field-induced changes in molecular orbital overlap and energy gaps.

Conclusions:

  • Electric field-stimulated autofluorescence is a probe-free, in situ method for 3D imaging of polymer microstructures.
  • This technique allows early detection of defects, preventing material degradation.
  • Establishes a broadly applicable platform for polymer analysis.