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In Situ Scanning Electron Microscopy Crack Characterization and Resistance Evolution in Cyclically-Strained Ag

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Summary
This summary is machine-generated.

Understanding conductive ink degradation is vital for flexible electronics. This study reveals that crack widening and shearing within existing cracks, not delamination, drive resistance increases during cyclic loading.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Mechanical Engineering

Background:

  • The reliability of conductive inks under cyclic loading is crucial for flexible electronics.
  • Existing models for resistance increase during cycling lack a clear understanding of the underlying degradation mechanisms.

Purpose of the Study:

  • To elucidate the degradation mechanism of conductive inks under cyclic loading.
  • To correlate cracking behavior with changes in electrical resistance.

Main Methods:

  • In situ cyclic stretch experiments using scanning electron microscopy (SEM) synchronized with electrical resistance measurements.
  • Analysis of SEM images with digital image correlation (DIC) to map strain distribution.
  • Testing of two screen-printed conductive inks (PE874 and 5025) on different substrates (TPU and PI).

Main Results:

  • Fatigue damage primarily occurred within pre-existing cracks formed during initial stretching, not through delamination or surface crack extension.
  • Degradation mechanisms identified as crack widening and local shearing within cracks.
  • Crack depth varied by ink-substrate combination; partial through-thickness cracks in 5025/PI led to faster resistance increase due to more affected bridging material.
  • Higher strain amplitudes exacerbated crack widening and shearing, accelerating resistance increase.

Conclusions:

  • The study clarifies that crack widening and shearing are the primary drivers of electrical resistance increase in conductive inks under cyclic loading.
  • Ink and substrate properties significantly influence crack depth and degradation rates.
  • Understanding these mechanisms is critical for developing more durable conductive inks for flexible electronic applications.