Enhanced stretchability of metal/interlayer/metal hybrid electrode

Area of Science:

• Materials Science
• Electrical Engineering
• Nanotechnology

Background:

• Metal thin film electrodes offer excellent conductivity but lack mechanical stretchability, limiting their use in flexible electronics.
• Developing stretchable interconnect electrodes is crucial for wearable devices, soft robotics, and advanced displays.

Purpose of the Study:

• To engineer a novel stretchable hybrid electrode (SHE) that overcomes the limitations of traditional metal thin films.
• To improve the stretchability and durability of electrodes through grain size engineering and hybridization.

Main Methods:

• Utilized grain size engineering based on the Hall-Petch theory to enhance intrinsic metal film stretchability.
• Incorporated conductive interlayers, including poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) and carbon nanotubes (CNTs), to suppress crack propagation.
• Investigated the mechanical and electrical performance of the CNT-inserted SHE under tensile and fatigue testing.

Main Results:

• The CNT-inserted SHE demonstrated a reduced resistance change of approximately 32% during tensile testing.
• Achieved a significant 75% decrease in resistance change over 10,000 fatigue cycles.
• The electrode's rough surface effectively redistributed stress, preventing crack propagation and enhancing overall durability.

Conclusions:

• The proposed stretchable hybrid electrode (SHE) effectively combines enhanced stretchability and electrical stability.
• Grain size engineering and CNT hybridization are key strategies for creating robust, stretchable electronic components.
• This work paves the way for more reliable and durable stretchable interconnects in next-generation electronic devices.