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Stretchable Ag electrodes with mechanically tunable optical transmittance on wavy-patterned PDMS substrates.
Eun-Hye Ko1, Hyo-Joong Kim1, Sang-Mok Lee1
1Kyung Hee University, Department of Advanced Materials Engineering for Information and Electronics, 1 Seocheon, Yongin, Gyeonggi-do, 446-701, Republic of Korea.
Scientific Reports
|April 25, 2017
Summary
Researchers developed semi-transparent, stretchable silver (Ag) films on wavy polydimethylsiloxane (PDMS) substrates. This novel design enhances electrode stretchability and tunable transparency for advanced flexible electronics.
Area of Science:
- Materials Science
- Nanotechnology
- Polymer Science
Background:
- Stretchable and transparent electronics require robust electrode materials.
- Conventional electrodes often lack the mechanical stability needed for flexible devices.
- Silver (Ag) films offer good conductivity but can be brittle.
Purpose of the Study:
- To create semi-transparent, stretchable silver (Ag) films on wavy-patterned polydimethylsiloxane (PDMS) substrates.
- To enhance the mechanical stretchability and tunable optical properties of Ag electrodes.
- To demonstrate the feasibility of these electrodes for stretchable electronic applications.
Main Methods:
- Optimizing wavy-pattern parameters (UV-ozone treatment, pre-strain) of PDMS substrates.
- Investigating the effect of Ag film thickness on mechanical stretchability.
- Fabricating and testing semi-transparent Ag films on flat and wavy PDMS substrates.
- Conducting bending, hysteresis, and dynamic fatigue tests.
Main Results:
- Ag films on wavy PDMS exhibited superior stretchability (up to 20% strain) compared to flat substrates due to effective strain relief.
- Optical transmittance was tunable with substrate stretching.
- Smooth buckling of wavy PDMS enabled precise patterning of Ag interconnectors.
- Demonstrated feasibility through rigorous mechanical testing.
Conclusions:
- Wavy-patterned PDMS substrates significantly improve the stretchability of semi-transparent Ag electrodes.
- The developed electrodes are suitable for various stretchable electronic applications.
- This approach offers a pathway for high-performance flexible and wearable devices.
