Metal films on polymer substrates stretched beyond 50

By Nanshu Lu, Xi Wang, Zhigang Suo, J. Vlassak. 2007

414 citations recorded by the source corpus.

When a freestanding plastically deformable metal film is stretched, it ruptures by strain localization, and the elongation is less than a few percent. When the film is deposited on a polymer substrate, however, strain localization may be retarded by the substrate. This paper reports Cu films deposited on Kapton substrates and stretched up to the rupture of the substrates (at an elongation between 50% and 60%). When Cr adhesion layers are introduced between Cu and Kapton, few microcracks in Cu may be found, and the measured electrical resistance agrees with a theoretical prediction. Micrographs show that the strain localization and debonding coevolve.

Subfields: Biomedical Engineering, Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/5d7a63d24a59ad16bc88e70c02236feb9564e455

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Biomedical Engineering

1. Nanshu Lu
2. Dae-Hyeong Kim
3. Zhigang Suo
4. J. Vlassak
5. Shixuan Yang
6. T. Widlund
7. Stefano Stassi
8. Yung-Yu Hsu

In Electrical and Electronic Engineering

1. Nanshu Lu
2. Dae-Hyeong Kim
3. Zhigang Suo
4. J. Vlassak

In Materials Chemistry

1. Nanshu Lu
2. Zhigang Suo
3. Dae-Hyeong Kim
4. J. Vlassak
5. Jian Zhu

Citations in the corpus

• Flexible Tactile Sensing Based on Piezoresistive Composites: A Review (2014, background): “When assuming constant both the resistivity and the volume of a metal film with resistance R, stretched to length L, having R0 and L0 as the corresponding initial values and mechanical strain ε [31,54]:”
• Flexible and Stretchable Electronics Paving the Way for Soft Robotics (2014, positive): “19 Two prevailing design strategies, that is, wrinkled nanoribbons/nanomembranes 20–22 and isolated device islands interconnected by noncoplanar 23–25 or serpentine-shaped metal wires, 26–28 were proven to be effective for minimizing strains in inorganic electronic materials.”
• The effect of film thickness on the failure strain of polymer-supported metal films (2010, methodology): “This observation is consistent with previous computational [14, 15] and experimental [27] studies.”
• Stretchability and compliance of freestanding serpentine-shaped ribbons (2014, background): “Although copper thin films well bonded to polyimide substrates have been stretched beyond 50% without fracture (Lu et al., 2007), most of the deformation is plastic and therefore, irreversible.”