Fig. 3: Stress relaxation of the membrane on a water droplet. | npj Flexible Electronics

Fig. 3: Stress relaxation of the membrane on a water droplet.

From: Single-crystalline-level properties of ultrathin SrRuO3 flexible membranes with wide and clean surface

Fig. 3

a Membrane floating on the water droplet is under stress; the associated stress is inversely proportional to the radius of curvature (R) and the membrane thickness (d). The contact angles (ϕ) between the water droplet and PET substrate decreased b from ~73.4° for untreated PET c to ~19.4° for oxygen-plasma-treated PET. Accordingly, the radius of curvature increased from 3.1 to 13.9 nm. Thus, we can transfer much thinner membranes with a clean surface and a wide area on oxygen-plasma-treated PET substrates.

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