Abstract
Shape memory polymers (SMPs) have recently emerged as the substrate for surface wrinkling with potential applications in smart adhesion and tunable optical gratings. In this paper, wrinkling of single-crystal silicon nanoribbons on epoxy SMP substrate is investigated experimentally and theoretically. With the unique shape fixing capability of SMPs, the well-defined wavy profile of silicon nanoribbons is obtained. A simple theoretical mechanics model, which bypasses the complex thermomechanical properties of SMPs, based on the existing wrinkling mechanics is proposed to explain the underlying physics behind the wrinkled silicon nanoribbons. Theoretical predictions on wavy profile agree very well with experiments. It is found that the wavy profile is independent of the recovery temperature, which is the high temperature TH above the transition temperature Tg. The material properties of SMPs at the transition temperature play a key role in determining the wavy profile. These results provide a scientific basis to design SMP-supported surface morphologies with important applications in smart surface engineering.
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