Controlled formation of nanoscale wrinkling patterns on polymers using focused ion beam

It has previously been shown that focused ion beam irradiation induces a wrinkled skin on the surface of polydimethylsiloxane. Here, it is demonstrated that the wavelength of the induced wrinkles and their morphology can be effectively selected by controlling the acceleration voltage and fluence of the ion beam. The capabilities of the technique are also extended by adopting the maskless patterning method of the focused ion beam system, which allows creation of controlled wrinkling patterns on small surfaces of polymers.