The hierarchical structure of polymers is notoriously difficult to control. Control over the hierarchical structures would

however

bridge the gap between structure

property of single chain and macroscopic structure

property of polymers. In this review

we summarized the recent research progress of our group in ferroelectric poly(vinylidene fluoride-trifluoroethylene). We have developed a simple nanoembossing protocol for simultaneously fabricating arrays of polymer nanostructures and controlling internal hierarchical structures. The application of the method to poly(vinylidene fluoride-trifluoroethylene)allows us to fabricate high-density arrays of ferroelectric nanostructures. The orientation of the polarization axis

about which the dipole moment rotates

is simultaneously aligned in plane over the whole patterned region. The improved crystal orientation translates to improved ferroelectric and piezoelectric properties such as lower coercive filed and higher pieozoelectric coefficient.