Well-ordered large-area arrays of epitaxial ferroelectric (Bi,La)_4Ti_3O_(12) nanostructures fabricated by gold nanotube-membrane lithography

摘要

Two-dimensionally well-ordered, large-area arrays of epitaxial, ferroelectric, La-substituted Bi_4Ti_3O_(12) (BLT) nanostructures are prepared using gold nanotube membranes as a liftoff mask. Epitaxial nanostructures with a height of about 65 nm and a lateral size of about 150 nm, with either (001) ("c-axis") orientation, or mixed (118)/(100) ("non-c-axis") orientation, are obtained on (001)-and (011)-oriented SrTiO_3 substrates, respectively. The ferroelectric properties are probed by piezoresponse scanning force microscopy. Non-c-axis-oriented BLT nanostructures show an effective piezoresponse coefficient (2d_(zz)) of about 38.0 pm/V, whereas c-axis-oriented structures show one of only about 4.9 pm/V.