Well-ordered large-area arrays of epitaxial ferroelectric (Bi,La)4Ti3O12 nanostructures fabricated by gold nanotube-membrane lithography

Sung Kyun Lee; Woo Lee; Alexe, Marin; Nielsch, Kornelius; Hesse, Dietrich; Gösele, Ulrich
April 2005
Applied Physics Letters;4/11/2005, Vol. 86 Issue 15, p152906
Academic Journal
Two-dimensionally well-ordered, large-area arrays of epitaxial, ferroelectric, La-substituted Bi4Ti3O12 (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 SrTiO3 substrates, respectively. The ferroelectric properties are probed by piezoresponse scanning force microscopy. Non-c-axis-oriented BLT nanostructures show an effective piezoresponse coefficient (2dzz) of about 38.0 pm/V, whereas c-axis-oriented structures show one of only about 4.9 pm/V.


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