Abstract
PbTiO3 nanoislands were grown on Pt-covered SiO2/Si and SrTiO3 substrates by self assembly using metalorganic chemical vapor deposition (MOCVD) . Square-, triangular-prism- and pyramidal-shaped nanoislands with orderly in-plane direction were fabricated on Pt/SrTiO3 (001), (101) and (111) substrates, respectively, demonstrating structural control using epitaxial relationships. The size dependence of crystalline and domain structures was influenced by the experience of the phase transition from paraelectric to ferroelectric phase in the cooling process after MOCVD growth of nanoislands. Piezoresponse force microscopy revealed that the piezoelectric constant was dependent on not the width but the height in PbTiO3 (001) nanoislands with heights below 10 nm, suggesting intrinsic size effects. The minimum size of PbTiO3 (001) nanoislands showing ferroelectricity was 1.2 nm in height and 27 nm in width.
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