Fabrication of arrays of lead zirconate titanate (PZT) nanodots via block copolymer self-assembly

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Varghese, Justin M.
Ghoshal, Tandra
Deepak, Nitin
O'Regan, Colm
Whatmore, Roger W.
Morris, Michael A.
Holmes, Justin D.
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American Chemical Society
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This Article presents a simple methodology for the fabrication of two-dimensional arrays of lead zirconate titanate (PZT) nanodots on n-doped Si substrates via the directed self-assembly of PS-b-PEO block copolymer templates. The approach produces highly ordered PZT nanodot patterns, with lateral widths and heights as small as 20 and 10 nm, respectively, and a coverage density as high as ∼68 × 109 nanodots cm–2. The existence of a perovskite phase in the nanodots was confirmed by X-ray diffraction and X-ray photoelectron spectroscopy. The piezo-amplitude and ferroelectric domain response obtained from the nanodots, through piezoresponse force microscopy, confirmed the presence of ferroelectricity in the PZT arrays. Notably, PZT nanodots with a thickness ∼10 nm, which is close to the critical size limit of PZT, showed ferroelectric behavior. The presence of a multi-a/c domain structure in the nanodots was attributed to their polycrystalline nature.
Block copolymer , Nanodot , PFM , Piezoelectric , PZT , Block copolymer self-assembly , Lead zirconate titanate , Nanodots , Piezoresponse force microscopy , PS-b-PEO block copolymers , Semiconducting lead compounds , Ferroelectric materials , Ferroelectricity , Nanostructured materials , Photoelectrons , Scanning probe microscopy , Self assembly , X-ray diffraction , X-ray photoelectron spectroscopy
VARGHESE, J., GHOSHAL, T., DEEPAK, N., O’REGAN, C., WHATMORE, R. W., MORRIS, M. A. & HOLMES, J. D. 2013. Fabrication of Arrays of Lead Zirconate Titanate (PZT) Nanodots via Block Copolymer Self-Assembly. Chemistry of Materials, 25, 1458-1463. http://dx.doi.org/10.1021/cm303759r
© 2013 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Chemistry of Materials, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/pdf/10.1021/cm303759r