Facile Preparation of PbTiO3 Nanodot Arrays: Combining Nanohybridization with Vapor Phase Reaction Sputtering |
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Authors: | Jiyoon Kim Jongin Hong Moonkyu Park Wu Zhe Dongjin Kim Yu Jin Jang Dong Ha Kim Kwangsoo No |
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Institution: | 1. Department of Materials Science and Engineering, KAIST, 291 Daehak‐ro, Yuseong‐gu, Daejeon 305‐701, Korea;2. Department of Chemistry, College of Natural Sciences, Chung‐Ang University, 221 Heukseok‐dong, Dongjak‐gu, Seoul 156‐756, Korea;3. Department of Chemistry and Nano Science, Ewha Womans University, 52 Ewhayeodae‐gil, Seodaemun‐gu, Seoul 120‐750, Korea |
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Abstract: | A facile route is presented for the fabrication of spherical PbTiO3 (PTO) nanodot arrays on platinized silicon substrates using PbO vapor phase reaction sputtering on micellar monolayer films of polystyrene‐block‐poly(ethylene oxide) (PS‐b‐PEO) loaded with TiO2 sol–gel precursor. Short exposure to PbO transforms the amorphous TiO2 into polycrystalline PTO, while keeping the inherent size and periodicity of TiO2 nanodots. HRTEM images show that the spherical PTO nanodots, with an average size and height of 63 nm and 40 nm, respectively, are fixed on the Pt supported by residual carbon. XPS narrow scan spectra of Ti 2p and O 1s strongly verify the evolution of chemical identity and the reduction of the Ti‐O binding energy from TiO2 to PTO. The amplitude and phase images of piezoelectric force microscopy (PFM) confirm a multidomain structure attributed by the crystalline orientation of the PTO nanodots. Furthermore, the discrete PTO nanodots show remarkable switching properties due to the low strain field induced by the small lateral size, and the absence of domain pinning effects by grain boundary. |
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Keywords: | ferroelectrics PbTiO3 nanodot arrays self assembly piezoresponse force microscopy |
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