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Highly oriented growth of PbTiO_3 ferroelectric nanostructure directed by organic molecules under hydrothermal condition

YIN Si-min,REN Zhao-hui,CHAO Chun-ying,XIAO Zhen,LIU Zhen-ya,SHEN Ge,HAN Gao-rong(State Key Laboratory of Silicon Material,Department of Materials Science and Engineering and Cyrus Tang Center for Sensor Materials and Applications,Zhejiang University,Hangzhou Zhejiang 310027,China)  
Four organic molecules including ethyl alcohol,oleic acid,oleylamine and poly acrylic acid have been introduced into a hydrothermal process to modify the crystal growth of perovskite lead titanate(PbTiO3,PT) nanostructures.The resulting products were systematically characterized by using X-ray powder diffraction(XRD),scanning electron microscope(SEM),Raman scattering spectroscop,transmission electron microscope(TEM) and high-resolution TEM(HRTEM).Corresponding morphology of the samples changes from donut-like microplates,square nanoplates,broken cubes to aggregated nanoplates.The results indicated that the introduction of 10 mL ethyl alcohol was particularly favourable to form donut-like single-crystal microplates of PT with an average lateral length of about 5~20 μm and a thickness of about 150 nm.XRD,TEM and HRTEM results suggested that the donut-like single-crystal microplates of PT probably experience a strong preferential growth along ab crystal planar via an oriented attachment mechanism.It is proposed that a selective absorbance of ethyl alcohol molecules on the {001} planes of tetragonal perovksite PT plays a key role in a preferred precipitation of crystal nucleates and thus the formation of donut-like microplates.
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