| K0.5Na0.5(TaxNb1-x)O3(KNTN) materials with high curie temperature and large piezoelectric constant have attracted interests for the potential application in electro-mechanical energy conversion devices, sensors and actuators. In this paper, KNTN nanopowder was synthesized by hydrothermal process under certain conditions. The composition, structure, morphology and optical absorption properties were characterized by using modern analysis methods. The main research contents are concluded as follows:1、K0.5Na0.5(TaxNb1-x)O3(x=0.09-0.89) nanopowder were synthesized by hydrothermal process under certain conditions. The phase structure and morphology were characterized by XRD and SEM. The results show that with the increasing of Ta, the phase of the as-prepared samples changed from orthorhombic to tetragonal, and then to cubic phase of perovskite structure, together with the morphology changes from cuboid shape to cubic shape.2、The optical absorption properties were characterized by UV-vis absorption spectrum. Blue-shift happened with the absorption edge of KNTN when x increased from0.09to0.89, which should be due to Ta5+substitution of Nb5+.3、KNTN nanopowder were synthesized by hydrothermal process with different surfactants. The results show that PEG has a great impact on the phase and morphology of KNTN. It is available for the synthesis of K0.5Na0.5(Ta0.09Nb0.91)O3nanowires with638nm in diameter and12.3μm in length with the assistance of0.8g PEG.4. The electromechanical energy conversion of KNTN nanowires was measured as a nanogenerator fabricated by MEMS technology. The results show that nanogenerator can generate positive and negative output voltages under the transient external force (bending or pressing) due to piezoelectric effect in KNTN nanomaterials. The maximum output voltage was32mV. |
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