Surfactant-Assisted Hydrothermal Synthesis of PMN-PT Nanorods

Abstract

The effects of surfactant polyacrylate acid (PAA) on shape evolution of 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 (0.7PMN-0.3PT) nanorods were studied. The results revealed that the polyacrylic acid content had great influence on the morphology of 0.7PMN-0.3PT. With increasing PAA concentration from 0.45 to 0.82 g/ml, the ratio of perovskite phase (PMN-PT nanorod) increased, while the ratio of pyrochlore phase decreased. When the PAA concentration was 0.82 g/ml, pure 0.7PMN-0.3PT nanorods were obtained. However, when PAA concentration was higher than 0.82 g/ml, the excess of PAA would hindered their [100] orientation growth. The piezoelectric coefficient d33 of 0.7PMN-0.3PT nanorod was obtained by linear fitting, and the d33 value was 409 pm/V.

PMN-PT/PVDF Nanocomposite for High Output Nanogenerator Applications

“…The output voltage ( V out ) can be calculated by the following equation: $V_{out}=true\int g_{33}\epsilon \left(l\right)Edl$ where g 33 is the piezoelectric voltage constant, ε( l ) is the strain perpendicular to the electrodes, E is Young’s modulus, and dl is the integration of nanorods perpendicular to the electrodes. The large piezoelectric coupling coefficient d 33 value of the 0.7PMN-0.3PT nanorod (409 pm/V) [16] and the piezoelectric PVDF matrix provide a large g 33 value. However, the Young’s modulus of the PMN-PT nanorod is much larger than that of the PVDF matrix.…”

“…After that, 0.05 mL of PAA and 20 g of KOH were added into the yellow solution with quickly stirring, and a white precipitate was formed. The suspension was sealed into a Teflon-lined stainless steel autoclave (80 mL in volume) and kept in an oven at 235 °C for 24 h. After cooling to room temperature, the suspension was washed with ethanol and DI water 6 times and dried at 100 °C in an oven for 6 h. Grey powder consisting of (100) oriented PMN-PT nanorods were obtained [16]. The yield of PMN-PT nanorods was over 78%.…”