Princeton Institute for Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, USA.
Nano Lett. 2013 Jun 12;13(6):2393-8. doi: 10.1021/nl400169t. Epub 2013 May 6.
Piezoelectric nanocomposites represent a unique class of materials that synergize the advantageous features of polymers and piezoelectric nanostructures and have attracted extensive attention for the applications of energy harvesting and self-powered sensing recently. Currently, most of the piezoelectric nanocomposites were synthesized using piezoelectric nanostructures with relatively low piezoelectric constants, resulting in lower output currents and lower output voltages. Here, we report a synthesis of piezoelectric (1 - x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-PT) nanowire-based nanocomposite with significantly improved performances for energy harvesting and self-powered sensing. With the high piezoelectric constant (d33) and the unique hierarchical structure of the PMN-PT nanowires, the PMN-PT nanowire-based nanocomposite demonstrated an output voltage up to 7.8 V and an output current up to 2.29 μA (current density of 4.58 μA/cm(2)); this output voltage is more than double that of other reported piezoelectric nanocomposites, and the output current is at least 6 times greater. The PMN-PT nanowire-based nanocomposite also showed a linear relationship of output voltage versus strain with a high sensitivity. The enhanced performance and the flexibility of the PMN-PT nanowire-based nanocomposite make it a promising building block for energy harvesting and self-powered sensing applications.
压电纳米复合材料是一类独特的材料，综合了聚合物和压电纳米结构的优势，最近在能量收集和自供电传感应用方面引起了广泛关注。目前，大多数压电纳米复合材料是使用压电常数相对较低的压电纳米结构合成的，导致输出电流和输出电压较低。在这里，我们报告了一种压电（1-x）Pb（Mg1/3Nb2/3）O3-xPbTiO3（PMN-PT）纳米线基纳米复合材料的合成，该复合材料在能量收集和自供电传感方面具有显著提高的性能。PMN-PT 纳米线具有较高的压电常数（d33）和独特的分层结构，PMN-PT 纳米线基纳米复合材料表现出高达 7.8 V 的输出电压和高达 2.29 μA 的输出电流（电流密度为 4.58 μA/cm2）；该输出电压是其他报道的压电纳米复合材料的两倍多，输出电流至少大 6 倍。PMN-PT 纳米线基纳米复合材料的输出电压与应变之间还表现出线性关系，具有较高的灵敏度。PMN-PT 纳米线基纳米复合材料的增强性能和柔韧性使其成为能量收集和自供电传感应用的有前途的构建模块。
