NEST, Istituto Nanoscienze-CNR, Piazza S. Silvestro, 12, I-56127, Pisa, Italy.
Center for Biomolecular Nanotechnologies @UNILE, Istituto Italiano di Tecnologia, via Barsanti, I-73010, Arnesano, LE, Italy.
Adv Mater. 2017 Aug;29(29). doi: 10.1002/adma.201701031. Epub 2017 Jun 1.
Electromechanical coupling through piezoelectric polymer chains allows the emission of organic molecules in active nanowires to be tuned. This effect is evidenced by highly bendable arrays of counter-ion dye-doped nanowires made of a poly(vinylidenefluoride) copolymer. A reversible redshift of the dye emission is found upon the application of dynamic stress during highly accurate bending experiments. By density functional theory calculations it is found that these photophysical properties are associated with mechanical stresses applied to electrostatically interacting molecular systems, namely to counterion-mediated states that involve light-emitting molecules as well as charged regions of piezoelectric polymer chains. These systems are an electrostatic class of supramolecular functional stress-sensitive units, which might impart new functionalities in hybrid molecular nanosystems and anisotropic nanostructures for sensing devices and soft robotics.
通过压电聚合物链的机电耦合，使得可以调节活性纳米线中有机分子的发射。这种效应由由聚（偏二氟乙烯）共聚物制成的高度可弯曲的反离子染料掺杂纳米线阵列证明。在进行高精度弯曲实验时，发现染料发射发生可逆红移。通过密度泛函理论计算发现，这些光物理性质与施加到静电相互作用分子系统上的机械应力有关，即涉及发光分子以及压电聚合物链的带电区域的抗衡离子介导状态。这些系统是静电类超分子功能应激敏感单元，它们可能会为混合分子纳米系统和各向异性纳米结构赋予新的功能，用于传感设备和软机器人。
