Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-based Functional Materials and Devices &Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu 215123, P. R. China.
Sci Rep. 2016 Sep 6;6:32943. doi: 10.1038/srep32943.
Abundant disorderly-distributed surface functional groups, such as hydroxyl, carboxyl, ether and amino groups, endow an isolated graphene oxide quantum dot (GOQD) the polar property due to the symmetry breaking, although the aggregated counterparts present no polarization owing to the random orientation. Here, flexible polarized films were fabricated using aggregated GOQDs with the assistance of external electric fields and their polarization was confirmed with the electrostatic force microscopy and polarization-electric field hysteresis loop. Such polarized GOQD films may induce charges under externally applied deformation. Here, we fabricated nanogenerators based on the films, which gave out an average current value of 0.12 μA and an average voltage value of 12 V under a mechanical force of 60 N. This work has proposed a convenient electric-field-assisted method to give the nanomaterials new functions, which can be generalized to other materials and found applications in various fields.
丰富的无序分布的表面官能团，如羟基、羧基、醚基和氨基，由于对称性的破坏，赋予了孤立的氧化石墨烯量子点（GOQD）极性，尽管聚集的对应物由于随机取向而没有极化。在这里，使用聚集的 GOQDs 在外部电场的辅助下制备了柔性极化薄膜，并通过静电力显微镜和极化-电场滞后环确认了它们的极化。这种极化的 GOQD 薄膜在外部施加的变形下可能会引起电荷。在这里，我们基于这些薄膜制造了纳米发电机，在 60N 的机械力下，它们发出的平均电流值为 0.12μA，平均电压值为 12V。这项工作提出了一种方便的电场辅助方法，赋予了纳米材料新的功能，这种方法可以推广到其他材料，并在各个领域得到应用。
