In this work, a novel design of poly (vinylidene fluoride)/carbon quantum dots (PVDF/CQDs) based flexible poling‐free hybrid material system able to efficiently convert small amounts of mechanical energy into electricity through the intrinsic piezoelectric nanostructures is reported. The PVDF/CQDs composite is fabricated through solution casting followed by a high‐pressure crystallization process. The introduction of 3D quasi‐spherical CQDs has in situ induced the self‐assembly of polymorphic substructures in the PVDF crystallites at high pressure, and piezoelectric 3D nanosheet arrays, 1D nanometer small sticks, and 1D nanowires, respectively, are formed in situ with the increase of CQDs concentration. Without any electrical polarization treatment, the maximum open‐circuit voltage output density of the durable composite system reaches 19.2 V cm⁻² and short‐circuit current output density of 550 nA cm⁻², both far exceeding that of pure PVDF. Simultaneously, owing to the successful incorporation of CQDs, the material shows excellent fluorescent effect with high stability, and its multicolor photoluminescence is well retained even after the endurance for a rigorous treatment at high pressure and high temperature. The as‐developed environmental friendly PVDF/CQDs compound may diversify niche applications in a new‐generation of self‐powered autonomous optoelectronic devices, biosensors, cell imaging, and so on.

中文翻译：

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纳米发电机开始发挥作用：一种新型的无极化压电系统，具有多色光致发光，作为高效的机电一体化开发平台

在这项工作中，报告了一种新颖的基于聚偏二氟乙烯/碳量子点（PVDF / CQDs）的灵活柔性无杂化材料系统设计，该系统能够通过固有的压电纳米结构将少量机械能有效地转化为电能。PVDF / CQDs复合材料是通过溶液浇铸和高压结晶过程制成的。3D准球形CQD的引入在高压下原位诱导了PVDF晶体中多态子结构的自组装，并分别在原位形成了压电3D纳米片阵列，1D纳米小棒和1D纳米线。 CQDs浓度增加。未经任何极化处理，耐用复合系统的最大开路电压输出密度达到19.2 V cm⁻²和550 nA cm ^-2的短路电流输出密度，均远超过纯PVDF的密度。同时，由于成功地掺入了CQD，该材料显示出优异的荧光效果和高稳定性，并且即使在耐高压和高温下的严格处理后，其多色光致发光也得以很好地保留。已开发的环保型PVDF / CQDs化合物可能会在新一代自供电的自主光电设备，生物传感器，细胞成像等领域中多样化利基应用。