通过化学裁剪法打开碳纳米管获得了粒径一致、性能稳定、具有蓝色荧光的石墨烯量子点。该方法属于化学溶液法,具有成本低廉、工艺简单、条件易控等优势。将该样品与半导体聚合物按一定比例混溶, 通过旋涂技术形成基于石墨烯量子点掺杂的聚合物复合薄膜, 进而制成柔性存储器。该柔性可弯曲存储器具有低驱动电压、接近103的ON/OFF 比率、较好的循环次数, 较好的重复性和稳定性。该研究结果为柔性有机存储器领域的研究展开了新的方向。

We presented a facile method to prepare uniform size and stable property graphene quantum dots (GQDs) from chemical cutting the double-walled carbon nanotube with blue light emission in a chlorobenzene solution. The double-walled carbon nanotube was firstly cut into graphene nano sheets (GNSs) in acidic in the condition of heating and stirring, then chlorobenzene was used to separate GQDs from GNSs in water. The chlorobenzene solvent enabled the preparation of GQD-PVK hybrid nanocomposite. Nonvolatile rewritable memory effect was observed for the GQD-based nanocomposite, suggesting the promising applications of GQDs in data storage. Moreover, due to the easy solution process, we demonstrated the design and realization of flexible GQD-based memory device. The memory has performance as follow: low driving-voltage, high ON/OFF ratio, high cycles, high repeatability and stability. This work may expand the application of GQDs to the portable electronic devices.