Interface Control Research Center, Future Convergence Research Division, Korea Institute of Science and Technology , Seoul, Korea.
ACS Nano. 2014 May 27;8(5):4248-56. doi: 10.1021/nn4050968. Epub 2014 Apr 15.
We have demonstrated the preparation of white-emissive conjugated polymer nanoparticles wrapped with graphene oxide (GO) nanosheets. Highly stable, GO-wrapped, poly(9,9-di-n-octylfluorenyl-2,7-diyl) nanoparticles (GO-PFO NPs) with diameters in the range 30-150 nm were successfully obtained by utilizing the GO nanosheets as an interface stabilizer in an emulsification process. The synthesized GO-PFO NPs exhibited unique white-emitting photoluminescence with a characteristic green-emissive broad band above 500 nm, which was distinct from the photoluminescent behavior of PFO NPs without GO. This green emission was deduced to originate from the presence of the GO nanosheet shell surrounding the PFO NPs, rather than from luminescence of GO itself or formation of keto defects in the PFO chain. PL decay analysis showed that the GO-wrapped PFO NPs had a longer luminescence lifetime in comparison to PFO NPs without GO, and highly efficient energy transfer to lower energy state induced by the GO occurred.
我们已经制备了用氧化石墨烯（GO）纳米片包裹的发白射共轭聚合物纳米粒子。通过在乳化过程中利用 GO 纳米片作为界面稳定剂，成功获得了直径在 30-150nm 范围内的高度稳定的 GO 包裹的聚（9,9-二正辛基芴-2,7-二基）纳米粒子（GO-PFO NPs）。合成的 GO-PFO NPs 表现出独特的发白射光致发光，具有特征性的 500nm 以上的宽绿光发射带，这与没有 GO 的 PFO NPs 的光致发光行为不同。这种绿光发射归因于围绕 PFO NPs 的 GO 纳米片壳的存在，而不是来自 GO 本身的发光或 PFO 链中酮缺陷的形成。PL 衰减分析表明，与没有 GO 的 PFO NPs 相比，GO 包裹的 PFO NPs 具有更长的发光寿命，并且 GO 发生了高效的能量转移到较低能态。
