State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Key Laboratory of Special Function Materials and Structure Design (MOE), Lanzhou University, Lanzhou 730000, P. R. China.
Nanoscale. 2015 May 28;7(20):9268-74. doi: 10.1039/c5nr01088h. Epub 2015 May 5.
Graphene-based materials have shown promising nonlinear optical properties in the visible range. To extend their nonlinear optical response to the near infrared (NIR) region, we prepared a new nanohybrid consisting of uniform PbS quantum dots (QDs) attached on the reduced graphene oxide, named rGO-PbS, via a facile, low-cost, and phosphine-free method. The rGO-PbS nanohybrid exhibited superior optical limiting properties to either graphene oxide or PbS QDs upon both 532 nm and 1064 nm excitation in the nanosecond laser pulse regime, which is attributed to the synergetic effects stemming from charge transfer between the two components. Meanwhile, the thin films containing the rGO-PbS nanohybrid dispersed in polymethylmethacrylate (PMMA) also showed excellent optical limiting properties with high transparency, implying the potential applications of this hybrid material in broadband nonlinear optical devices.
基于石墨烯的材料在可见光范围内表现出了有前景的非线性光学特性。为了将它们的非线性光学响应扩展到近红外（NIR）区域，我们通过一种简单、低成本且无膦的方法制备了一种由均匀的 PbS 量子点（QDs）附着在还原氧化石墨烯上的新型纳米杂化材料，命名为 rGO-PbS。在纳秒激光脉冲实验条件下，rGO-PbS 纳米杂化材料在 532nm 和 1064nm 激发下均表现出优于氧化石墨烯或 PbS QDs 的光限幅性能，这归因于两个组件之间的电荷转移产生的协同效应。同时，含有分散在聚甲基丙烯酸甲酯（PMMA）中的 rGO-PbS 纳米杂化材料的薄膜也表现出优异的光限幅性能，同时具有高透明度，这意味着这种混合材料在宽带非线性光学器件中有潜在的应用。
