Optical ignition of solid energetic materials, which can rapidly release heat, gas, and thrust, is still challenging due to the limited light absorption and high ignition energy of typical energetic materials (e.g., aluminum, Al). Here, we demonstrated that the optical ignition and combustion properties of micron-sized Al particles were greatly enhanced by adding only 20 wt % of graphene oxide (GO). These enhancements are attributed to the optically activated disproportionation and oxidation reactions of GO, which release heat to initiate the oxidization of Al by air and generate gaseous products to reduce the agglomeration of the composites and promote the pressure rise during combustion. More importantly, compared to conventional additives such as metal oxides nanoparticles (e.g., WO₃ and Bi₂O₃), GO has much lower density and therefore could improve energetic properties without sacrificing Al content. The results from Xe flash ignition and laser-based excitation experiments demonstrate that GO is an efficient additive to improve the energetic performance of micron-sized Al particles, enabling micron-sized Al to be ignited by optical activation and promoting the combustion of Al in air.

中文翻译：

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光学活化的铝/氧化石墨复合材料的能量性能

由于典型的高能材料（例如，铝，Al）的光吸收有限和高点燃能，因此可以快速释放热量，气体和推力的固体高能材料的光学点火仍然具有挑战性。在这里，我们证明了通过仅添加20 wt％的氧化石墨烯（GO），可以极大地提高微米级Al颗粒的光学点火和燃烧性能。这些增强归因于GO的光学活化歧化和氧化反应，它们释放热量以引发空气对Al的氧化作用，并生成气态产物以减少复合材料的团聚并促进燃烧过程中的压力上升。更重要的是，与常规添加剂相比，例如金属氧化物纳米颗粒（例如，WO ₃和Bi ₂ O ₃），GO具有低得多的密度，因此可以在不牺牲Al含量的情况下提高能量性能。Xe闪光点火和基于激光的激发实验的结果表明，GO是一种有效的添加剂，可改善微米级Al颗粒的能量性能，使微米级Al通过光学活化而点燃，并促进Al在空气中的燃烧。