Graphene-based materials have been extensively investigated as light converters for photothermal therapy, energy harvesting, and laser ignition owing to their good light absorption and high thermal conductivity. Further, the energy output of pure graphene materials as laser converters is relatively low. In this paper, we reported the introduction of ammonium nitrate (AN) into graphene oxide (GO) for the preparation of free-standing, graphene-based membranes using anti-solvent method and vacuum filtration. They showed good light absorption and energy output, leading to excellent photothermal performance owing to the synergistic reaction between GO and AN. The existence of AN was confirmed by scanning electron microscopy, X-ray diffraction, and energy-dispersive X-ray spectroscopy analyses. The influence of GO and NH₄NO₃ on the photothermal performance of the composite membranes was entirely investigated by ultraviolet, thermal gravimetric analysis, and differential scanning calorimetry analyses. The heat release and the maximum heat release rate of the G₂₀N₅ film were 1030 ​J·g⁻¹ and 8.9 ​J·g⁻¹s⁻¹, respectively, which were much higher than those of the pure GO. The flame produced by the laser irradiation was captured by a high-speed camera. The prepared G₂₀N₅ film showed the best performance among all the samples. Compared with pure GO (approximately 300 ​°C at 0.7 ​W), the temperature of the G₂₀N₅ composite film was dramatically increased (approximately 450 ​°C at 0.7 ​W) under the same power of the pulse laser irradiation, which is important for the potential application of optical ignition with low initiating energy.

石墨烯基材料因其良好的光吸收性和高导热性而被广泛研究用作光热疗法，能量收集和激光点火的光转换器。此外，纯石墨烯材料作为激光转换器的能量输出相对较低。在本文中，我们报道了将硝酸铵（AN）引入氧化石墨烯（GO）中，以使用抗溶剂法和真空过滤制备基于石墨烯的自立式膜。它们显示出良好的光吸收和能量输出，由于GO和AN之间的协同反应，因此具有出色的光热性能。通过扫描电子显微镜，X射线衍射和能量色散X射线光谱分析确认了AN的存在。GO和NH ₄的影响通过紫外，热重分析和差示扫描量热法分析了NO ₃对复合膜光热性能的影响。G ₂₀ N ₅薄膜的散热和最大散热率分别为1030 J·g ^-1和8.9 J·g ^-1 s ^-1，远高于纯GO。由激光照射产生的火焰被高速照相机捕获。所制备的G ₂₀ N ₅膜在所有样品中均表现出最佳性能。与纯GO（在0.7 W时约300°C）相比，G ₂₀ N ₅的温度 在脉冲激光辐照的相同功率下，复合膜急剧增加（0.7 W时约为450°C），这对于低激发能的光学点火的潜在应用至关重要。