针对光热转换材料能量利用率低、结构稳定性差的问题,在石墨烯薄膜的基础上借助微压印技术构筑紧密排列的纳米管阵列上层,并采用定点滴加-多次发泡的方式成型多孔气凝胶底座,进而制得吸光上层与隔热底座结构一体化的石墨烯基光热转换材料。研究结果表明,由石墨烯空心纳米管构建的光陷阱可以显著提高光线反射次数、降低光反射率,且纳米管长度与材料光吸收能力成正比,可以在85kN及8h的压印条件下将吸光率提高至98%以上。同时,结合多孔气凝胶隔热底座可以有效改善材料的光热转换行为及其水蒸发效果,并在底座厚度6mm时达到87%的光热转化效率及1.3kg/(m2·h)的水蒸发速率。
In order to solve the problems of low energy utilization rate and poor structural stability of photothermal conversion materials,a tightly arranged upper layer of nanotube array was constructed on the basis of graphene film by means of micro imprinting technology.Meanwhile,a porous aerogel base was formed by fixed-point dropping and multiple foaming.Thus,a graphene-based photothermal conversion material with integrated structure of light absorbing upper layer and heat insulating base was prepared.The results indicated that the light trap constructed from graphene hollow nanotubes could not only significantly increase the number of light reflections,but also reduce the light reflectivity.The length of the nanotubes was directly proportional to the light absorption ability of the material,which could increase the absorbance to over 98% under the imprinting conditions of 85kN and 8h.Besides,the combination of porous insulation base could effectively improve the photothermal conversion behavior and water evaporation effect of the material,and achieve 87% photothermal conversion efficiency and 1.3kg/(m2·h) water evaporation rate at the base thickness of 6mm.
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基金资助
中央高校基本科研业务费专项资金(30923011018);中国博士后科学基金(2021M691580)
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