State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai 200240, P.R. China.
Nanoscale. 2018 Apr 5;10(14):6306-6312. doi: 10.1039/c7nr09556b.
Sheet-like graphene tends to stack with each other in thin films, resulting in relatively smooth microstructures with increased reflection as the thickness increases. In contrast, when the sheets are crumpled into a shape like paper balls, reflection is greatly reduced. In this work, crumpled graphene balls are found to be strong light absorbers in the visible and near-infrared regions. Average absorption of thin films made of crumpled graphene balls can reach up to 97.4% in the wavelength region of 350-2500 nm. When crumpled graphene balls are used as the solar absorber for the interfacial evaporation system, an evaporation efficiency of 84.6% was obtained under one sun at ambient pressure. Enhanced solar absorption of crumpled graphene balls, coupled with their aggregation-resistance and universal solution processability, makes them promising candidates for solar heating/distillation applications.
片状石墨烯在薄膜中容易相互堆叠，导致随着厚度的增加，微观结构变得相对光滑，反射率增加。相比之下，当薄片被皱成纸球形状时，反射率会大大降低。在这项工作中，发现皱缩的石墨烯球在可见光和近红外区域是强光吸收体。由皱缩的石墨烯球制成的薄膜在 350-2500nm 的波长范围内的平均吸收率可达 97.4%。当皱缩的石墨烯球用作界面蒸发系统的太阳能吸收器时，在环境压力下，在一个太阳的照射下获得了 84.6%的蒸发效率。皱缩的石墨烯球增强的太阳能吸收能力，加上其抗团聚性和普遍的溶液加工性能，使它们成为太阳能加热/蒸馏应用的有前途的候选材料。
