使用扫描电子显微镜（SEM，JEOL-JSM-7500F，日本）对所有样品的表面形态进行了表征。图 1显示了SPCM 的形态。扫描电镜图像显示，片状可膨胀石墨转变为具有多孔结构的蠕虫状 （图 2-3）。多孔结构进一步提高吸附效率。与 PDMS 混合并固化后，SPCM 表面仍具有多孔结构，有助于光吸收。

The surface morphology of all samples was characterized using a scanning electron microscope (SEM, JEOL-JSM-7500F, Japan). The SEM images in Fig. 1 show the macroscopic morphology of SPCM. The SEM images show that the flake-shaped expandable graphite transforms to wormlike EG with porous structures (Fig. 2-3). The porous structures further improve the adsorption efficiency of EG. After mixing with the PDMS and curing, the SPCM surface still has a porous structure, which aids light absorption.