▎ 摘　　要

Optical materials with dynamic colors have shown great prospects for applications in display devices, smart windows, and camouflage coatings. Recently, intercalation has been demonstrated to be a powerful strategy for tuning electromagnetic properties of two-dimensional materials ranging from visible to microwave wavelengths, such as the visible color, infrared emission, terahertz radiation, and optical second-harmonic generation. Here, a systematic study of graphene intercalation compound (GIC)-based coloration films is presented. Through lithium (Li), sulfuric acid (H2SO4), and ferric chloride (FeCl3) intercalation, the color of a multilayer graphene (MLG) film transforms from gray to yellow, blue, and dark, respectively. This is attributed to the reconstruction of the band structure of graphene after intercalation, resulting in a significant effect on its optical properties. Furthermore, tunable and reversible color changes of MLG film have been demonstrated by precisely controlling the Li-intercalation process. Our research indicates that intercalation is a versatile strategy for fabricating advanced coloration materials and provides a promising tunable optical surface for the application in sensing, adaptive camouflage, and smart displaying.