▎ 摘　　要

Using graphene as a tunable optical material enablesa series ofoptical devices such as switchable radar absorbers, variable infraredemissivity surfaces, or visible electrochromic devices. These devicesrely on controlling the charge density on graphene with electrostaticgating or intercalation. In this paper, we studied the effect of ionicliquid intercalation on the long-term performance of optoelectronicdevices operating within a broad infrared wavelength range. Our spectroscopicand thermal characterization results reveal the key limiting factorsfor the intercalation process and the performance of the infrareddevices, such as the electrolyte ion-size asymmetry and charge distributionscheme and the effects of oxygen. Our results provide insight forthe limiting mechanism for graphene applications in infrared thermalmanagement and tunable heat signature control.