Solid Intercalation and Exfoliation of Cl-Terminated Multilayered MXenes toward O-Functionalized Single Layers

). Such unique solid intercalation significantly expands multilayered MXenes in 30 min with an enhancement of interlayer spacing from 11.2 to 12.7 Å, facilitating their easy exfoliation to single layers. The resultant O-functionalized MXenes have a highly expanded structure and elevated permittivity, achieving a reflection loss value of -50.5 dB at a thickness of 1.35 mm for electromagnetic wave absorption.