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Intercalation is an effective method to improve and modulate properties oftwo-dimensional materials. Even so, spatially controlled intercalation atatomic scale, which is important to introduce and modulated properties, has notbeen successful due to difficulties in controlling the diffusion ofintercalants. Here, we show formation of angstrom-wide conductive channels(~4.3 A) in black phosphorus by Cu intercalation. The atomic structure,resultant microstructural effects, intercalation mechanism, and localvariations of electronic properties modulated in black phosphorus by Cuintercalation were investigated extensively by transmission electron microscopyincluding in situ observation, DFT calculation, and conductive atomic forcemicroscopy.

Angstrom-wide conductive channels in black phosphorus by Cu intercalation