Extended Data Fig. 6: EELS line scan across the interface between ND and DMG.

(a) Typical High-resolution HAADF image of ND/DMG composite. The deepskyblue dashed line represents the pathway of EELS line scan, and the yellow rectangle represents the interface between ND and DMG. (b) EELS along the blue dashed line in a. The spectra collected at domains of DMG, ND/DMG interface and ND were marked by black, blue and red color. There is an intensity decrease of π* peak from DMG (black spectra) to ND (red spectra), and the intensity of π* peak at the interface (green spectrum) is between those at DMG and ND.