Fig. 2: Optical characterization of Ni3N nanosheets.

a UV-DRS spectrum, b EELS spectrum of Ni3N nanosheets, c EELS plasmonic mapping of Ni3N nanosheets for different electron energy losses, d Emission enhancement of the methylene blue (MB) (1.25 mM) in the presence of the Ni3N nanosheets dispersion (0.5 mg mL−1 Ni3N in water) upon 630 nm excitation; e Photoluminescence of Ni3N nanosheets dispersion upon 630 nm excitation.