Fig. 4: Atomic characterizations of structural defects in the recovered 2D diamond.
From: Experimental demonstration and transformation mechanism of quenchable two-dimensional diamond
a A low-magnification TEM image of ultrathin diamond. b High-magnification TEM image of the area selected from black solid box in (a). The twin boundaries (TBs) (yellow dotted lines), stacking faults (SFs) (arrowheads) and Σ3(\(211\)) TBs (pale green arrows) are well marked. c High-magnification TEM image of the area selected from dotted box in (a). HRTEM images of CD crystalline structures along [\(01\bar{1}\)] (d), [\(0\bar{1}1\)] (e) zone axes and TB (f, highlighted with yellow double arrow) from the regions marked in (c). The insets show the corresponding fast Fourier transform (FFT) results. g TEM image of diamond polytype coherently embedded in CD domains with TBs and SF. h Magnified TEM image from the violet-boxed region in (g). The FFT patterns of diamond polytype and CD are shown in insets as well. i The identified interfacial structure between graphene and 2D diamond. The 2D diamond samples for atomic characterization were prepared with hundred-nanometer scale thickness.
