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. 2024 Feb 20;18(9):6927–6935. doi: 10.1021/acsnano.3c08606

Figure 3.

Figure 3

Point defect type exploration for 532 nm-laser-illuminated 2H-MoTe2 (LI 2H-MoTe2) ML. (a) Wide-view HAADF-STEM image of LI 2H-MoTe2 ML. Typical defects denoted by white dotted rectangles (i)–(iii) in (a) represent (i) VMo coupled with Moint, (ii) VTe1+1O, and (iii) VTe2+2O, respectively. (b) (Top panel) Enlarged HAADF-STEM micrographs in (a), revealing (i) VMo (dotted blue circle) and Moint (solid purple circle). (Bottom panel) Corresponding atomic model as top panel; VMo (Moint) with dotted blue circle (solid purple sphere). (c, d) (Top panels) Enlarged HAADF-STEM micrographs in (a) revealing (ii) VTe1+1O (dotted red circle) and (iii) VTe2+2O (dotted yellow circle), respectively. (Middle panels) Corresponding ABF-STEM as top panels illustrating enhanced atomic contrast attributed to oxygen adsorption at each VTe1 and VTe2 sites. (Bottom panels) Corresponding atomic configurations with oxygen atom (red sphere). Scale bars, 0.2 nm. (e) Intensity profiles for HAADF- (open gray squares) and ABF- (open yellow squares) regions extracted along the dotted diagonal yellow rectangles in the top and bottom panels in (d), respectively. Note that oxygen contrast is detectable only in ABF-STEM (yellow arrow).