Fig. 3
From: Production of monolayer-rich gold-decorated 2H–WS2 nanosheets by defect engineering
Microscopic characterization of the purified l-WS2–Au. a Wide view TEM image of purified l-WS2–Au1. Scale bar 100 nm. AuNPs with diameters of 2–20 nm are observed decorating nanosheet edges and terraces. b EDX spectrum acquired on the nanosheets in a showing signatures of W, S, Au. c Magnified TEM image of a representative nanosheet in the purified l-WS2–Au1 sample. Scale bar 20 nm. Inset: Fast Fourier Transform. d, e Wide view TEM image of the purified l-WS2–Au4.5 sample. Scale bar 50 nm d and 20 nm e Only very small Au nanoparticles (1.5–4 nm) are observed. f High-resolution TEM image confirming the high crystallinity of the samples. Scale bar 2 nm. g–j AFM of the purified l-WS2–Au4.5. g AFM topography image (scale bar 250 nm) of a WS2 nanosheet with the corresponding line profile (bottom). h Histogram of apparent nanosheet thickness. i Histogram of apparent nanosheet length showing a mean WS2 length of 140 nm. Inset: representative AFM image (scale bar 250 nm). j Plot of nanosheet length vs. AFM height. Each data point represents one individual nanosheet
