Label-free tungsten disulfide quantum dots as a fluorescent sensing platform for highly efficient detection of copper (II) ions |
(color online) (a) TEM image of WS2 QDs. (b) Size distribution histogram of pure WS2 QDs. (c) TEM image of WS2 QDs with 200-μM Cu2+. (d) Size distribution histogram of WS2 QDs with 200-μMCu2+. |