Label-free tungsten disulfide quantum dots as a fluorescent sensing platform for highly efficient detection of copper (II) ions

Zhao Xuan, He Da-Wei^†, Wang Yong-Sheng^‡, Hu Yin, Fu Chen, Li Xue

(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⁺.