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+.