Facile and controllable synthesis of molybdenum disulfide quantum dots for highly sensitive and selective sensing of copper ions

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

(color online) (a) Emission spectra of MoS₂ QDs in the presence of Cu²⁺ with different concentrations in a range from to . (b) The plot of MoS₂ QDs with different concentrations of Cu²⁺. (c) PL emission spectra of MoS₂ QDs with Cu²⁺ under different PH values. (d) The relationship between the PH value and the fluorescence intensity.