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) PL emission (red line) and absorption spectra (blue line) of MoS₂ QDs (inset: MoS₂ QDs are exposed under natural light and 365 nm UV light, respectively). (b) Normalized PL emission spectra of the MoS₂ QDs obtained under excitations of 320400 nm. (c) PL emission spectra of the MoS₂ QDs with different hydro-thermal synthesis time under 360 nm excitation. (d) Absorption spectra of the MoS₂ QDs with different hydro-thermal synthesis time under 360 nm excitation.