Fig. 1. Mechanism diagram of MoTe₂ quantum dots prepared by liquid phase exfoliation method

Fig. 2. TEM images of MoTe₂ quantum dots prepared by six solvents. (a) NVP; (b) NMP; (c) Acetone; (d) DMF; (e) IPA; (f) Ethanol

Fig. 3. FTIR spectra and XRD patterns of MoTe₂ quantum dots prepared by six solvents: (a) FTIR spectra of MoTe₂ quantum dots prepared by NVP, acetone and IPA (from top to bottom); (b) FTIR spectra of MoTe₂ quantum dots prepared by NMP, DMF and ethanol (from top to bottom); (c) XRD patterns of MoTe₂ quantum dots about solvent prepared by NVP, NMP, acetone, DMF, IPA and ethanol (from top to bottom)

Fig. 4. Phase structure analysis of MoTe₂ quantum dots prepared by NVP: (a)-(c) XPS spectra of quantum dots prepared by NVP; (d) The lattice fringes of quantum dots prepared by NVP; (e) EDS spectrum of quantum dots prepared by NVP; (f) The crystal planes (0 0 4) and (1 0 7) of MoTe₂

Fig. 5. Optical characterization of MoTe₂ quantum dots prepared by NVP: (a) UV-Vis-NIR absorption spectrum of quantum dots prepared by NVP; (b) The calculated band gap of NVP-prepared MoTe₂ quantum dots; (c) PL spectra of NVP-prepared MoTe₂ quantum dots solution

Fig. 6. Comparison of six solvents on the exfoliation effect of MoTe₂ quantum dots: (a) UV-Vis-NIR absorption spectra of MoTe₂ samples in six solvents (from top to bottom, NVP, NMP, acetone, DMF, IPA, ethanol); (b) The 3D schematic of Hansen parameters; (c) The picture of the supernatant obtained by exfoliation with different solvents; (d) The relationship between the concentration of quantum dots solution and turbidity