Fig. 6.

(a) The preparation of RGD-QD-MoS₂ NSs. (b) Ultravioletvisible-near infrared (UV–Vis–NIR) absorption spectra of MoS₂ NSs, BPM NSs, and RGD-QD-MoS₂ NSs. (c) Normalized photoluminescence spectra of RGD-QD-MoS₂ NSs. (d) Fluorescence images of HeLa tumor-bearing Balb/c nude mice at different times after i. v. injection of RGD-QD₆₅₅-MoS₂ NSs. Reprinted with permission from Ref. [139]. Copyright 2017, Nanoscale. (e) The multiphoton luminescence image of HeLa and HaCaT cells with internalized MoS₂ QDs. Excitation wavelength was 700 nm and detection wavelength in the 420–460 nm range. Reprinted with permission from Ref. [140] Copyright 2015, Small. (f) TPL intensity of the MoS₂ QDs at 1064 nm excitation. (g) Variation in the TPL intensity with time, indicating that anti-PSMA antibody-attached MoS₂ QDs exhibit very good photostability. For this experiment, we used a laser power density of 40 W/cm². Reprinted with permission from Ref. [141] Copyright 2017, ACS omega.