[Retracted] Fluorescent Carbon Dot-Supported Imaging-Based Biomedicine: A Comprehensive Review

Figure 5

Fluorescence imaging-supported sensing of other effects (pH, thermal, polarity). (a) Response mechanism to pH of RhB-AB-CDs based on the inner filter effect of Aniline Blue on the emission of Rhodamine B and fluorescence color changes of CLSM images of RhB-AB-CDs-treated Pholiota adipose mycelia at pH of (5.5 to 7.5). Adapted with permission from Ref. [172]. (b) (A) Fluorescence linear relationship CDs during heating and cooling processes. (B) Thermal stability of FL lifetimes over seven cycles of heating and cooling between (30 and 70) °C ((I)₀ and (I) are the FL intensity at 20°C and other temperatures, respectively). (C) CLSM images of CDs-treated 293T cells at (20, 30, and 40)°C; Em was collected at (415–550) nm at an excitation wavelength of 405 nm. Adapted with permission from Ref. [174]. (c) Intracellular polarity sensor through FL images of HepG2 cells incubated with (A) DMSO + CDs (obvious FL enhancement), (B) CDs, and (C) HBSS + CDs (quenching FL) at Ex/Em of 488/(550–650) nm. Adapted with permission from Ref. [173].