All the chemicals and reagents were purchased from chemical sources, and the solvents for chemical reactions were distilled before use. All air and moisture sensitive reactions were carried out in flame-dried glassware under a nitrogen atmosphere. Pluronic® F-127 was bought from Sigma-Aldrich. ICG was bought from TCI. Cell Counting Kit-8 (CCK-8) was purchased from DoJindo. Dulbecco's modified Eagle's medium (DMEM), Fetal bovine serum (FBS), penicillinstreptomycin, phosphate-buffered saline (PBS), and trypsin were obtained from ThermoFisher.