Tetrachloroauric acid trihydrate (HAuCl4 · 3H2O) was purchased from Sigma-Aldrich (Shanghai, China). Silver nitrate (AgNO3), ascorbic acid (AA), trisodium citrate, hydrochloric acid (HCl), fluorouracil (5-FU), cisplatin (CisPt), and camptothecin (CAMP) were purchased from Aladdin Chemistry Co. Ltd (Shanghai, China). Custom-made peptides such as nuclear localization signal (NLS, CGGGPKKKRKVGG) and cell penetrating peptide (RGD, RGDRGDRGDRGDPGC) were procured from Sangon Biotech (Shanghai, China). Thiol-modified methoxypolyethylene glycol (mPEG-SH, MW 5000) was obtained from Jenkem Technology Co. Ltd (Beijing, China).
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