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Keywords:

  • surface charge;
  • photoluminescence;
  • cytotoxicity;
  • magnetism;
  • surface plasmon resonance
Thumbnail image of graphical abstract

A poly (acryl acid) (PAA) post-treatment method is performed to modify the surface charge of ZnO nanospheres, hematite nanocubes, and Ag nanoprisms from highly positive to very negative by adjusting the PAA concentration, to and greatly modify their photoluminescence, cytotoxicity, magnetism, and surface plasmon resonance. This method provides a general way to tune the nanoparticle properties for broad physicochemical and biological applications.