Fig. 3. The in situ formation of Au&Ag NPs by using TA–PEG hydrogel as an reductant. (a) Photographs of TA–PEG hydrogel in treatment of AgNO3 (0.1 wt%); (b) photographs of TA–PEG hydrogel in treatment of HAuCl4 (0.01 wt%); (c) in situ formation of Ag NPs objected by UV-vis spectrum; (d) in situ formation of Au NPs objected by UV-vis spectrum; (e) schematic process for the Au or Ag NPs decorated TA–PEG hydrogel.
