Fig. 1

The reaction mixture’s color, consisting of potassium tellurite, Folic acid solution, and sodium borohydride, was observed before (a) and after (b) being heated in a microwave oven. The UV-Vis absorption spectra for (c) Te NPs, (d) FA@Te NPs, (e) Folic acid solution, and (f) potassium tellurite solution.