965 µL of the as-prepared triangular Ag nanoplates solution, 20 µL of H_2 O_2 solution
within a range of 50 nM-1 µM are added sequentially into a 1.5 mL
tube. The reaction mixture is then incubated at 40 ◦C for 40 min, and
the absorption spectra in the range of 300–800 nm are recorded