SERS Study on the Interaction of Dithizone with Silver Substrates

From the UV-vis spectra of dithizone, we learn that dithizone is affected by concentration dependencies and solvatochromism that move UV-vis spectra of dithizone to lower wavelength. Dithizone is believed a free molecular below 10~(-5)mol/L. SERS, a Raman spectrum whose intensity exceeds by a factor of 10~4-10~6 than its normal spectrum is observed, is a good means to detect Dithizone. Using silver colloids as substrates, We investigate the interaction of dithizone with silver substrates and give our own explain: we learn that dithizone bonds silver through S and N.