Figure displays Au4f doublet with Au4f 7/2 peak centered at 84 eV, characteristic of gold in the metallic state . The ratio of the peaks Au4f 7/2 and Au4f 5/2 is 4:3 which testifies that there are no other gold oxidation states. Other detected species probably due to surface minor contamination are carbonates (see Figure ) and Teflon from the magnetic bar stirrer (see Figure ). All C1s regions invariably show the presence of the acidic group COOH, which is related to diazonium salts AB grafted on gold nanoparticles. In this regard, at the concentrations of 10 -4 and 510 -5 M of two salts such as grafting with single salts show a decrease trend for the ratio of C/Au by decreasing the concentration of diazonium salts; and thus, the number of aryl groups attached to the NP surface.