Effect of pH and Irradiation Power in the Synthesis of Gold Nanoparticles by using Binahong (Anredera cordifolia) Leaves Extract

Abstract

Au nano particles have been successfully synthesized using extract of binahong (Anredera cordifolia) leaves at various pH, irradiation power and irradiation time. The synthesis was conducted using microwave oven for some minutes, at certain adjusted experimental condition. pH of solution was varied from 2 – 10, irradiation power was adjusted in the range of 30% - 100% of total power of 800W, and iiradiation time was studied in the range of 30 – 120 second. The experimental results showed at low pH, the nonspherical particle was more commonly formed. The stabilization of particles took place more effectively at the higher pH. At low pH, the nano particles were below 50 nm in size and were in form of triangle, rod, rhombic, cubic, or truncated form of these shapes. UV-Vis spectra also indicated that both microwave irradiation power and time significantly affect the morphology of particles. These research provide clear explanation about the effect of the pH and irradiation time over the AuNP synthesis by using greener method, which can be further studied in optimizing experimental parameters for conducting industrial scale synthesis.