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UV-Vis spectra of Ag/Ni bimetallic nanoparticles prepared by reducing (a) 0.5 mM, (b) 1.0 mM, (c) 2.0 mM, and (d) 3.0 mM solutions using the extract of C. indica leaves at 70°C. The blue curve represents surface plasmon resonance after 30 minutes.
