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Effect of chloroauric acid concentration
(a) Visual observation of reaction mixture after 2 h with different chloroauric acid concentrations (A) 0.5 mM, (B) 1 mM, (C) 1.5 mM, (D) 2 mM, (b) UV–vis absorption spectrum of AuNPs at various time intervals with different concentrations ((A) 0.5 mM, (B) 1 mM, (C) 1.5 mM, (D) 2 mM)
