2.3. UV–visible spectroscopic characterization of AgNPs
The synthesis of AgNPs and the effect of variation of pH from 4 to 9 on the
formation of AgNPs were studied using PerkinElmer Lamda 35 UV–visible spectrophotometer.
The pH was varied by the addition of 0.1 M sulfuric acid in the acidic
region and 0.1 M sodium hydroxide solution in the basic region. For the analysis,
0.3 ml of AgNPs was taken in a cuvette and diluted by 2 ml of distilled water.