During green synthesis nanoparticles exhibits different colour with a characteristic SPR peak at different wave length.
I think you have different size through your sample. you can see this link please:
https://www.sigmaaldrich.com/materials-science/nanomaterials/gold-nanoparticles.html
Download the article s
Green chem..2008.,10, 859-862
Nano-Micro Letters.,2010., 2 (3), 169-176
Int. J Hydro Energy.,2010.,35, 4215-4221
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