While modifying the silver nanoparticles with L-methionine I could not get the absorptn peak shifted towards less wavelength, what can be the reason ?

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Yuri Mirgorod

L-methionine - Aliphatic amino acid. Its sigma electrons do not react with silver nanoparticles plasmons. Will shift with amino acids which contain an aromatic or heterocyclic group.

Best regards.

V. N. Ravi Kishore V.

What is the solution pH? Try changing solution pH.

Muhammad Imran Khattak

Start with lowest concentration,you might have optimized concentration of your capping agent.

Regard

Muhammad imran khattak