I synthesized silver nanoparticles from plant extracts. In SEM analysis I found nanoparticles were agglomerated. How can I avoid agglomeration?
Very first step, disperse the nanoparticle in a good solvent.
Do sonication.
Use one drop of the nanoparticle solution and place it on a glass surface.
Evaporate the solvent by drying.
Check SEM.
thankyou so much.i dont want want to add any surfactant .i am using water as a solvent.i ll so sonication and try once.
try to add indifferent ions to the solution or try to increase the viscosity.
Adding surfactant is good method to avoid agglomeration in nanoparticles. If you don't want to add any surfactant, you can search for suitable plant extract. Some plant extracts acts as a reducing agent as well as capping agent. Other-hand, You can go for mild sonication, immediately do analysis (SEM, TEM), otherwise, nanoparticles easily agglomerate with time.
Dear Vaishnavi Srinivasan, what are the parameters you have got? mainly what is the zeta potential of you nanoparticles?
A surfactant may not work well with metal nanoparticles (perhaps with judcious choice as they are many different types?). A steric stabilizer such as starch will do it. One can still employ sonification at a later stage.
You change ratio of AgNO3 and plant extract. Do some initial optimization. Please check our paper:
"Potential Theranostics Application of Bio-Synthesized Silver Nanoparticles (4-in-1 System)."
I have the same problem . When can i do the step of sonication ?
after production and centrifugation or before centrifugation?
Dear Dina,
Sonication always not needed. But if you are really facing the problem, you can do sonication with the centrifuged pellets.
Mr, Sudip
If I do not use the Sonication what is the Alternative ? I do not want to use any chemical because it is bioreduction.
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