Try with the electrochemical deposition process under potentiostatic control. It enables an optimal control of parameters which affect the amount and size of deposited Ag particles, such as the applied potential and the time of deposition.
The easiest procedure is to use a reducing agent in aqueous solution. Do you have NaBH4 or ascorbic acid at hand? You also need citrate for stabilization.
We are preparing Ag nano-particles after using the microbial protein of Aspergillus terreus CZR1 and consistently getting average nano-particle size of 2.5 nm. For more details please look at the publication of Raliya and Tarafdar (2012), Journal of Bionanoscience.
Concerning chemical bath deposition of silver, you can use glucose as reducing agent. The silver plating bath formulation is as follows:
AgNO3 (source of Ag+)
NH4OH as complexing agent
NaOH
Glucose as reducing agent (source of electrons)
Take a look at:
September 2nd, 2015 Silver colloids and invisible ink
https://www.brainshark.com/malvern/vu?pi=560497681&b=1&tx=120486&c1=22
The silver diammine complex is often used as the precursor for reduction with a possible variety of reducing and stabilizing agents. Personally I do not favor borohydride reduction as this incorporates B into the Ag. Remember that Ag+ is formed on the surface (top 5 - 10 atomic layers) in the presence of air or moisture - not Ag metal..
Dear Manas,
It is so simple take 250 ml distill water and dissolve 0.0424 mg AgNO3, Which is 1mM. Then for optimization you need to check different concentration of AgNO3 with the constant ratio of Plant extract. Further UV_Vis Spectroscopy will conform the synthesized Silver NPs in the peak rang of 420-480. But remember, this procedure is called green syntheis.
Thank you
Dear Manas
As mentioned above many methods can be used for the preparation of Ag NPs but each method gives Ag NPs with sizes different from the others. If the size is not important for you and you just want to have Ag NPs with less than 100 nm, then use the reducing method of AgNO3 with glucose in alkaline solution in the presence of PVP as stabilizing agent.
Dear Manas,
In order to attain nanosized silver particles (∼10nm) by electroless plating method, deposition parameters should be closely controlled; e.g., the pH value of the plating solution, the temperature and the concentration of the solution constituents.
- Badges
- Science topic
- Similar topics
- Chemistry
- Nanotechnology
- Nano