What is optimum ratio of metal ions in precursor and reducing agent in preparation of metal nanoparticles?

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Yuri Mirgorod

Dear Muhammad:

The equilibrium constants in redox reactions of metal ion + reductant (hydrazine, borohydride) is very large. Therefore, the amount of reducing agent can take a little more of the stoichiometric. Weak reducing agents (rutin, glucose) necessary to take one and a half, twice. In addition, they act as stabilizers.

Regards.

Muhammad Imran Khattak

Thanks Mr.Yuri,for your answer,But why i don't get that particular absorption (lambda max.) that must come if my sample have metal nanoparticles ,(b/w 230-300 nm).while colour changes to pale blue to black after adding reducing agent borohydride.

I do not understand. What you are redusining the ions? What concentration? Plasmon resonance band in the visible spectrum. Write your problem in detail in the letter.

Respected Mr.Yuri

I have taken 0.2M of 100 ml Ni(II) ions solution,0.2M of 100ml solution of borohydride and I adds both in 1:4 respectively to reduce Ni(II) ions,on audding reducing agent colour changes pale blue to black means metal ions reduced or metal nanoparticles formed,but when I talked uv-visible spectrograph,I m not getting the particular wave length (absorption band) that is specific for Ni nanoparticles.what is the reason ? also suggest me the best mixing ratio of metal precursor solution and reducing agent to get best results.Dear Yuri guide me when you get free. Thanks

Sunil Kumar

I don't think only colour give you a information whether nano particle is formed or not, changing is colour shows only the reduction of Ni salt. May be the size of particle is large so LSPR is not come in the range of UV. I don't say that Ni is not formed but the size of particle is not in the range of nano meter. for LSPR the size of nano particle must be lower than 500nm.

Thanks Sunil Kumar .

Dear Sunil , wil you plz suggest me how Nickel nanoparticles can be prepared successfully in the nano ranges ? can you give me the scheme of concentration of both ,Ni salt solution and reducing agent along with optimum conditions that can yield the nanoparticles of size below 100 nm and I be able to get that particular LSPR.