How to prevent oxidation of copper nanoparticles synthesized from plant extract at room temp i.e how to dry the prepared sample at room temp?

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Yuri Mirgorod

Dear Humayun Akhter :

Copper is oxidised by reacting

2Cu + O2 = 2CuO

Standard Gibbs energy of the reaction is -129.7 kJ / mol. Therefore, copper is spontaneously oxidized by atmospheric oxygen. Large specific surface area of the nanoparticles. They can catch fire in the air! The water also dissolved oxygen. To the left of balance offset the inert gas is used. Any surface protection given in the examples, does not help. To attach a certificate file of copper nanoparticles. This data is a company that sells nanoparticles. It synthesizes them into an inert gas. Pay attention to storage. Nanoparticles containing 1.76% oxygen. Therefore, it contains 5% CuO.

Best regards.

Renukka Yaadav

I also tried making Copper Nanoparticles biologically, but ended up getting CuO nanoparticles. You can only avoid this by using an inert gas atmosphere.

I heated my sample at around 70-80 degree Celsius and obtained a black powder upon complete drying.

Dheeraj Kumar

I'm also working on Copper nanoparticles. what I got from my experiments is that we can get dry Copper nanoparticles if we use some proper capping agent. Suppose if we are using some capping agent which is not stable above 70 or 80 degree celsius temp like polymers and we need this temp to evaporate water. then we should use some surfactant capping because they are even stable at higher temperatures. I have successfully got Copper nanoparticles powder of green colour (size 2-7nm) by using some surfactant capping; one more thing I have synthesize Copper nanoparticles in Hexane which was evaporated automatically at room temperature. But can't reveal my experiment because of some confidential terms of that organisation I'm working in.

Easy Synthesis of Copper Nanoparticles by Leaf Extract,

http://www.instanano.com/nanomaterial-synthesis/metal-nanoparticles/synthesis-copper-nanoparticles-2/

Dear Mr. Dheeraj Kumar,

Nanoparticles of copper should be black or brown. No other evidence of the production of nanoparticles. Green, possibly from hydrated copper ions.