If anyone prepared before copper nanoparticles from copper chloride and ascorbic acid, I tried the method different times but always I get copper oxide, how to get rid of this or how to prevent its formation ? Is there any tried easy method to do that ?
Dear Heba:
The nanoparticles of copper are rapidly oxidized. It should be passed through the reaction mixture nitrogen or argon. A rough description of the synthesis.To 10 mL of 2M aqueous hydrazine solution containing 0.0006 M citric acid and 0.006 M CPC, was added 10 ml of 0.02 M CuCl2 solution containing 0.0006 M citric acid 0.006 M CPC, with vigorous stirring at room temperature. Throughout the experiment was passed through the reaction mixture nitrogen to avoid oxidation copper nanoparticles. The reaction takes place for 2.5 hours. Prepared in 20 ml dark-red dispersion.
Миргород, Ю. А.; Борщ, Н. А.; Бородина, В. Г.; Юрков, Г. Ю. Получение и характеризация хлопчатобумажной ткани, модифицированной наночастицами меди. // Химическая промышленность. - 2012. - Т. 89, № 6. - С. 310-316.
Regards.
Hi Heba,
Indeed, one has to be careful to provide inert gas medium in order to prevent oxide formation.
Following articles will give you an overview about various methods to synthesize copper NPs.
http://link.springer.com/article/10.1007%2Fs11814-014-0127-y
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-70762014000300197
Does this inert gas medium is costly as it is not available for me, or is there any alternative solutions ?
Using an inert gas medium would be very difficult for me too.
Is the copper oxide just a thin layer which could be dissolved by e.g. HCl or NaOH, or will the particles be copper oxide right through?
The method seems to work okay - producing dark brown nanoparticles - in this video (which desperately needs editing down!):
https://www.youtube.com/watch?v=yPQDGP0h5dA&t=384s
My guess is that keeping the solution boiling throughout deoxygenates the copper chloride solution sufficiently? Boiling is not as effective at deoxygenating as using nitrogen (unless done at reduced pressure), but maybe it's enough?
I‘d suggest you to filter the nanoparticles and keep them slightly wet in an 0.1%-1% solution of ascorbic acid this will keep them reduced and stable in oxidizing environmen. If you need them dry I‘d suggest directly vacuum drying the Cu np with excess of ascorbic acid and storing them in a very small, airtight container
i need your help. Kindly guide me which method you use to get copper oxide?
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