Random
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Conductive silver ink
http://www.youtube.com/watch?v=EBlqPS8boLI
Here is a NurdRage video which describes how to make silver ink that is conductive.
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1g of silver acetate is completely dissolved in 2.5mL of ammonium hydroxide (30%). 0.2mL of formic acid is added dropwise with stirring. Solution is
then capped and allowed to stand for 12 hours. The solution is decanted and then pushed through a 0.2 micrometer pore syringe filter. Draw it onto a
surface and let it dry. Then heat it to 90 celsius to sinter it into solid silver.
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Now, it sounds pretty easy to make, but I suppose formic acid is used for reduction. Now I don't have formic acid even in so small amounts, so would
something other work? Like ascorbic acid? Or H2SO3?
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Hexavalent
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Yes, in theory (to the ascorbic). I've used it to prepare ultrafine copper powder previously, so I'm sure something similar could be employed here.
Perhaps even glucose could be used, making the reaction similar to the classic "silver mirror".
Secondly, formic acid solutions can be obtained pretty widely as "Limescale Remover", and, at least here in the UK, it is quite inexpensive.
[Edited on 19-1-2013 by Hexavalent]
"Success is going from failure to failure without loss of enthusiasm." Winston Churchill
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blogfast25
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Quote: Originally posted by Hexavalent  |
Secondly, formic acid solutions can be obtained pretty widely as "Limescale Remover", and, at least here in the UK, it is quite inexpensive.
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Very true but some are acetic acid and I've found lactic acid in some of them too. If it's not labeled, the smell should be a dead give-away!
[Edited on 19-1-2013 by blogfast25]
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bfesser
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There's a company called Chemtronics that makes <a href="http://www.chemtronics.com/products/product.asp?id=7" target="_blank">pens</a>
for drawing conductive circuit traces. I searched for the MSDS and found that they have one using <a
href="http://www.chemtronics.com/products/americas/MSDS/4001.pdf" target="_blank">Ag</a> and one using <a
href="http://www.chemtronics.com/products/americas/MSDS/CW2000%20UK%202011%2012%2020.pdf" target="_blank">Ni</a>. With this info, it
shouldn't be too hard to reproduce the ink. I have Ag powder produced by reducing AgNO<sub>3</sub> with ascorbic acid—maybe
it's suitable?
The Ag pen ink MSDS practically reads like a recipe:
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Chemical Name—CAS No.—Wt. % Range
Silver—7440-22-4—35.0-65.0
Propylene Glycol Methyl Ether Acetate—108-65-6—2.0-20.0
Ethylene Glycol Monobutyl Ether Acetate—112-07-2—2.0-20.0
n-Butyl Acetate—123-86-4—5.0-35.0
Acrylic Resin—mixture—15.0-40.0
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Random
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| Quote: Originally posted by bfesser | There's a company called Chemtronics that makes <a href="http://www.chemtronics.com/products/product.asp?id=7" target="_blank">pens</a>
for drawing conductive circuit traces. I searched for the MSDS and found that they have one using <a
href="http://www.chemtronics.com/products/americas/MSDS/4001.pdf" target="_blank">Ag</a> and one using <a
href="http://www.chemtronics.com/products/americas/MSDS/CW2000%20UK%202011%2012%2020.pdf" target="_blank">Ni</a>. With this info, it
shouldn't be too hard to reproduce the ink. I have Ag powder produced by reducing AgNO<sub>3</sub> with ascorbic acid—maybe
it's suitable?
The Ag pen ink MSDS practically reads like a recipe:
| Quote: |
Chemical Name—CAS No.—Wt. % Range
Silver—7440-22-4—35.0-65.0
Propylene Glycol Methyl Ether Acetate—108-65-6—2.0-20.0
Ethylene Glycol Monobutyl Ether Acetate—112-07-2—2.0-20.0
n-Butyl Acetate—123-86-4—5.0-35.0
Acrylic Resin—mixture—15.0-40.0
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I have researched on this subject too, except I have found those materials hard to obtain. It's definitelly more useful though, since you can put it
more easily on the paper surfaces to make simple circuit boards.
I have also found a similar, yet a little bit different recipe, which works the same if I'm correct.
http://www.youtube.com/watch?v=dfNByi-rrO4
check 1:35 for alternative room temp recipe
Too bad, again, I can't obtain some of these materials. If I'll be able to synthesize them from OTC chemicals, I'll sure attempt it.
| Quote: Originally posted by Hexavalent | Yes, in theory (to the ascorbic). I've used it to prepare ultrafine copper powder previously, so I'm sure something similar could be employed here.
Perhaps even glucose could be used, making the reaction similar to the classic "silver mirror".
Secondly, formic acid solutions can be obtained pretty widely as "Limescale Remover", and, at least here in the UK, it is quite inexpensive.
[Edited on 19-1-2013 by Hexavalent] |
Interesting, I will definitelly try making small amounts and test those reductants.. I am from eastern europe so only OTC acids are HCl, H2SO3 and
phosphoric for rust removal. Haven't found any formic acid. There is actually one route:
ethylene glycol ---copper---> oxalic + glycerol ---> formic
but it seems like a mess especially since I don't have glassware for distillation
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Fleaker
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We do this with sodium formate at 65*C and pH 4 on 300 g/L silver nitrate. It is very selective for silver, ignoring copper. Nickel in high
concentrations will co-reduce.
There is a wide variability in growing fine particles. The more rapidly you form it, the finer they will be. Slow addition of reagent allows for the
formation of a heavier sand/sponge.
Neither flask nor beaker.
"Kid, you don't even know just what you don't know. "
--The Dark Lord Sauron
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Poppy
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I made a pretty colloid of silver suspension once, I think I had silver nitrate, formaldehyde and NaOH 1M solution and just mixed them all and voilá,
a silvery putty of very fine silver, it was transparent and probably would coalesce for some reason but I was scared and threw that off lol
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Random
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Yeah you see guys, I have some formaldehyde, maybe I could use it here.
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