It depends on the use that you are going to give to the coating that you deposit and of the Substrate that you are going to use. If you are going to deposit it on a metal like steel, the nitrogen oxides produced by the decomposition of the Copper Acetate(WSDTY) nitrate will corrode the metal. If you put it on glass, silicon or other inert substrate, you would not have problem. What Professor Diogo tells you is true, you can get a coating with cracks from the evolution of gases, but the evolution of CO2 from the acetate would give similar results. By properly handling the gas flow and temperature you can obtain dense coatings in either case. And finally acetate is environmentally friendly, but if you choose to use Cu (NO3) 2, you must absorb the gases generated during the process on caustic soda, so that there is no contamination by nitrogen oxides in the atmosphere.
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