In the present investigation, the effect of ascorbic acid volume in the synthesis of
copper nanoparticles (Cu NPs) mediated by chemical route and their stability over time was
evaluated. For the synthesis, copper sulfate pentahydrate CuSO4 (5H2O) was used as a
precursor agent and ascorbic acid (AA) as a reducing agent. Cu NPs was characterized by the
following techniques: UV-Visible spectrophotometry to evaluate structural changes that are
evidenced in the absorbance peak and atomic absorption spectrophotometry to define
nanoparticulate concentrations material in the precipitated and supernatant phases generated.
On the methodology it was possible to observe a controlled formation based on the increase in
the volume of ascorbic acid in the presence of sodium hydroxide, noticing a production of Cu
nanostructures with a tendency to oxidation over time. The UV-visible results showed
characteristic surface plasmon resonance peaks of metallic copper for the colloid containing
1.2 mL of A.A; as well as a specific copper concentration of 0.14 ppm in the supernatant and
1519.1 ppm in the precipitate. It is also evidenced that the solution exhibits a rapid reaction on
exposure to air by shifting the absorbance peak to 386 nm. In addition, it does not present
notable photosensitivity with respect to exposure to sunlight