Resumen:
In this work we report the synthesis of photoluminescent carbon-coated copper nanoparticles (Cu@C-NPs)
based colloidal suspensions, using the laser ablation of solids in liquids technique (LASL). LASL experiments
were carried out by ablating a Cu solid target immersed in acetone as the liquid medium with ns-laser pulses
(1064 nm) of a Nd-YAG laser. In all experiments the per pulse laser fluence and the repetition rate frequency
were kept constant and the ablation time was varied. The as obtained Cu@C-NPs suspensions were optically
characterized with absorption and photoluminescence spectroscopies. Raman spectroscopy was used to give
evidence of the carbon shell deposited around the Cu NPs. TEM results showed that 10 nm spheroids Cu@CNPs
were obtained. The as obtained Cu@C-NPs suspensions displayed out a PL emission band similar to that
for carbon nanoparticles suspensions obtained by the same technique. We have found that the blue-green PL
emission band intensity is mainly dependent on the ablation and aging time of the samples. The Cu@C-NPsbased
colloidal suspensions can be proposed as multifunctional due to its absorbance and emission properties.