D.O. Oseguera-Galindo, A. Martínez Benítez, A. Chávez-Chávez,
G. Gómez Rosas, A. Pérez-Centeno, M.A. Santana-Aranda
Departamento de Física, CUCEI, Universidad de Guadalajara.
Blvd. M. García Barragán 1421, Guadalajara, Jal. 44430, México
Silver nanoparticles were obtained by laser ablation of a silver target immersed in water. For this purpose, we employed the emission of a pulsed Nd:YAG laser at 532 nm, with an energy of 0.5 J/pulse, a pulse duration of 5 ns, a repetition rate of 10 Hz and a spot diameter of 1 mm. We used a XY driving mechanism which allows scanning laser irradiation on target’s surface with different speeds. Combining scanning speed and repetition rate of the laser, we could control the scanning density to 2500, 5000, 7500 and 10000 pulses/cm2. This involves the overlapping of a number of consecutive pulses, which increases with scanning density. The obtained nanoparticles suspensions were analyzed by UV-Vis absorbance. We observed a clear decrease of peak absorption of nanoparticles suspensions as the scanning density increases. This means that increasing the amount of overlapping pulses decreases the production of nanoparticles by laser ablation.
Acnowledgements: Authors want to thank the technical assistance of Israel Ceja Andrade. DOOG and AMB want to thank CONACyT for their doctoral scholarships. This work was partially supported by U. de G. (under programs pro-SNI and PROCOFIN) and CONACyT (under grant CB156773).