Colloidal silicon nanoparticles synthesized by picosecond laser ablation

Characterization after aging of Si nanoparticles synthesized by picosecond laser ablation of solids in liquids

“…According to the results analyzed in Fig 1 and based on the study reported in reference [12], the laser ablation of Si using ps pulses in water allows to obtain nanoparticles with sizes below 5 nm that are capable of emitting visible light. Although a clear size trend was not observed with increasing fluence, slight modifications in the PL spectra can be induced.…”

“…Fig. 1d) shows the typical Raman spectrum for colloidal Si nanoparticles synthesized at 3.3 J/cm 2 [12]. A shift of the mode at 521 cm -1 can be clearly seen towards the lower frequencies range.…”

“…1 shows spectra for a representative sample synthesized at 3.3 J/cm 2 . Details of the synthesized nanoparticles dependence on fluence can be found elsewhere [12]. Fig.…”

“…Different approaches have been carried out to fabricate Si nanoparticles, however, the laser ablation of a solid target immersed in a liquid, has shown to be an excellent alternative to fabricate colloidal Si nanoparticles [9,[11][12][13][14][15][16][17] due to its ability to produce hazardous waste free suspensions and nanoparticles with low size polydispersity [18]. As compared to chemical routes for the synthesis of nanoparticles in which chemical precursors, stabilizers and surfactants are used, the laser ablation of solids in liquids offers the advantage of obtaining pure nanoparticles without generation of residues arising from all chemicals used for reactions [19][20][21], avoiding the need for washing procedures for the final products.…”