Abstract
The synthesis of high purity ligand free nanoparticles represents one of the requirements for nanotechnology application in highly relevant fields as nanomedicine and theranostics. Laser synthesis and processing of colloids permits the synthesis of ligand free nanoparticles with reduced impurities from bulk targets and colloidal dispersions. In the present contribution a novel approach for enhanced production of ligand free gold nanoparticles by femtosecond ablation of a bulk target is studied together with a more efficient synthesis of fluorescent carbon quantum dots from a colloidal suspension of carbon microparticles in polyethylene glycol.
Highlights
As nanotechnology spreads over more and more applications, the necessity of synthesizing nanoparticles is growing, together with the aim to find specific synthesis routes for application related requirements such as high purity, stability or morphology control
Between the different techniques employed, laser synthesis and processing of colloids (LSPC) represent a group of laser based techniques able to generate nanomaterials from bulk targets, laser ablation in liquids (LAL), and from microparticles dispersions, laser fragmentation in liquids (LFL). These synthesis routes are based on the irradiation with a high power laser of a bulk target immersed in a liquid or a colloidal dispersion of particles to promote the extraction of nanoparticulate materials that get collected in the liquid [1]
A simultaneous spatial and temporal focusing (SSTF) optical setup is used to study the reduction of nonlinear effects in the liquid and the viability of femtosecond pulses for high nanoparticle production in LAL [8]
Summary
As nanotechnology spreads over more and more applications, the necessity of synthesizing nanoparticles is growing, together with the aim to find specific synthesis routes for application related requirements such as high purity, stability or morphology control. Between the different techniques employed, laser synthesis and processing of colloids (LSPC) represent a group of laser based techniques able to generate nanomaterials from bulk targets, laser ablation in liquids (LAL), and from microparticles dispersions, laser fragmentation in liquids (LFL). The inherent benefits of LAL and LFL are the reduction of byproducts generated in the process as only the base liquid and the target are needed It permits the synthesis of ligand free nanoparticles and alloys [2] that are highly demanded in nanomedicine [3], catalysis [4], or additive manufacturing [5].
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