Generation of nanstructures via conventional pulsed laser ablation in liquid (PLAL):
The Surface Plasmon Resonance (SPR) activity of metallic nanostructures is strongly dependent on their surface chemistry. Various metal-based nanostructures have been successfully synthesized by chemical methods, however, their surface features are not optimal for sensing, due to the existence of surface stabilizing molecules or tightly adsorbed reaction residues, which exerts a “barrier” effect to SPR. Therefore, metallic nanostructures with relatively “bare and clean” surfaces are highly desired for efficient SPR generation. Nanostructures synthesized via a pulsed laser ablation in liquid (PLAL) of a solid target placed in a liquid medium (i.e., water or solvent) without addition of chemicals, exhibit a unique relatively “bare and clean” surface making them a good candidate for myriad of applications including sensing.
Generation of nanstructures using our technology: Stable colloid nanoparticles with tunable properties via pulsed nanosecond laser ablation in thermo-reactor.
Two kind of lasers have been commonly used to achieve this ablation. A nanosecond pulsed laser with a pulse duration between 1-100 nanoseconds (ns), and an ultrashort pulsed laser with a pulse duration between 1 femtosecond (fs) and 10 picoseconds (ps). The advantage of nanosecond pulsed laser is its high power and high ablation rates. However, the long pulse lead to generate a high heat in the target material. This affects not only the quality of synthetized particles but also the atomic species evaporated by the nanosecond laser ablation can react with the liquid to form undesired oxides or hydroxides in water, or carbonates in organic liquids. This high heat may further decompose the liquid and bring ligands to react with the target materials.
With our technology we are able to produce nanomaterials in liquid solution and, in particular, to tune their properties, among which their size and optical properties using thermoreactor which controls the liquid temperature during the nanosecond laser ablation.
Au@SiO2 nanoparticles data sheet
Material Safety Data Sheets (MSDS):
Optical humidity sensor (Maxwellian Inc.) integrating Pi-SOLTECH nanoparticles.