Laser ablation synthesis in solution
Encyclopedia
LASiS is the acronym for Laser Ablation Synthesis in Solution and it is a commonly used method for obtaining colloidal solution of nanoparticle
s in a variety of solvent
s.
In the LASiS method, nanoparticles are produced during the condensation of a plasma plume formed by the laser ablation
of a bulk metal plate dipped in a liquid solution. LASiS is usually considered a top–down physical approach In the past years, laser ablation synthesis in solution (LASiS) emerged as a reliable alternative to traditional chemical reduction methods for obtaining noble metal nanoparticles (NMNp).
LASiS is a ‘‘green’’ technique for the synthesis of stable NMNp in water or in organic solvents, which does not need stabilizing molecules or other chemicals. The so obtained NMNp are highly available for further functionalization or can be used wherever unprotected metal nanoparticles are desired.
Surface functionalization
of NMNp can be monitored in real time by UV-visible spectroscopy of the plasmon resonance. However LASiS has some limitations in the size control of NMNp, which can be overcome by ‘‘chemical free’’ laser treatments of NMNp.
Nanoparticle
In nanotechnology, a particle is defined as a small object that behaves as a whole unit in terms of its transport and properties. Particles are further classified according to size : in terms of diameter, coarse particles cover a range between 10,000 and 2,500 nanometers. Fine particles are sized...
s in a variety of solvent
Solvent
A solvent is a liquid, solid, or gas that dissolves another solid, liquid, or gaseous solute, resulting in a solution that is soluble in a certain volume of solvent at a specified temperature...
s.
In the LASiS method, nanoparticles are produced during the condensation of a plasma plume formed by the laser ablation
Laser ablation
Laser ablation is the process of removing material from a solid surface by irradiating it with a laser beam. At low laser flux, the material is heated by the absorbed laser energy and evaporates or sublimates. At high laser flux, the material is typically converted to a plasma...
of a bulk metal plate dipped in a liquid solution. LASiS is usually considered a top–down physical approach In the past years, laser ablation synthesis in solution (LASiS) emerged as a reliable alternative to traditional chemical reduction methods for obtaining noble metal nanoparticles (NMNp).
LASiS is a ‘‘green’’ technique for the synthesis of stable NMNp in water or in organic solvents, which does not need stabilizing molecules or other chemicals. The so obtained NMNp are highly available for further functionalization or can be used wherever unprotected metal nanoparticles are desired.
Surface functionalization
Surface functionalization
Surface modification is the act of modifying the surface of a material by bringing physical, chemical or biological characteristics different from the ones originally found on the surface of a material....
of NMNp can be monitored in real time by UV-visible spectroscopy of the plasmon resonance. However LASiS has some limitations in the size control of NMNp, which can be overcome by ‘‘chemical free’’ laser treatments of NMNp.