Growth dynamics of nanoparticles in laser produced plasma in liquid ambient

Synthesis of titanium nanoparticles using pulsed laser ablation of titanium in de-ionized water and isopropanol is reported. In situ growth of nanoparticles was confirmed using Rayleigh scattering in liquid and air ambient. Nucleation and growth of nanoparticles in liquid ambient occurs much faster than in air. Synthesized nanoparticles were characterized using the x-ray diffraction, transmission electron microscopy and photoluminescence measurements. Nanoparticles thus produced are spherical in shape, have crystalline phase with size distribution 5-35 nm and the average size increases with the increase in laser fluence. The colloidal solutions of nanoparticles show broad photoluminescence emission in the range 300-500 nm on optical pumping with 266 nm. A comparative study of titanium plasma in liquid and air is reported to understand the formation of titanium nanoparticles from laser plasma confined in different ambient. (C) 2011 American Institute of Physics. [doi:10.1063/1.3642968]