Chemical and physical routes have been widely used to prepare
metal nanoparticles. The physical approach involves several methods
such as evaporation-condensation or laser ablation while the most
employed method is the chemical reduction of themetal ions, followed
by subsequent formation ofmetal clusters. Radiation-chemicalmethods
such as ultraviolet and microwave radiation, photochemical and
sonoelectrochemical methods were also used [4]. Traditional synthesis
methods of nanomaterials require considerable amount of energy and
generate of large amounts of toxic chemicals or hazardous substances.
That's why there is an increasing world-wide concern in obtaining
nanoparticles using clean, non-toxic, environmental friendly procedures
which follow the “green chemistry” principles