Nanoparticle Formation by Femtosecond Laser Ablation
Ultra short femtosecond (fs) pulses for the laser ablation of materials lead to deposited films which are very different from those obtained by the well-known classical nanosecond (ns) pulsed laser deposition (PLD). In very specific cases, epitaxial thin films can be obtained, whereas in the majority of materials, the films formed by fs PLD are constituted by the random stacking of nanoparticles (Nps) in the 10–100 nm size range. As a result, fs PLD has been rapidly considered as a viable and efficient method for the synthesis of Nps of a wide range of materials presenting interesting physical properties and potential applications. The Np synthesis by fs laser ablation has been studied, and theoretical investigations have been reported to establish their formation mechanisms. Two possibilities can be assumed to explain the Np synthesis: direct cluster ejection from the target or collisional sticking and aggregation in the ablated plume flow.
KeywordsLaser Ablation Nanoparticle Formation Plasma Plume Rutherford Backscatter Spectrometry Beam Spot Size
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The authors would like to thank O. Albert and J. Etchepare for the use of the femtosecond laser facility in LOA laboratory (ENSTA), Palaiseau, France and their fruitful collaboration in this work.
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