Abstract
We investigated the morphology of silicon nanoparticles prepared using laser ablation in liquid through varying the energy density and laser irradiation time. Silicon nanoparticles were prepared using laser ablation in liquid. A silicon wafer was irradiated in ethanol using a laser beam (Nd: YAG/second harmonic generation, 532 nm). Crystalline silicon nanoparticles approximately 6 nm in size were observed by TEM observation. The quantity of silicon nanoparticles proportionally increased with an increase in energy density greater than the laser ablation threshold. This quantity also increased with an increase in laser irradiation time without saturation due to absorption of the nanoparticles in liquid in the light path.
Highlights
Silicon nanoparticles are important for applications such as optoelectronics [1], [2] and bioimaging [3],[4]
The Raman peak for silicon dioxide is attributed to the silicon wafer native oxide layer or oxidation of the prepared silicon nanoparticles during Raman spectra
An increase in energy density proportionally increased the quantity of silicon nanoparticles
Summary
Silicon nanoparticles are important for applications such as optoelectronics [1], [2] and bioimaging [3],. Small nanoparticles less than the de Broglie wave of an electron and the hole or Bohr radius of exciton produce a quantum effect. Laser ablation in liquid is one method for synthesizing nanoparticles This method produces nanoparticles by irradiating a target in solution using a laser with high energy density. Laser ablation in liquid is advantageous for producing silicon nanoparticles because silicon nanoparticles can be stably maintained on a particle surface by using ethanol as solvent [18]. Silicon nanoparticles have attracted attention, but it is difficult to produce high quantities by laser ablation in liquid. This study explores fabrication of silicon nanoparticles using laser ablation in liquid for applications such as a quantum-dot-sensitized solar cell. The laser energy density and irradiation time were investigated for their dependence on nanoparticle size and quantity
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