Synthesis of photoluminescent colloidal silicon nanoparticles by pulsed laser ablation in liquids

We performed pulsed laser ablation (PLA) of a silicon target in liquid environment to prepare a silicon colloid solution. The nanoparticles were observed by SEM and TEM measurements. The result of Raman scattering indicates that this particle is mainly composed of silicon nanocrystallites. The optic...

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Bibliographic Details
Published in:Journal of physics. Conference series 2007-04, Vol.59 (1), p.392-395
Main Authors: Umezu, I, Minami, H, Senoo, H, Sugimura, A
Format: Article
Language:English
Subjects:
Ablation
Biosensors
Colloids
Hexanes
Laser ablation
Nanoparticles
Photoluminescence
Physics
Pulsed lasers
Quantum confinement
Raman spectra
Silicon
Solvents
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Summary:We performed pulsed laser ablation (PLA) of a silicon target in liquid environment to prepare a silicon colloid solution. The nanoparticles were observed by SEM and TEM measurements. The result of Raman scattering indicates that this particle is mainly composed of silicon nanocrystallites. The optical gap energies of the colloid solutions varied by changing the solvents; 2.9 and 3.5 eV for colloids prepared in water and hexane, respectively. These colloid solutions showed efficient PL intensity. Since Si-(CH3)n related bonds were observed for the specimen prepared in hexane, surface effects other than the quantum confinement effect should be taken into account for the origin of the PL. Our results indicate that new kinds of Sibased colloid solutions can be prepared by PLA in solvent. Since the PL peak energies were sensitive to the surface conditions, these colloid solutions are promising for biological applications such as bio-sensors.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/59/1/083