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      Post-Treatment od Silicon Nanocrystals Produced by Ultra-Short Pulsed Laser Ablation in Liquid: Toward Blue Luminescent Nanocrystal Generation

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      Author
      Alkis, S.
      Okyay, Ali Kemal
      Ortac, B.
      Date
      2012-01-11
      Source Title
      Journal of Physical Chemistry C
      Print ISSN
      1932-7447
      Publisher
      American Chemical Society
      Volume
      116
      Issue
      5
      Pages
      3432 - 3436
      Language
      English
      Type
      Article
      Item Usage Stats
      119
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      92
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      Abstract
      Blue luminescent colloidal silicon nanocrystals (Si-NCs) were produced in a two-stage process. In the first step, synthesis of Si-NCs was achieved by femtosecond pulsed laser ablation of a silicon wafer, which was immersed in deionized water. The size and the structural and the chemical characteristics of colloidal Si-NCs were investigated by TEM and EDAX analyses, and it is found out that the Si-NCs are in spherical shape and the particle diameters are in the range of 5-100 nm. In the second step, ultrasonic waves and filtering chemical-free post-treatment of colloidal Si-NCs solution was performed to reduce the particle size. High-resolution TEM (HRTEM) studies on post-treated colloidal solution clearly show that small (1-5.5 nm in diameter) Si-NCs were successfully produced. Raman spectroscopy results clearly confirms the generation of Si nanoparticles in the crystalline nature, and the Raman scattering study of post-treated Si-NCs confirms the reduction of the particle size. The UV-vis absorption and photoluminescence (PL) spectroscopy studies elucidate the quantum confinement effect of Si-NCs on the optical properties. The colloidal Si-NCs and post-treated Si-NCs solutions present strong absorption edge shifts toward UV region. Broadband PL emission behavior is observed for the initial colloidal Si-NCs, and the PL spectrum of post-treated Si-NCs presents a blue-shifted broadband PL emission behavior due to the particle size reduction effect.
      Keywords
      Absorption edges
      Blue-shifted
      Chemical characteristic
      Colloidal solutions
      Crystalline nature
      Femtosecond pulsed laser ablation
      High-resolution tem
      Luminescent nanocrystals
      Particle diameters
      Particle size reduction
      Pl emission
      Pl spectra
      Post treatment
      Quantum confinement effects
      Si nanoparticles
      Silicon nanocrystals
      Spherical shape
      Two-stage process
      Uv region
      Uv-vis absorptions
      Permalink
      http://hdl.handle.net/11693/13295
      Published Version (Please cite this version)
      http://dx.doi.org/10.1021/jp211521k
      Collections
      • Department of Electrical and Electronics Engineering 3524
      • Institute of Materials Science and Nanotechnology (UNAM) 1775
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