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Synthesis of si nanoparticles from freestanding porous silicon (PS) film using ultrasonication

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Title Synthesis of si nanoparticles from freestanding porous silicon (PS) film using ultrasonication
 
Creator KALE, PG
SOLANKI, CS
 
Subject raman-spectroscopy
nanocrystals
 
Description Porous Silicon (PS) is one of the established materials and can be used in variety of applications in its different forms. Use of monolayer PS film for synthesis of Si QDs is reported here. Nanometer-sized silicon particles are produced by ultrasonic dispersion of thin films in DI water. PS films are characterized using cross sectional scanning electron microscopy and gravimetric analysis while the Si nanopowder is characterized by Raman spectroscopy, Photoluminescence (PL), UV-visible spectroscopy (UV-vis) and FTIR spectroscopy. Sonication for hours causes breaking and oxidation in the film. This reflects as frequency downshift in Raman spectroscopy. Raman peak are resolved into two peaks to study shell type structure of Si nanopowder synthesized. PL exhibits overall red peak shift. Decreasing Tauc bandgap and sharp absorption edge in UV-vis spectra confirms the presence of oxygenated Si nanoparticles in the material tested, confirmed by FTIR. Analysis of all spectra is explained in terms of shell structured Si nanoparticles with Quantum Confinement Luminescent Centre (QCLC) model.
 
Publisher IEEE
 
Date 2011-10-25T07:19:40Z
2011-12-15T09:11:38Z
2011-10-25T07:19:40Z
2011-12-15T09:11:38Z
2010
 
Type Proceedings Paper
 
Identifier 35TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE,
978-1-4244-5891-2
0160-8371
http://dspace.library.iitb.ac.in/xmlui/handle/10054/15643
http://hdl.handle.net/100/2196
 
Source 35th IEEE Photovoltaic Specialists Conference,Honolulu, HI,JUN 20-25, 2010
 
Language English