Volume 13, Issue 2 (Iranian Journal of Physics Research, Summer 2013)                   IJPR 2013, 13(2): 131-139 | Back to browse issues page

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Nasirian S, Milani Moghaddam H. The study of the change in the optical band-gap of titania nanoparticles supported on silica. IJPR. 2013; 13 (2) :131-139
URL: http://ijpr.iut.ac.ir/article-1-1330-en.html
University of Mazandaran
Abstract:   (8461 Views)

  In this letter, titania nanopowder and titania-silica nanocomposite were prepared using sol-gel method. Although the size of nanocrystallites and the mass fraction percent age of rutile phase ( after phase transformation ) were increased by increasing calcination in the two samples , their size in titania-silica nanocomposite was smaller than that in pure titania . Moreover, the calculations of the indirect optical band gap in the two samples show ed that by increasing temperature
up to the transition onset point a nd above, the optical band gap had a steady growth and the corresponding wavelength reduced. However , a remarkable red shift in the indirect optical band gap was noticed in both samples around the transition onset point . The red shift was observed more in silica-titania nano composite than in titania nanopowder . In addition, the indirect band gap of silica-titania nano composite was less than that of pure titania in the same temperature conditions.

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Type of Study: Research | Subject: General

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