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.
Nasirian,S and Milani Moghaddam,H . (2019). The study of the change in the optical band-gap of titania nanoparticles supported on silica. Iranian Journal of Physics Research, 13(2), 131-139.
MLA
Nasirian,S , and Milani Moghaddam,H . "The study of the change in the optical band-gap of titania nanoparticles supported on silica", Iranian Journal of Physics Research, 13, 2, 2019, 131-139.
HARVARD
Nasirian S, Milani Moghaddam H. (2019). 'The study of the change in the optical band-gap of titania nanoparticles supported on silica', Iranian Journal of Physics Research, 13(2), pp. 131-139.
CHICAGO
S Nasirian and H Milani Moghaddam, "The study of the change in the optical band-gap of titania nanoparticles supported on silica," Iranian Journal of Physics Research, 13 2 (2019): 131-139,
VANCOUVER
Nasirian S, Milani Moghaddam H. The study of the change in the optical band-gap of titania nanoparticles supported on silica. Iranian Journal of Physics Research. 2019;13(2):131-139 (In Persian).
