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. Dear user; Recently we have changed our software to Sinaweb. If you had already registered with the old site, you may use the same USERNAME but you need to change your password. To do so at the first use, please choose, 2019; 13(2): 131-139.
