Electronic Supplementary Information
Strain Induced Phase Formation, Microstructural Evolution and Bandgap Reduction in Strained TiO2 Nanocrystals Grown by Ball Milling
Gone Rajender1, P. K. Giri1, 2, [1]
1Department of Physics, Indian Institute of Technology Guwahati, Guwahati-781039, India
2Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati-781039, India
SI-1: Details of the photoluminescence and photocatalysis measurements
Steady state photoluminescence (PL) measurements were performed at room temperature in a commercial spectrofluorimeter (Fluoromax-4, Horiba Scientific) using a 405 nm laser (external) excitation and long pass filter. Photocatalysis experiment was performed using a commercial photocatalytic reactor (Lelesil Innovative system, Mumbai) with a programmable visible light source having wavelength range of 390-730 nm. Photodegradation of methylene blue (MB) by TiO2 NCs was studied by monitoring the decrease in the initial concentration of MB solution on exposure to visible light (250 W) for different time intervals up to 180 min. After each 15 min interval, part of the MB solution was taken out and centrifuged. The suspension was kept for absorption measurement in a UV-vis spectrophotometer (UV-3101PC, Shimadzu). We also performed photocatalytic test for blank MB solution without any catalyst for same irradiation time.
[1] Corresponding Author: P. K. Giri; email id: ; ph: +91 361 3582703