Showing papers by "Sounak Roy published in 2005"
TL;DR: In this article, a 5-7 nm size, highly crystalline TiO2 which absorbs radiation in the visible region of solar spectrum was synthesized, which showed higher photocatalytic activity both in UV and visible regions of the solar radiation compared to commercial Degussa P25 TiO 2.
Abstract: We have synthesized 5–7 nm size, highly crystalline TiO2 which absorbs radiation in the visible region of solar spectrum. The material shows higher photocatalytic activity both in UV and visible region of the solar radiation compared to commercial Degussa P25 TiO2. Transition metal ion substitution for Ti4+ creates mid-gap states which act as recombination centers for electron-hole induced by photons thus reducing photocatalytic activity. However, Pt, Pd and Cu ion substituted TiO2 are excellent CO oxidation and NO reduction catalysts at temperatures less than 100° C.
37 citations