Strong, Rapid, and Reversible Photochromic Response of Nb Doped TiO Nanocrystal Colloids in Hole Scavenging Media.

Understanding photochromicity is essential for developing new means of modulating the optical properties and optical response of materials. Here, we report on the synthesis and exciting new photochromic behavior of Nb doped TiO nanoparticle colloids (NCs). We find that, in hole scavenging media, Nb doping significantly improves the photochromic response time of TiO nanoparticles.