Enhanced photochromic response of ormosil–phosphotungstate nanocomposite coatings doped with TiO2 nanoparticles - Gonçalves, Lidiane Patrícia; Ferreira Neto, Elias Paiva; Ullah, Sajjad; Souza, Luciana Valgas de; Ysnaga, Orlando Armando Elguera; Santos, Molíria Vieira dos; Ribeiro, Sidney José Lima; Rodrigues Filho, Ubirajara Pereira (Journal of Sol-Gel Science and Technology, 2015)