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TiO2 anatase nanocrystals were prepared by solvothermal processing of Ti chloroalkoxide in oleic acid, in the presence of W chloroalkoxide, with W/Ti nominal atomic concentration (Rw) ranging from 0.16 to 0.64. The as-prepared materials were heat-treated up to 500 °C for thermal stabilization and sensing device processing. For R0.16, the as-prepared materials were constituted by an anatase core surface-modified by WOx monolayers. This structure persisted up to 500 °C, without any WO3 phase segregation. For Rw up to R0.64, the anatase core was initially wrapped by an amorphous WOx gel. Upon heat treatment, the WOx phase underwent structural reorganization, remaining amorphous up to 400 °C and forming tiny WO3 nanocrystals dispersed into the TiO2 host after heating at 500 °C, when part of tungsten also migrated into the TiO2 structure, resulting in structural and electrical modification of the …
American Chemical Society
Publication date: 
1 Apr 2015

Mauro Epifani, Raül Díaz, Carmen Force, Elisabetta Comini, Marta Manzanares, Teresa Andreu, Aziz Genç, Jordi Arbiol, Pietro Siciliano, Guido Faglia, Joan R Morante

Biblio References: 
Volume: 7 Issue: 12 Pages: 6898-6908
ACS Applied Materials & Interfaces