Preparation, structural and optical properties of ZnWO4 and CdWO4 nanofilms

For the first time, a novel route for preparing AWO4 (A=Zn, Cd) nanofilm on a glass substrate is proposed through the combination of reverse micelle system with dip-coating technology. Here collodion is used as a dispersant and film-forming agent to obtain nanofilm with a good quality and property. SEM and XRD results indicate ZnWO4 and CdWO4 nanoparticles with monoclinic system and wolframite structure are well dispersed on the substrate. The nanofilm’s photoluminescent(PL) bands obviously blue shift compared with bulk materials whereas red shift compared with nanoparticles, which should be due to quantum size effect and film-forming effect. FTIR absorption bands between 400 and 900 cm−1 prove the presence of ZnWO4 or CdWO4 nanoparticles on the substrate.