OPTICAL-PROPERTIES OF CO AND CO-FE-CR THIN-FILMS DEPOSITED FROM AN AEROSOL ON GLASS SUBSTRATES

Thin films of Co and Co-Fe-Cr metal oxide films were prepared by depos ition of an aerosol generated pneumatically from aqueous nitrate solut ions. As substrates commercial gray glass has been used. Thermogravime tric (TG, DTG) and DTA measurements of initial nitrate components and their homogenized mixture were performed, and optical properties of de posited films important for privacy purposes (reflectance, transmittan ce), in the UV-visible and near-infrared regions up to 4761 nm as well as their surface roughness were measured. The reflectance values, def ined at 550 nm wavelength, were 20-30% for Go-oxide films and 20-25% f or Co-Fe-Cr films compared to 10-15% reported in literature. Transmitt ance values were 14-28% and 24-36%, respectively. For the substrate (u ncoated gray glass) also used as a reference, these corresponding valu es were 5 and 57%. The surface roughness R-a correlates with the main deposition parameters, such as temperature and time of deposition, and the molarity of solutions used. Crystallinity in Go-oxide films has b een detected by X-ray measurements. (C) 1998 Elsevier Science S.A. All rights reserved.