Browsing by Author "Oliveira de, Peter W."
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- ItemCarboxylic acids and esters as scaffold for cavities in porous single layer anti-reflective coatings of silica-titania with excellent optical and mechanical properties(Wuhan : Scientific Research Publishing, 2014) Menezes, E.; König, Peter; Jilavi, Mohammad H.; Oliveira de, Peter W.; Alves Junior, S.Anti-reflective (AR) single layer of silica-titania (SiO2-TiO2) coatings were obtained from sols containing pyromellitic dianhydride (PMDA) derivatives and Ti and Si precursors on glass substrate by dip-coating method. The coatings showed very high optical quality and the transmission was improved to up to 98.5%. Furthermore, the coatings also presented good mechanical stability.
- ItemSynthesis and characterization of aluminum doped zinc oxide nanostructures via hydrothermal route(London : Hindawi, 2014) Alkahlout, Amal; Al Dahoudi, Naji; Grobelsek, Ingrid; Jilavi, Mohammad; Oliveira de, Peter W.Stable crystalline aluminum doped zinc oxide (AZO) nanopowders were synthesized using hydrothermal treatment processing. Three different aluminum precursors have been used. The Al-precursors were found to affect the morphology of the obtained nanopowders. AZO nanoparticles based on zinc acetate and aluminum nitrate have been prepared with different Al/Zn molar ratios. XRD investigations revealed that all the obtained powders have single phase zincite structure with purity of about 99%. The effect of aluminum doping ratio in AZO nanoparticles (based on Al-nitrate precursor) on structure, phase composition, and particle size has been investigated. The incorporation of Al in ZnO was confirmed by UV-Vis spectroscopy revealing a blue shift due to Burstein-Moss effect.