Browsing by Author "Tepehan, Fatma Zehra"
Now showing items 1-12 of 12
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Atomic force microscopy and spectroscopy studies of annealed Ce/Ti/Zr mixed oxide thin films prepared by sol-gel process
Ghodsi, Farhad E.; Tepehan, Fatma Zehra; Tepehan, Galip Gültekin (Elsevier Science Bv, 2006)Mixed Ce/Ti/Zr oxide thin films with a molar ratio of 0.5:0.25:0.25 were prepared using the sol-gel process and deposited on glass substrates by the dip coating technique. The effect of heat treatment temperature on surface ... -
Characterization Of Mps Capped Cds Quantum Dots And Formation Self-Assembled Quantum Dots Thin Films On A Glass Substrate
Koç, Kenan; Tepehan, Fatma Zehra; Tepehan, Galip Gültekin (Natl Inst R&D Materials Physics, 2011)Colloidal powdered and thin film forms of MPS capped CdS quantum dots have been produced by combination of colloidal chemistry and sol-gel method. Nanoparticles were self-assembled directly on a glass substrate using spin ... -
Controlling the growth of particle size and size distribution of silica nanoparticles by the thin film structure
Uysal, Bengü Özuğur; Tepehan, Fatma Zehra (Springer, 2012)Nanostructured silicondioxide thin films were prepared by sol-gel spin coating technique. The SiO2 films were made using a conventional mixture of tetraethoxysilane (TEOS) deionized water and ethanol with various NH3/TEOS ... -
Derivation of the optical constants of spin coated CeO2-TiO2-ZrO2 thin films prepared by sol-gel route
Ghodsi, Farhad E.; Tepehan, Fatma Zehra; Tepehan, Galip Gültekin (Pergamon-Elsevier Science Ltd, 2011)Ternary thin films of cerium titanium zirconium mixed oxide were prepared by the sol-gel process and deposited by a spin coating technique at different spin speeds (1000-4000 rpm). Ceric ammonium nitrate ce(NO3)(6)(NH4)(2) ... -
Determination of growth kinetics and size dependent structural morphological optical characteristics of sol-gel derived silica nanoparticles in silica matrix
Uysal, Bengü Özuğur; Tepehan, Fatma Zehra (De Gruyter Poland Sp Zoo, 2019)Nanocomposite silica thin films made using the sol-gel method were studied. The nano-silica films were prepared using a mixture of tetraethyl orthosilicate (TEOS) deionized water ethanol and ammonia solution. To control ... -
Electrochromic properties of heat-treated thin films of CeO2-TiO2-ZrO2 prepared by sol-gel route
Ghodsi, Farhad E.; Tepehan, Fatma Zehra; Tepehan, Galip Gültekin (Elsevier Science Bv, 2008)CeO2-TiO2-ZrO2 thin films were prepared using the sol-gel process and deposited on glass and ITO-coated glass substrates via dipcoating technique. The samples were heat treated between 100 and 500 degrees C. The heat ... -
Growth kinetics of MPS-capped CdS quantum dots in self-assembled thin films
Koç, Kenan; Tepehan, Fatma Zehra; Tepehan, Galip Gültekin (Springer, 2012)For this study we prepared colloidal CdS quantum dots using 3-mercaptopropyltrimethoxysilane as capping agent. Colloidal CdS quantum dots were directly deposited on glass substrates by a spin-coating process. Coated ... -
Influence of pH on the optical and structural properties of spin coated CeO2-TiO2 thin films prepared by sol-gel process
Ghodsi, Farhad E.; Tepehan, Fatma Zehra; Tepehan, Galip Gültekin (Elsevier Science Bv, 2007)Optical and structural properties of mixed CeO2-TiO2 thin films have been investigated by varying the pH of the coating sol. The films were prepared by sol-gel process using spin-coating technique with a spin speed of 2500 ... -
Modeling the optical properties of WO(3) and WO(3)-SiO(2) thin films
Saygin-Hinczewski, Dursen; Hinczewski, Michael; Sorar, İdris; Tepehan, Fatma Zehra; Tepehan, Galip Gültekin (Elsevier Science Bv, 2008)The optical properties and surface morphology of sol-gel spin coated WO(3) and WO(3)-SiO(2) composite films annealed at 250 and 400 degrees C are investigated. For the purpose of extracting the optical parameters of the ... -
Optical and structural properties of sol-gel made Ce/Ti/Zr mixed oxide thin films as transparent counter electrode for electrochromic devices
Ghodsi, Farhad E.; Tepehan, Fatma Zehra; Tepehan, Galip Gültekin (Elsevier Science Bv, 2008)Ce/Ti/Zr mixed oxide thin films were prepared using sol-gel process with mole ratios from 45/5 to 5/45 of Ti/Zr and 50 of Cc and deposited by dip coating technique. Optical electrochromic and structural properties of such ... -
Optical and structural properties of Ta2O5-CeO2 thin films
Saygın-Hinczewski, Dursen; Koç, Kenan; Sorar, İdris; Hinczewski, Michael; Tepehan, Fatma Zehra; Tepehan, Galip Gültekin (Elsevier Science Bv, 2007)In this study the sol-gel spin-coating method has been used to make Ta2O5-CeO2 thin films. These films have been prepared in various composition ratios to observe changes in their optical and structural properties. Reflectance ... -
Preparation and characterization of self-assembled thin film of MPS-capped ZnS quantum dots for optical applications
Koç, Kenan; Tepehan, Fatma Zehra; Tepehan, Galip Gültekin (Hindawi Publishing Corporation, 2012)For this study we prepared colloidal ZnS quantum dots using 3-mercaptopropyltrimethoxysilane (MPS) as the capping agent. Colloidal ZnS quantum dots were directly deposited on glass substrates by a spin coating process. ...