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Your search keyword '"Ugur Unal"' showing total 3 results
Start Over Author "Ugur Unal" Publisher royal society of chemistry (rsc)
3 results on '"Ugur Unal"'

1. Morphology and crystal structure control of α-Fe2O3 films by hydrothermal-electrochemical deposition in the presence of Ce3+ and/or acetate, F− ions

Author

Ugur Unal, Ceren Yilmaz, Yılmaz, Özgür (ORCID 0000-0002-6216-9341 & YÖK ID 108638), Ünal, Uğur, College of Administrative Sciences and Economics, College of Sciences, Department of Economics, and Department of Chemistry

Subjects
Materials science, Akaganéite, General Chemical Engineering, Iron oxide, Nanotechnology, 02 engineering and technology, Crystal structure, engineering.material, 010402 general chemistry, 01 natural sciences, chemistry.chemical_compound, Phase (matter), Thin film, Lepidocrocite, General Chemistry, Hematite, 021001 nanoscience & nanotechnology, 0104 chemical sciences, chemistry, Chemical engineering, visual_art, engineering, visual_art.visual_art_medium, Particle size, Multidisciplinary chemistry, 0210 nano-technology
Abstract

Hydrothermal-electrochemical growth of Hematite (alpha-Fe2O3) thin films in the presence of Ce3+ and/or CH3COO- and F- ions is reported. Primary attention is paid to understanding the synergistic effect of temperature and additive ions on the growth of Hematite particles. The literature describes the shape-controlled electrodeposition of iron oxide films, but these reports involve low-temperature depositions (, Koç University Faculty of Science; Turkish Ministry of Development

Published
2016
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2. Single step synthesis of (α-Fe2O3) hematite films by hydrothermal electrochemical deposition

Author

Ugur Unal, Ceren Yilmaz, Yılmaz, Ceren, Ünal, Uğur, Graduate School of Sciences and Engineering, College of Sciences, and Department of Chemistry

Subjects
Photocurrent, Materials science, Morphology (linguistics), General Chemical Engineering, Inorganic chemistry, Single step, General Chemistry, Hematite, Electrochemistry, Hydrothermal circulation, Thin-films, Photoelectrochemical properties, Water photooxidation, Nanotube arrays, Alpha-Feooh, Oxide-films, Growth, Electrodeposition, Nanostructures, Performance, visual_art, Phase (matter), visual_art.visual_art_medium, Multidisciplinary chemistry, Deposition (law)
Abstract

A single step electrodeposition of alpha-Fe2O3 films under hydrothermal conditions without post-annealing requirement is described. Primary attention is paid to understand the effects of synthesis conditions, such as temperature, precursor concentration, pH, and time on the structure and morphology of the films. Moreover, the photoelectrochemical properties of hematite films grown by hydrothermal-electrochemical deposition (HED) are also discussed. It is discovered that HED enables the production of crystalline alpha-Fe2O3 phase without thermal annealing as opposed to electrodepositions reported at ambient temperature. Photoelectrochemical studies demonstrated that better performance can be obtained with the films prepared at higher pH. A net photocurrent density of 23.6 mu A cm(-2) is obtained in 0.1 M NaOH under 1 sun conditions at 1.23 V vs. NHE with the film prepared from a bath containing 0.05 M FeCl2 and 0.2 M NaCH3COO via hydrothermal-electrodeposition with a photocurrent onset potential of 0.96 V vs. NHE., Koç University Faculty of Science; Turkish Ministry of Development

Published
2015
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3. CdTe quantum dot sensitized hexaniobate nanoscrolls and their photoelectrochemical properties

Author

Ugur Unal, Funda Havva Yagci Acar, Ceren Yilmaz, Feriha Eylul Sarac, Saraç, Feriha Eylül, Yılmaz, Ceren, Acar, Funda Havva Yağcı (ORCID 0000-0001-5601-8814 & YÖK ID 178902), Ünal, Uğur, Koç University Surface Science and Technology Center (KUYTAM) / Koç Üniversitesi Yüzey Araştırmaları Merkezi (KUYTAM), College of Sciences, and Department of Chemistry

Subjects
Chemistry, Electrophoretic deposition, Materials science, Quantum dot, General Chemical Engineering, Self-assembly deposition, Layered niobate k4nb6o17, Solar-cells, Semiconductor nanocrystals, Nanosheets, Complexes, Oxide, Films, Nanotechnology, General Chemistry, Quantum, Cadmium telluride photovoltaics
Abstract

We have constructed hybrid quantum dot-layered niobate films with an electrophoretic deposition method. The structure and photoelectrochemical behaviour were demonstrated., Scientific and Technological Research Council of Turkey (TÜBİTAK); Turkish Ministry of Development

Published
2012
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