Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Electrodeposition of zno thin films : effect of vanadium doping
Download
index.pdf
Date
2013
Author
Avşar, Cemre
Metadata
Show full item record
Item Usage Stats
202
views
70
downloads
Cite This
The aim of this study was preparation and characterization of photocatalytically active ZnO thin films on ITO glass sheets by electrodeposition method. In order to investigate the effect of synthesis temperature on the morphology and photocatalytic activity of the thin films, synthesis was performed at room temperature and at 70 °C. Characterizaton of the thin films was carried out by AFM, SEM - EDX, XRD and XPS analysis. Photocatalytic activity of the samples was tested by methylene blue and stearic acid degradation tests. Methylene blue degradation tests were examined by obtaining the absorbance data between 200-800 nm by UV- Vis spectrophotometer. Stearic acid degradation tests were examined by monitoring the difference in the asymmetric C-H streching modes of CH3 groups and the symmetric- asymmetric C-H streching modes of CH2 groups in the region 2700-3000 cm-1 by FT- IR spectrophotometer. ZnO thin films were dip coated with a transition metal, vanadium, in order to investigate the effect of vanadium doping on the photocatalytic activity of thin films. Dip coating was performed with NH4VO3 solutions, in which NH4VO3 was dissolved in water and oxalic acid and vanadium was existing in (+5) and (+4) oxidation states, respectively. Photocatalytic activity tests performed by the degradation of methylene blue and stearic acid on both vanadium doped and undoped ZnO thin films synthesized at room temperature and 70 °C indicated that the photocatalytic activity of thin films had been improved by vanadium doping and it was also favored by the synthesis temperature. It was observed from SEM images that, vanadium was not homogenously dispersed on the surface of the thin films. SEM images also showed the effect of synthesis temperature on the morphology of the ZnO thin films. The oxidation state of vanadium was determined by XPS analysis.
Subject Keywords
Polymers.
,
Pigments.
,
Emulsions.
URI
http://etd.lib.metu.edu.tr/upload/12616401/index.pdf
https://hdl.handle.net/11511/23073
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Photocatalytic antimicrobial and self-cleaning properties of titana-silica mixed oxide thin films
Korkmaz Erdural, Beril; Bölükbaşı, Ufuk; Karakaş, Gürkan; Department of Chemical Engineering (2012)
In this study photocatalytic antibacterial and self-cleaning activities of TiO2-SiO2 thin films as a function of TiO2/SiO2 ratios were investigated. TiO2-SiO2 mixed oxides were synthesized by sol-gel method and coated over soda-lime glass plates by dip coating technique. Escherichia coli was used as a model microorganism for the photocatalytic antibacterial tests. Degradation rate of methylene blue (MB) molecules was used to characterize photocatalytic self-cleaning activities of thin film surfaces. The max...
Nanoheterogeneous ZrTa metallic glass thin films with high strength and toughness
Behboud, Ali B.; Motallebzadeh, Amir; Özerinç, Sezer (2022-04-25)
This study investigated the mechanical behavior of ZrxTa1−x (x = 21–79 at%) thin films and nanolayered films of ZrTa with modulated composition as model systems to gain insight into the hardness and toughness of metallic glasses and metallic glass nanocomposites. The monolithic films exhibit two primary microstructures, namely, a fully amorphous form (Zr = 35–70at%.) and an amorphous-crystalline composite (21–30 at% Zr). The amorphous films show a monotonic hardness variation with composition over a wide ra...
Space-charge-limited current analysis in amorphous InSe thin films
Yılmaz, Koray Kamil; Parlak, Mehmet (2004-04-01)
The study of space-charge-limited currents (SCLC) in amorphous InSe thin films is presented. The temperature-dependent current-voltage (J-V) measurements were carried out for TO/a-lnSe/Au sandwich structures in the range of 200-320 K. For all samples, ohmic behavior was observed up to an electric field strength of about 2 x 10(5) V cm(-1). From the temperature dependence of conductivity data, the position of the thermal equilibrium Fermi level E-fo is determined as 250 meV above the valence band E-v. At hig...
Preparation of lead free BZT-BCT thin films by chemical solution deposition and their characterization
Çeltikçi, Barış; Özenbaş, Ahmet Macit; Department of Metallurgical and Materials Engineering (2012)
In the presented thesis, lead-free Ba(Ti0.8Zr0.2)O3-(Ba0.7Ca0.3)TiO3 (BZT-BCT) thin films were deposited on Pt/TiO2/SiO2/Si substrates using chemical solution deposition method and then the effect of process parameters were investigated to obtain optimum parameters of these lead-free thin films. The phase was selected near to the morphotropic phase boundary (MPH) to increase the number of polarization directions where rhombohedral and tetragonal phases exist together. In this study, the effect of sintering ...
Admittance analysis of an MIS structure made with PECVD deposited a-SiNx : H thin films
Atilgan, I; Ozder, S; Ozdemir, O; Katircioglu, B (Elsevier BV, 1999-07-01)
a-SiNx:H thin films, prepared by the PECVD technique, were optically and electrically characterized. The frequency dependent trap admittance derived for the MIS structure in the accumulation gate voltage regime was revised. Based on these results an omitted multiplying factor was included into the derivation. An extension of the tunnelling model in the depletion bias regime was used in comparison with the widely accepted statistical model and finally, the more general feature of the tunnelling-based approac...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
C. Avşar, “ Electrodeposition of zno thin films : effect of vanadium doping,” M.S. - Master of Science, Middle East Technical University, 2013.