Conducting FTO coatings produced using ultrasonic spray pyrolysis for heating applications

Download
2018
Süer, Başar
In this thesis, fluorine doped tin dioxide (FTO) coatings were deposited on AISI 304 stainless steel (SS) substrates using ultrasonic spray pyrolysis (USP) technique. Four different candidate insulating intermediate layers of TiO2, MgO, Al2O3 and SiO2 were selected and coated on AISI 304 using USP and investigated in order to overcome dielectric breakdown of FTO layer due to conductive nature of stainless steel substrate under the applied voltage. After the optimization of the process parameters for the depositions, only TiO2 layer was successfully deposited while other oxides did not form continuous films on AISI-304 SS surface despite the efforts. SEM analysis, supported by back-scatter imaging, revealed thickness values of the layers for FTO and TiO2, individually. Heating performances of the samples with various sheet resistance values were examined under various applied voltages. Heating experiments showed that 300 oC can be reached with 10 V of applied voltage without occurrence of an electrical breakdown of FTO coating having 160 nm thickness with TiO2 intermediate layer of 660 nm. 28.6% efficiency of converting electrical energy into heat was calculated for thin FTO film while stainless steel showed only 7.3% efficiency. Also, cyclic heating experiments and humidity test indicated that FTO coatings are resistant against cyclic loadings and humid environment.

Suggestions

Conducting fluorine doped tin dioxide (FTO) coatings by ultrasonic spray pyrolysis for heating applications
Süer, Başar; Özenbaş, Ahmet Macit (2021-06-01)
Fluorine doped tin dioxide (FTO) coatings were deposited on AISI 304 stainless steel (SS) substrates using ultrasonic spray pyrolysis (USP) technique. Four different candidate insulating intermediate layers of TiO2, MgO, Al2O3 and SiO2 were selected and coated on AISI 304 SS using USP and investigated in order to overcome dielectric breakdown of FTO layer due to conductive nature of stainless steel substrate under the applied voltage. After the optimization of the process parameters for the depositions, onl...
EQUIVALENT STRAIN AND STRESS HISTORY IN TORSION TESTS
TEKKAYA, AE (1994-02-01)
Bulk and plane torsion tests are being used in industry to determine the flow curve of metals up to very high plastic strains. Despite their wide usage the experimental results obtained in torsion tests are still not being evaluated uniformly. Differences arise basically due to the conversion of the measured angle of twist into the corresponding equivalent strain. This paper shows that the often used equivalent strain expression by Nadai and Davis as well as Eichinger is invalid, since the so-called redunda...
FABRICATION AND CHARACTERIZATION OF TiO2 THIN FILM FOR DEVICE APPLICATIONS
HOSSEINI, AREZOO; GÜLLÜ, HASAN HÜSEYİN; COŞKUN, EMRE; Parlak, Mehmet; Erçelebi, Ayşe Çiğdem (2019-07-01)
Titanium oxide (TiO2) film was deposited by rectification factor (RF) magnetron sputtering technique on glass substrates and p-Si (111) wafers to fabricate n-TiO2/p-Si heterojunction devices for the investigation of material and device properties, respectively. The structural, surface morphology, optical and electrical properties of TiO(2 )film were characterized by means of scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD), UV-visual (UV-Vis) spectral and dark curre...
Synergistic effect of boron containing substances on flame retardancy and thermal stability of intumescent polypropylene composites
Yılmaz, Ayşen; BAYRAMLI, ERDAL (2010-12-01)
The synergistic effect of four different boron containing substances, zinc borate (ZnB), borophosphate (BPO4), boron silicon containing preceramic oligomer (BSi) and lanthanum borate (LaB), were studied to improve the flame retardancy of a polypropylene (PP) intumescent system composed of ammonium polyphosphate (APP) and pentaerythritol (PER). The flame retardancy of PP composites was investigated by limiting oxygen index (LOI). UL-94 standard, thermogravimetric analysis (TGA) and cone calorimeter tests. Th...
Ni and cu incorporated mesoporous nanocomposite catalytic materials
Nalbant, Asli; Doğu, Timur; Balci, Suna (2008-02-01)
Nickel and copper incorporated MCM-41-like mesoporous nanocomposite materials prepared by the direct hydrothermal synthesis and the impregnation procedures showed highly attractive pore structure and surface area results for catalytic applications. The XRD patterns showed that characteristic MCM-41 structure was preserved for the materials synthesized following an impregnation procedure before the calcination step. The surface area of the Cu impregnated material with a quite high Cu/Si atomic ratio (0.19) w...
Citation Formats
B. Süer, “Conducting FTO coatings produced using ultrasonic spray pyrolysis for heating applications,” M.S. - Master of Science, Middle East Technical University, 2018.