Conducting FTO coatings produced using ultrasonic spray pyrolysis for heating applications

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2018

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Süer, Başar

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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.

Subject Keywords

Metal coating., Stee

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http://etd.lib.metu.edu.tr/upload/12622517/index.pdf
https://hdl.handle.net/11511/27468

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Graduate School of Natural and Applied Sciences, Thesis

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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.