Fabrication of titanium dioxide nanorods array for ultraviolet sensor application

Mohammad Mokhtar, Salina (2017) Fabrication of titanium dioxide nanorods array for ultraviolet sensor application. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Pure rutile titanium dioxide nanorods thin film for ultraviolet sensor application was fabricated on top of bare FTO substrates using hydrothermal method. TiO2 thin film was developed by optimizing amount of titanium butoxide (TBOT) as a precursor, amount of hydrochloric acid, and hydrothermal reaction time. Basically, there were four properties studied; surface morphology, structural, electrical, and optical properties. Surface morphology of the sample was analyzed by using FESEM. XRD and Raman spectroscopy were used to analyze the structural properties of the thin film. Electrical and optical properties were studied using 2-point probe and UV-vis- NIR spectrophotometer. The first optimization step was to vary the amount of precursor used. Surface morphology of the sample shows that the nanorods growth starts at 3.5 mL of TBOT, and as the precursors increased, diameter and the thickness of the nanorods also increased. Both XRD and Raman show the peaks of FTO and rutile TiO2. Next, the hydrothermal reaction time was varied. Nanorods diameter and thickness increase with increasing reaction time. XRD and Raman depict FTO and rutile TiO2 peaks produced. Lastly, the effect of using different amount of hydrochloric acid used was studied. The diameter and thickness of the nanorods decrease as the HCl used increased. Thin film produced was rutile TiO2 confirmed by both XRD and Raman spectra. The optimized amount of precursor, reaction time, and amount of HCl were obtained at 4.0 mL of TBOT, 16 hour, and 130 mL of HCl, respectively. Study on the optical properties of the TiO2 thin film shows absorption on ultraviolet wavelength and not on visible wavelength. Electrical analysis shows that the electron flows through TiO2/FTO interface with conductivity of 0.167 S/m. The thin film was then tested as UV sensor using photoelectrochemical (PEC) method. The rise and decay time recorded was less than then 1 second, indicating a rapid photoresponse characteristics and the photocurrent gives acceptable differences with change in the supplied bias voltage.

Item Type:Thesis (Masters)
Subjects:T Technology > TP Chemical technology > TP250-261 Industrial electrochemistry
ID Code:9893
Deposited By:Mr. Mohammad Shaifulrip Ithnin
Deposited On:27 Mar 2018 12:00
Last Modified:27 Mar 2018 12:00

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