Structural, luminescence and electrical conductivity of strontium titanate thin films prepared by dip coating method

Strontium titanate (SrTiO3) sol-gel was deposited onto glass substrates by dip coating method. The effects of deposition parameters such as different annealing temperatures and number of coating layers were studied. Strontium nitrate anhydrous (Sr(NO3)2), titanium isopropoxide (C12H28O4Ti), ethylene...

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Main Author:	Maarof, Saleha
Format:	Thesis
Language:	English
Published:	2014
Subjects:	TA Engineering (General) Civil engineering (General)
Online Access:	http://eprints.utm.my/id/eprint/48626/1/SalehaMaarofMFS2014.pdf
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spelling	my-utm-ep.486262020-03-04T06:17:03Z Structural, luminescence and electrical conductivity of strontium titanate thin films prepared by dip coating method 2014 Maarof, Saleha TA Engineering (General). Civil engineering (General) Strontium titanate (SrTiO3) sol-gel was deposited onto glass substrates by dip coating method. The effects of deposition parameters such as different annealing temperatures and number of coating layers were studied. Strontium nitrate anhydrous (Sr(NO3)2), titanium isopropoxide (C12H28O4Ti), ethylene glycol (HOCH2CH2OH) and nitric acid (HNO3) were used to prepare sol-gel of strontium titanate. Ethylene glycol was added to promote polymerization between C12H28O4Ti and Sr(NO3)2. The samples structure were characterized by X-ray diffraction (XRD), atomic force microscopy (AFM), Fourier transform infra red (FT-IR) and photoluminescence (PL) spectroscopy. XRD analysis showed the process of the intermediate crystalline phase of Sr(NO3)2 with lattice parameter a = b = c = 0.78 nm for as-prepared sample. An amorphous inorganic phase was found for samples annealed at 300 and 400 °C. The samples began to change to SrTiO3 phase after being annealed at 500 °C with lattice parameter a = b = c = 0.39 nm and peak orientation at planes (110), (111), (200) and (211). Thin films with double coating layers showed clearer peaks orientation. The microstructure study using AFM revealed the grain size in the range 220 – 460 nm and surface roughness in the range 33 – 69 nm at 500 ºC for different number of coating layers. FT-IR analysis shows that SrTiO3 crystallization phase was completely formed at higher temperatures of 500, 600 and 700 ºC. PL spectroscopy of SrTiO3 thin films appeared to have spectra emission in the region of 310 - 510 nm wavelength. The spectra also showed the different peaks appearing at different annealed temperatures. Van der Pauw technique was used to measure the electrical conductivity and activation energy for single and four coating layers samples at 500 ºC annealing temperature. The results showed that the electrical conductivity for single layer was higher than the four coating layers. Activation energy in high temperature region were in the range of 0.656 meV and 0.446 meV whereas activation energy in low temperature region were in the range of 0.162 meV and 0.105 meV for single and four coating layers samples, respectively. 2014 Thesis http://eprints.utm.my/id/eprint/48626/ http://eprints.utm.my/id/eprint/48626/1/SalehaMaarofMFS2014.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:90599?queryType=vitalDismax&query=Structural%2C+luminescence+and+electrical+conductivity+of+strontium+titanate+thin+films+prepared+by+dip+coating+method&public=true masters Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TA Engineering (General) Civil engineering (General)
spellingShingle	TA Engineering (General) Civil engineering (General) Maarof, Saleha Structural, luminescence and electrical conductivity of strontium titanate thin films prepared by dip coating method
description	Strontium titanate (SrTiO3) sol-gel was deposited onto glass substrates by dip coating method. The effects of deposition parameters such as different annealing temperatures and number of coating layers were studied. Strontium nitrate anhydrous (Sr(NO3)2), titanium isopropoxide (C12H28O4Ti), ethylene glycol (HOCH2CH2OH) and nitric acid (HNO3) were used to prepare sol-gel of strontium titanate. Ethylene glycol was added to promote polymerization between C12H28O4Ti and Sr(NO3)2. The samples structure were characterized by X-ray diffraction (XRD), atomic force microscopy (AFM), Fourier transform infra red (FT-IR) and photoluminescence (PL) spectroscopy. XRD analysis showed the process of the intermediate crystalline phase of Sr(NO3)2 with lattice parameter a = b = c = 0.78 nm for as-prepared sample. An amorphous inorganic phase was found for samples annealed at 300 and 400 °C. The samples began to change to SrTiO3 phase after being annealed at 500 °C with lattice parameter a = b = c = 0.39 nm and peak orientation at planes (110), (111), (200) and (211). Thin films with double coating layers showed clearer peaks orientation. The microstructure study using AFM revealed the grain size in the range 220 – 460 nm and surface roughness in the range 33 – 69 nm at 500 ºC for different number of coating layers. FT-IR analysis shows that SrTiO3 crystallization phase was completely formed at higher temperatures of 500, 600 and 700 ºC. PL spectroscopy of SrTiO3 thin films appeared to have spectra emission in the region of 310 - 510 nm wavelength. The spectra also showed the different peaks appearing at different annealed temperatures. Van der Pauw technique was used to measure the electrical conductivity and activation energy for single and four coating layers samples at 500 ºC annealing temperature. The results showed that the electrical conductivity for single layer was higher than the four coating layers. Activation energy in high temperature region were in the range of 0.656 meV and 0.446 meV whereas activation energy in low temperature region were in the range of 0.162 meV and 0.105 meV for single and four coating layers samples, respectively.
format	Thesis
qualification_level	Master's degree
author	Maarof, Saleha
author_facet	Maarof, Saleha
author_sort	Maarof, Saleha
title	Structural, luminescence and electrical conductivity of strontium titanate thin films prepared by dip coating method
title_short	Structural, luminescence and electrical conductivity of strontium titanate thin films prepared by dip coating method
title_full	Structural, luminescence and electrical conductivity of strontium titanate thin films prepared by dip coating method
title_fullStr	Structural, luminescence and electrical conductivity of strontium titanate thin films prepared by dip coating method
title_full_unstemmed	Structural, luminescence and electrical conductivity of strontium titanate thin films prepared by dip coating method
title_sort	structural, luminescence and electrical conductivity of strontium titanate thin films prepared by dip coating method
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2014
url	http://eprints.utm.my/id/eprint/48626/1/SalehaMaarofMFS2014.pdf
_version_	1747817436362571776

Structural, luminescence and electrical conductivity of strontium titanate thin films prepared by dip coating method

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