Titanium dioxide nanoparticles mediated surface plasmon resonance assisted optical properties of erbium-doped tellurite glass

Low emission and absorption cross-section of rare earth (RE) ion doped tellurite glasses that limit them from making solid state lasers needs further improvement. Combination of metal nanoparticles (NPs) with RE ions in the glass is proven to be prospective for overcoming such limitations. Via tunea...

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Main Author:	Yusof, Nur Nabihah
Format:	Thesis
Language:	English
Published:	2016
Subjects:	QC Physics
Online Access:	http://eprints.utm.my/id/eprint/78942/1/NurNabihahYusofMFS2016.pdf
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spelling	my-utm-ep.789422018-09-19T05:12:41Z Titanium dioxide nanoparticles mediated surface plasmon resonance assisted optical properties of erbium-doped tellurite glass 2016-07 Yusof, Nur Nabihah QC Physics Low emission and absorption cross-section of rare earth (RE) ion doped tellurite glasses that limit them from making solid state lasers needs further improvement. Combination of metal nanoparticles (NPs) with RE ions in the glass is proven to be prospective for overcoming such limitations. Via tuneable surface plasmon resonance (SPR) of metal NPs, an alteration in the optical properties of such glasses is feasible. In this view, present thesis takes an attempt to determine the mechanism of metal NPs SPR mediated modification in the optical properties of Erbium (Er3+) ions by embedding Titanium dioxide (TiO2) NPs into the tellurite glass. Five glass samples are prepared using melt-quenching technique with the composition (69-x)TeO2-20ZnO-10Na2O-1Er2O3-xTiO2, where x = 0.1, 0.2, 0.3, 0.4 mol%. Prepared samples are thoroughly characterized using X-ray diffraction (XRD), transmission electron microscope (TEM), energy dispersive X-ray (EDX), Fourier transform infrared (FTIR), Raman, ultraviolet-visible-near infrared (UV-Vis-NIR) and photoluminescence (PL) measurements. XRD pattern of achieved transparent glass samples confirmed their amorphous nature and TEM images revealed the existence of TiO2 NPs with average size between 16 to 22 nm. EDX spectra displayed the presence of Ti element in the sample together with other appropriate elemental traces. FTIR and Raman spectra showed different vibration modes of Te-O bond (bending, asymmetric and symmetric stretching) in the structural unit of TeO4 and TeO3. Glass containing 0.4 mol% of TiO2 NPs displayed an enhancement in the Raman signal by a factor of 1.56 to 3.58 for the bands centered at 388, 495, 673, 758 and 845 cm-1. This intensity enhancement is mainly attributed to the TiO2 NPs SPR assisted effects. Meanwhile, UV-Vis-NIR spectra exhibited ten absorption bands centred at 407, 444, 452, 489, 522, 552, 653, 800, 976 and 1532 nm. Absorption spectra of TiO2 NPs manifested two plasmon bands at 552 (transverse mode) and 580 nm (longitudinal mode). PL spectra demonstrated three prominent bands centred at 525, 545 and 660 nm, which are allocated to the Er3+ ion transition from the excited levels (2H11/2, 4S3/2 and 4F9/2) to the ground level (4I15/2). Furthermore, glass containing 0.2 mol% of TiO2 NPs revealed PL intensity enhancement by a factor of 30.00, 28.57 (for green bands) and 19.60 (for red band). This observation is ascribed to the SPR effect of TiO2 NPs which created strong local electric field in the vicinity of Er3+ ion. Green emission showed the highest enhancement due to its appearance in the immediate proximity of plasmon band. It is asserted that the incorporation of TiO2 NPs in the glass produced plasmonic effect and thereby altered the UV-Vis-NIR absorbance and improved the emission intensity of the samples. A correlation between SPR effect and surface enhance Raman scattering (SERS) is established. Present functional glass composition may be useful for device applications especially in photovoltaic and solid state laser. 2016-07 Thesis http://eprints.utm.my/id/eprint/78942/ http://eprints.utm.my/id/eprint/78942/1/NurNabihahYusofMFS2016.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:109642 phd doctoral Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QC Physics
spellingShingle	QC Physics Yusof, Nur Nabihah Titanium dioxide nanoparticles mediated surface plasmon resonance assisted optical properties of erbium-doped tellurite glass
description	Low emission and absorption cross-section of rare earth (RE) ion doped tellurite glasses that limit them from making solid state lasers needs further improvement. Combination of metal nanoparticles (NPs) with RE ions in the glass is proven to be prospective for overcoming such limitations. Via tuneable surface plasmon resonance (SPR) of metal NPs, an alteration in the optical properties of such glasses is feasible. In this view, present thesis takes an attempt to determine the mechanism of metal NPs SPR mediated modification in the optical properties of Erbium (Er3+) ions by embedding Titanium dioxide (TiO2) NPs into the tellurite glass. Five glass samples are prepared using melt-quenching technique with the composition (69-x)TeO2-20ZnO-10Na2O-1Er2O3-xTiO2, where x = 0.1, 0.2, 0.3, 0.4 mol%. Prepared samples are thoroughly characterized using X-ray diffraction (XRD), transmission electron microscope (TEM), energy dispersive X-ray (EDX), Fourier transform infrared (FTIR), Raman, ultraviolet-visible-near infrared (UV-Vis-NIR) and photoluminescence (PL) measurements. XRD pattern of achieved transparent glass samples confirmed their amorphous nature and TEM images revealed the existence of TiO2 NPs with average size between 16 to 22 nm. EDX spectra displayed the presence of Ti element in the sample together with other appropriate elemental traces. FTIR and Raman spectra showed different vibration modes of Te-O bond (bending, asymmetric and symmetric stretching) in the structural unit of TeO4 and TeO3. Glass containing 0.4 mol% of TiO2 NPs displayed an enhancement in the Raman signal by a factor of 1.56 to 3.58 for the bands centered at 388, 495, 673, 758 and 845 cm-1. This intensity enhancement is mainly attributed to the TiO2 NPs SPR assisted effects. Meanwhile, UV-Vis-NIR spectra exhibited ten absorption bands centred at 407, 444, 452, 489, 522, 552, 653, 800, 976 and 1532 nm. Absorption spectra of TiO2 NPs manifested two plasmon bands at 552 (transverse mode) and 580 nm (longitudinal mode). PL spectra demonstrated three prominent bands centred at 525, 545 and 660 nm, which are allocated to the Er3+ ion transition from the excited levels (2H11/2, 4S3/2 and 4F9/2) to the ground level (4I15/2). Furthermore, glass containing 0.2 mol% of TiO2 NPs revealed PL intensity enhancement by a factor of 30.00, 28.57 (for green bands) and 19.60 (for red band). This observation is ascribed to the SPR effect of TiO2 NPs which created strong local electric field in the vicinity of Er3+ ion. Green emission showed the highest enhancement due to its appearance in the immediate proximity of plasmon band. It is asserted that the incorporation of TiO2 NPs in the glass produced plasmonic effect and thereby altered the UV-Vis-NIR absorbance and improved the emission intensity of the samples. A correlation between SPR effect and surface enhance Raman scattering (SERS) is established. Present functional glass composition may be useful for device applications especially in photovoltaic and solid state laser.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Yusof, Nur Nabihah
author_facet	Yusof, Nur Nabihah
author_sort	Yusof, Nur Nabihah
title	Titanium dioxide nanoparticles mediated surface plasmon resonance assisted optical properties of erbium-doped tellurite glass
title_short	Titanium dioxide nanoparticles mediated surface plasmon resonance assisted optical properties of erbium-doped tellurite glass
title_full	Titanium dioxide nanoparticles mediated surface plasmon resonance assisted optical properties of erbium-doped tellurite glass
title_fullStr	Titanium dioxide nanoparticles mediated surface plasmon resonance assisted optical properties of erbium-doped tellurite glass
title_full_unstemmed	Titanium dioxide nanoparticles mediated surface plasmon resonance assisted optical properties of erbium-doped tellurite glass
title_sort	titanium dioxide nanoparticles mediated surface plasmon resonance assisted optical properties of erbium-doped tellurite glass
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2016
url	http://eprints.utm.my/id/eprint/78942/1/NurNabihahYusofMFS2016.pdf
_version_	1747818109298802688

Titanium dioxide nanoparticles mediated surface plasmon resonance assisted optical properties of erbium-doped tellurite glass

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