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Gold nanoparticles assisted structural and spectroscopic modification in Er3+-doped zinc sodium tellurite glass

Achieving enhanced spectroscopic properties of rare earth doped inorganic glasses by embedding metallic nanoparticles of controlled sizes is a challenging task. We report the gold (Au) NPs assisted modifications in structural and spectroscopic properties of melt-quench synthesized Er3+ doped zinc so...

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Main Authors: Awang, Asmahani, Ghoshal, Sib Krishna, Sahar, Md. Rahim, Arifin, Ramli
Format: Article
Published: Elsevier 2015
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QC Physics
Online Access:http://eprints.utm.my/id/eprint/55489/
http://dx.doi.org/10.1016/j.optmat.2015.02.009
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spelling my.utm.554892017-02-15T04:49:05Z http://eprints.utm.my/id/eprint/55489/ Gold nanoparticles assisted structural and spectroscopic modification in Er3+-doped zinc sodium tellurite glass Awang, Asmahani Ghoshal, Sib Krishna Sahar, Md. Rahim Arifin, Ramli QC Physics Achieving enhanced spectroscopic properties of rare earth doped inorganic glasses by embedding metallic nanoparticles of controlled sizes is a challenging task. We report the gold (Au) NPs assisted modifications in structural and spectroscopic properties of melt-quench synthesized Er3+ doped zinc sodium tellurite glass. The growth of NPs is stimulated via time varying heat treatment at 300 °C. XRD patterns confirm the amorphous nature of glasses and TEM images manifest the growth of gold NPs with sizes between 6.1 and 10.7 nm. The heat treatment time dependent variations in physical properties are ascribed to the alteration in bonding of non-bridging oxygen ions. The UV-VIS-NIR spectra reveal six absorption peaks centered at 488, 523, 655, 800, 973 and 1533 nm corresponding to the transition from ground state of 4I15/2 to 4F7/2, 2H11/2, 4F9/2, 4I9/2, 4I11/2, and 4I13/2 excited states of Er3+ ions, respectively. Surface plasmon resonance (SPR) bands are observed in the range of 618-632 nm. Judd-Ofelt analyses demonstrate a significant increase of spectroscopic quality factors (0.86-1.05) and branching ratio (0.62-92.38%). The up-conversion emission spectra of Er3+ exhibit three prominent peaks of reasonable green (502 nm), a moderate green (546 nm) and a strong red (629 nm). An enhancement in the red band luminescence intensity by a factor of 8.19 and 8.54 times are achieved for 2 and 4 h of heat treatments, respectively. This enhancement is attributed to the SPR effects of gold NPs producing an intense local field in the proximity of Er3+ ions and subsequent energy transfer between RE ions and NPs. The FTIR spectra display the presence of vibrational modes for ZnO4 bonds, Te-O bond in TeO3 (tp) and TeO4 (tbp) units and the hydroxyl groups. Excellent features of the results suggest that our method constitute a basis for tunable growth of gold NPs which is exceedingly useful for the optimization of optical and structural properties Elsevier 2015-04 Article PeerReviewed Awang, Asmahani and Ghoshal, Sib Krishna and Sahar, Md. Rahim and Arifin, Ramli (2015) Gold nanoparticles assisted structural and spectroscopic modification in Er3+-doped zinc sodium tellurite glass. Optical Materials, 42 . pp. 495-505. ISSN 0925-3467 http://dx.doi.org/10.1016/j.optmat.2015.02.009 DOI:10.1016/j.optmat.2015.02.009
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
topic QC Physics
spellingShingle QC Physics
Awang, Asmahani
Ghoshal, Sib Krishna
Sahar, Md. Rahim
Arifin, Ramli
Gold nanoparticles assisted structural and spectroscopic modification in Er3+-doped zinc sodium tellurite glass
description Achieving enhanced spectroscopic properties of rare earth doped inorganic glasses by embedding metallic nanoparticles of controlled sizes is a challenging task. We report the gold (Au) NPs assisted modifications in structural and spectroscopic properties of melt-quench synthesized Er3+ doped zinc sodium tellurite glass. The growth of NPs is stimulated via time varying heat treatment at 300 °C. XRD patterns confirm the amorphous nature of glasses and TEM images manifest the growth of gold NPs with sizes between 6.1 and 10.7 nm. The heat treatment time dependent variations in physical properties are ascribed to the alteration in bonding of non-bridging oxygen ions. The UV-VIS-NIR spectra reveal six absorption peaks centered at 488, 523, 655, 800, 973 and 1533 nm corresponding to the transition from ground state of 4I15/2 to 4F7/2, 2H11/2, 4F9/2, 4I9/2, 4I11/2, and 4I13/2 excited states of Er3+ ions, respectively. Surface plasmon resonance (SPR) bands are observed in the range of 618-632 nm. Judd-Ofelt analyses demonstrate a significant increase of spectroscopic quality factors (0.86-1.05) and branching ratio (0.62-92.38%). The up-conversion emission spectra of Er3+ exhibit three prominent peaks of reasonable green (502 nm), a moderate green (546 nm) and a strong red (629 nm). An enhancement in the red band luminescence intensity by a factor of 8.19 and 8.54 times are achieved for 2 and 4 h of heat treatments, respectively. This enhancement is attributed to the SPR effects of gold NPs producing an intense local field in the proximity of Er3+ ions and subsequent energy transfer between RE ions and NPs. The FTIR spectra display the presence of vibrational modes for ZnO4 bonds, Te-O bond in TeO3 (tp) and TeO4 (tbp) units and the hydroxyl groups. Excellent features of the results suggest that our method constitute a basis for tunable growth of gold NPs which is exceedingly useful for the optimization of optical and structural properties
format Article
author Awang, Asmahani
Ghoshal, Sib Krishna
Sahar, Md. Rahim
Arifin, Ramli
author_facet Awang, Asmahani
Ghoshal, Sib Krishna
Sahar, Md. Rahim
Arifin, Ramli
author_sort Awang, Asmahani
title Gold nanoparticles assisted structural and spectroscopic modification in Er3+-doped zinc sodium tellurite glass
title_short Gold nanoparticles assisted structural and spectroscopic modification in Er3+-doped zinc sodium tellurite glass
title_full Gold nanoparticles assisted structural and spectroscopic modification in Er3+-doped zinc sodium tellurite glass
title_fullStr Gold nanoparticles assisted structural and spectroscopic modification in Er3+-doped zinc sodium tellurite glass
title_full_unstemmed Gold nanoparticles assisted structural and spectroscopic modification in Er3+-doped zinc sodium tellurite glass
title_sort gold nanoparticles assisted structural and spectroscopic modification in er3+-doped zinc sodium tellurite glass
publisher Elsevier
publishDate 2015
url http://eprints.utm.my/id/eprint/55489/
http://dx.doi.org/10.1016/j.optmat.2015.02.009
_version_ 1643653813088813056
score 13.211869

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