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Morphological driven photocatalytic activity of ZnO nanostructures

Using a simple combination of pulse laser ablation in liquid and hydrothermal (PLAL-H) approaches, we control the morphology of ZnO nanostructures (ZNSs) to determine the feasibility of their photocatalytic efficacy. These ZNSs are deposited on Si (100) substrates and two different morphologies are...

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Main Authors: Abbas, K. N., Bidin, N.
Format: Article
Published: Elsevier B. V 2017
Subjects:
QC Physics
Online Access:http://eprints.utm.my/id/eprint/80379/
http://dx.doi.org//10.1016/j.apsusc.2016.10.080
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spelling my.utm.803792019-05-10T07:18:13Z http://eprints.utm.my/id/eprint/80379/ Morphological driven photocatalytic activity of ZnO nanostructures Abbas, K. N. Bidin, N. QC Physics Using a simple combination of pulse laser ablation in liquid and hydrothermal (PLAL-H) approaches, we control the morphology of ZnO nanostructures (ZNSs) to determine the feasibility of their photocatalytic efficacy. These ZNSs are deposited on Si (100) substrates and two different morphologies are achieved. In this synergistic approach, PLAL synthesized NSs are used as a nutrient solution with different pH for further hydrothermal treatment at 110 °C under varying growth time (5, 30 and 60 min). Surface morphology, structure, composition, and optical characteristics of the prepared ZNSs are determined using FESEM, XRD, FTIR and Photoluminescence (PL) and UV–vis absorption measurements. The morphology revealed remarkable transformation from nanorods (NRs)/nanoflowers (NFs) (at pH 7.6) to nanoparticles (NPs)-like (at pH 10.5) structure. XRD patterns showed better polycrystallinity for NPs with enlarged band gap than NR/NF-like structures. Both PL and UV–vis spectral analysis of ZNPs exhibited higher surface area and deep level defects density dependent morphology, where the nutrient pH and growth time variation are found to play a significant role towards structural evolution. Furthermore, the photocatalytic activities of, such ZNSs are evaluated via sunlight driven photo-degradation of methylene blue (MB) dye. The photocatalytic efficiency of ZNPs is demonstrated to be much superior (97.4%) than ZNRs/ZNFs-like morphology (86%). Such enhanced photocatalytic activities of as-synthesized ZNPs is attributed to the synergism of the improved surface area and defects density, which is useful for promoting the adsorption of the MB dye and suppressed surface recombination of photo-generated charge carriers. Elsevier B. V 2017 Article PeerReviewed Abbas, K. N. and Bidin, N. (2017) Morphological driven photocatalytic activity of ZnO nanostructures. Applied Surface Science, 394 . pp. 498-508. ISSN 0169-4332 http://dx.doi.org//10.1016/j.apsusc.2016.10.080 DOI:/10.1016/j.apsusc.2016.10.080
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
Abbas, K. N.
Bidin, N.
Morphological driven photocatalytic activity of ZnO nanostructures
description Using a simple combination of pulse laser ablation in liquid and hydrothermal (PLAL-H) approaches, we control the morphology of ZnO nanostructures (ZNSs) to determine the feasibility of their photocatalytic efficacy. These ZNSs are deposited on Si (100) substrates and two different morphologies are achieved. In this synergistic approach, PLAL synthesized NSs are used as a nutrient solution with different pH for further hydrothermal treatment at 110 °C under varying growth time (5, 30 and 60 min). Surface morphology, structure, composition, and optical characteristics of the prepared ZNSs are determined using FESEM, XRD, FTIR and Photoluminescence (PL) and UV–vis absorption measurements. The morphology revealed remarkable transformation from nanorods (NRs)/nanoflowers (NFs) (at pH 7.6) to nanoparticles (NPs)-like (at pH 10.5) structure. XRD patterns showed better polycrystallinity for NPs with enlarged band gap than NR/NF-like structures. Both PL and UV–vis spectral analysis of ZNPs exhibited higher surface area and deep level defects density dependent morphology, where the nutrient pH and growth time variation are found to play a significant role towards structural evolution. Furthermore, the photocatalytic activities of, such ZNSs are evaluated via sunlight driven photo-degradation of methylene blue (MB) dye. The photocatalytic efficiency of ZNPs is demonstrated to be much superior (97.4%) than ZNRs/ZNFs-like morphology (86%). Such enhanced photocatalytic activities of as-synthesized ZNPs is attributed to the synergism of the improved surface area and defects density, which is useful for promoting the adsorption of the MB dye and suppressed surface recombination of photo-generated charge carriers.
format Article
author Abbas, K. N.
Bidin, N.
author_facet Abbas, K. N.
Bidin, N.
author_sort Abbas, K. N.
title Morphological driven photocatalytic activity of ZnO nanostructures
title_short Morphological driven photocatalytic activity of ZnO nanostructures
title_full Morphological driven photocatalytic activity of ZnO nanostructures
title_fullStr Morphological driven photocatalytic activity of ZnO nanostructures
title_full_unstemmed Morphological driven photocatalytic activity of ZnO nanostructures
title_sort morphological driven photocatalytic activity of zno nanostructures
publisher Elsevier B. V
publishDate 2017
url http://eprints.utm.my/id/eprint/80379/
http://dx.doi.org//10.1016/j.apsusc.2016.10.080
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score 13.211869

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