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Engineering Charge Transfer Characteristics in Hierarchical Cu(2)S QDs @ ZnO Nanoneedles with p–n Heterojunctions: Towards Highly Efficient and Recyclable Photocatalysts
Equipped with staggered gap p-n heterojunctions, a new paradigm of photocatalysts based on hierarchically structured nano-match-shaped heterojunctions (NMSHs) Cu(2)S quantum dots (QDs)@ZnO nanoneedles (NNs) are successfully developed via engineering the successive ionic layer adsorption and reaction...
Autores principales: | , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6359091/ https://www.ncbi.nlm.nih.gov/pubmed/30583591 http://dx.doi.org/10.3390/nano9010016 |
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author | Han, Donglai Li, Boxun Yang, Shuo Wang, Xinying Gao, Wei Si, Zhenjun Zuo, Qinghui Li, Yanhui Li, Yanwei Duan, Qian Wang, Dandan |
author_facet | Han, Donglai Li, Boxun Yang, Shuo Wang, Xinying Gao, Wei Si, Zhenjun Zuo, Qinghui Li, Yanhui Li, Yanwei Duan, Qian Wang, Dandan |
author_sort | Han, Donglai |
collection | PubMed |
description | Equipped with staggered gap p-n heterojunctions, a new paradigm of photocatalysts based on hierarchically structured nano-match-shaped heterojunctions (NMSHs) Cu(2)S quantum dots (QDs)@ZnO nanoneedles (NNs) are successfully developed via engineering the successive ionic layer adsorption and reaction (SILAR). Under UV and visible light illumination, the photocatalytic characteristics of Cu(2)S@ZnO heterojunctions with different loading amounts of Cu(2)S QDs are evaluated by the corresponding photocatalytic degradation of rhodamine B (RhB) aqueous solution. The results elaborate that the optimized samples (S3 serial specimens with six cycles of SILAR reaction) by means of tailored the band diagram exhibit appreciable improvement of photocatalytic activities among all synthesized samples, attributing to the sensitization of a proper amount of Cu(2)S QDs. Such developed architecture not only could form p–n junctions with ZnO nanoneedles to facilitate the separation of photo-generated carries but also interact with the surface defects of ZnO NNs to reduce the electron and hole recombination probability. Moreover, the existence of Cu(2)S QDs could also extend the light absorption to improve the utilization rate of sunlight. Importantly, under UV light S3 samples demonstrate the remarkably enhanced RhB degradation efficiency, which is clearly testified upon the charge transfer mechanism discussions and evaluations in the present work. Further supplementary investigations illustrate that the developed nanoscale Cu(2)S@ZnO heterostructures also possess an excellent photo-stability during our extensive recycling photocatalytic experiments, promising for a wide range of highly efficient and sustainably recyclable photocatalysts applications. |
format | Online Article Text |
id | pubmed-6359091 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-63590912019-02-06 Engineering Charge Transfer Characteristics in Hierarchical Cu(2)S QDs @ ZnO Nanoneedles with p–n Heterojunctions: Towards Highly Efficient and Recyclable Photocatalysts Han, Donglai Li, Boxun Yang, Shuo Wang, Xinying Gao, Wei Si, Zhenjun Zuo, Qinghui Li, Yanhui Li, Yanwei Duan, Qian Wang, Dandan Nanomaterials (Basel) Article Equipped with staggered gap p-n heterojunctions, a new paradigm of photocatalysts based on hierarchically structured nano-match-shaped heterojunctions (NMSHs) Cu(2)S quantum dots (QDs)@ZnO nanoneedles (NNs) are successfully developed via engineering the successive ionic layer adsorption and reaction (SILAR). Under UV and visible light illumination, the photocatalytic characteristics of Cu(2)S@ZnO heterojunctions with different loading amounts of Cu(2)S QDs are evaluated by the corresponding photocatalytic degradation of rhodamine B (RhB) aqueous solution. The results elaborate that the optimized samples (S3 serial specimens with six cycles of SILAR reaction) by means of tailored the band diagram exhibit appreciable improvement of photocatalytic activities among all synthesized samples, attributing to the sensitization of a proper amount of Cu(2)S QDs. Such developed architecture not only could form p–n junctions with ZnO nanoneedles to facilitate the separation of photo-generated carries but also interact with the surface defects of ZnO NNs to reduce the electron and hole recombination probability. Moreover, the existence of Cu(2)S QDs could also extend the light absorption to improve the utilization rate of sunlight. Importantly, under UV light S3 samples demonstrate the remarkably enhanced RhB degradation efficiency, which is clearly testified upon the charge transfer mechanism discussions and evaluations in the present work. Further supplementary investigations illustrate that the developed nanoscale Cu(2)S@ZnO heterostructures also possess an excellent photo-stability during our extensive recycling photocatalytic experiments, promising for a wide range of highly efficient and sustainably recyclable photocatalysts applications. MDPI 2018-12-23 /pmc/articles/PMC6359091/ /pubmed/30583591 http://dx.doi.org/10.3390/nano9010016 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Han, Donglai Li, Boxun Yang, Shuo Wang, Xinying Gao, Wei Si, Zhenjun Zuo, Qinghui Li, Yanhui Li, Yanwei Duan, Qian Wang, Dandan Engineering Charge Transfer Characteristics in Hierarchical Cu(2)S QDs @ ZnO Nanoneedles with p–n Heterojunctions: Towards Highly Efficient and Recyclable Photocatalysts |
title | Engineering Charge Transfer Characteristics in Hierarchical Cu(2)S QDs @ ZnO Nanoneedles with p–n Heterojunctions: Towards Highly Efficient and Recyclable Photocatalysts |
title_full | Engineering Charge Transfer Characteristics in Hierarchical Cu(2)S QDs @ ZnO Nanoneedles with p–n Heterojunctions: Towards Highly Efficient and Recyclable Photocatalysts |
title_fullStr | Engineering Charge Transfer Characteristics in Hierarchical Cu(2)S QDs @ ZnO Nanoneedles with p–n Heterojunctions: Towards Highly Efficient and Recyclable Photocatalysts |
title_full_unstemmed | Engineering Charge Transfer Characteristics in Hierarchical Cu(2)S QDs @ ZnO Nanoneedles with p–n Heterojunctions: Towards Highly Efficient and Recyclable Photocatalysts |
title_short | Engineering Charge Transfer Characteristics in Hierarchical Cu(2)S QDs @ ZnO Nanoneedles with p–n Heterojunctions: Towards Highly Efficient and Recyclable Photocatalysts |
title_sort | engineering charge transfer characteristics in hierarchical cu(2)s qds @ zno nanoneedles with p–n heterojunctions: towards highly efficient and recyclable photocatalysts |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6359091/ https://www.ncbi.nlm.nih.gov/pubmed/30583591 http://dx.doi.org/10.3390/nano9010016 |
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