Effect of surface and defect chemistry on the photo-catalytic properties of intentionally defect-rich ZnO nanorod arrays

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dc.contributor.author Kegel, Jan
dc.contributor.author Zubialevich, Vitaly Z.
dc.contributor.author Schmidt, Michael
dc.contributor.author Povey, Ian M.
dc.contributor.author Pemble, Martyn E.
dc.date.accessioned 2018-05-16T11:31:46Z
dc.date.available 2018-05-16T11:31:46Z
dc.date.issued 2018-05-08
dc.identifier.citation Kegel, J., Zubialevich, V. Z., Schmidt, M., Povey, I. M. and Pemble, M. E. (2018) 'Effect of surface and defect chemistry on the photo-catalytic properties of intentionally defect-rich ZnO nanorod arrays', ACS Applied Materials and Interfaces. doi:10.1021/acsami.8b05130 en
dc.identifier.issn 1944-8244
dc.identifier.issn 1944-8252
dc.identifier.uri http://hdl.handle.net/10468/6123
dc.identifier.doi 10.1021/acsami.8b05130
dc.description.abstract Due to the abundance of intrinsic defects in zinc oxide (ZnO) the material properties are often governed by same. Knowledge of the defect chemistry has proven to be highly important, especially in terms of the photo-catalytic degradation of pollutants. Given the fact that defect-free materials or structures exhibiting only one type of defect are extremely difficult to produce, it is necessary to evaluate what influence various defects may have when present together in the material. In this study, intentionally defect-rich ZnO nanorod (NR) arrays are grown using a simple low-temperature solution-based growth technique. Upon changing the defect chemistry using rapid thermal annealing (RTA) the material properties are carefully assessed and correlated to the resulting photo-catalytic properties. Special focus is put on the investigation of these properties for samples showing strong orange photoluminescence (PL). It is shown that intense orange emitting NR arrays exhibit improved dye-degradation rates under UV-light irradiation. Furthermore strong dye-adsorption has been observed for some samples. This behavior is found to stem from a graphitic surface structure (e.g. shell) formed during RTA in vacuum. Since orange-luminescent samples also exhibit an enhancement of the dye-adsorption a possible interplay and synergy of these two defects is elucidated. Additionally, evidence is presented suggesting that in annealed ZnO NRs structural defects may be responsible for the often observed PL emission at 3.31 eV. However, a clear correlation with the photo-catalytic properties could not be established for these defects. Building on the specific findings presented here, this study also presents some more general guidelines which it is suggested, should be employed when assessing the photo-catalytic properties of defect-rich ZnO. en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher American Chemical Society en
dc.rights © 2018, American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials and Interfaces after technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/abs/10.1021/acsami.8b05130 en
dc.subject ZnO en
dc.subject Defects en
dc.subject Photo-catalysis en
dc.subject Photo-luminescence en
dc.subject Defect-complex en
dc.subject Rapid thermal annealing en
dc.title Effect of surface and defect chemistry on the photo-catalytic properties of intentionally defect-rich ZnO nanorod arrays en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Martyn Pemble, Chemistry, University College Cork, Cork, Ireland. +353-21-490-3000 Email: martyn.pemble@tyndall.ie en
dc.internal.availability Full text available en
dc.check.info Access to this article is restricted until 12 months after publication by request of the publisher. en
dc.check.date 2019-05-08
dc.date.updated 2018-05-16T11:18:35Z
dc.description.version Accepted Version en
dc.internal.rssid 437869337
dc.contributor.funder Science Foundation Ireland en
dc.description.status Peer reviewed en
dc.identifier.journaltitle ACS Applied Materials and Interfaces en
dc.internal.copyrightchecked Yes en
dc.internal.licenseacceptance Yes en
dc.internal.IRISemailaddress martyn.pemble@tyndall.ie en
dc.internal.bibliocheck In Press. Check for vol. / issue / page numbers. Amend citation as necessary.
dc.relation.project info:eu-repo/grantAgreement/SFI/SFI US Ireland R&D Partnership/13/US/I2543/IE/Research into Emerging Nano-structured Electrodes for the splitting of Water (RENEW)/ en
dc.relation.project info:eu-repo/grantAgreement/SFI/SFI Investigator Programme/15/IA/3015/IE/Design, Deposition and Exploitation of Novel Micro and Nano-scale Materials and Devices for Advanced Manufacturing- DEPO-Man/ en

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