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  Gradient in defect density of ZnO nanorods grown by cathodic delamination, a corrosion process, leads to end-specific luminescence

Iqbal, D., Sarfraz, A., & Erbe, A. (2018). Gradient in defect density of ZnO nanorods grown by cathodic delamination, a corrosion process, leads to end-specific luminescence. Nanoscale Horizons, 3(1), 58-65. doi:10.1039/c7nh00111h.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-24EC-E Version Permalink: http://hdl.handle.net/21.11116/0000-0000-24ED-D
Genre: Journal Article

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 Creators:
Iqbal, Danish1, Author              
Sarfraz, Adnan1, Author              
Erbe, Andreas1, 2, Author              
Affiliations:
1Interface Spectroscopy, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863358              
2Department of Materials Science and Engineering, NTNU - Norwegian University of Science and Technology, 7491 Trondheim, Norway, ou_persistent22              

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Free keywords: VISIBLE-LIGHT PHOTOCATALYSIS; ZINC-OXIDE; ELECTRICAL-PROPERTIES; MECHANISTIC APPROACH; POLYMERIC COATINGS; HIGH-PERFORMANCE; NANOWIRES; ARRAYS; PHOTOLUMINESCENCE; TEMPERATUREChemistry; Science & Technology - Other Topics; Materials Science;
 Abstract: ZnO nanorods were grown on a zinc substrate via cathodic delamination of a polymer coating, a tailored corrosion process, at room temperature. A comparison between in situ Raman spectra and post mortem cross sectional analysis by Raman spectroscopy, photoluminescence spectroscopy and scanning electron microscopy shows that in the initial stages of the synthesis, preferentially defect rich ZnO grows. At later stages, crystalline wurtzite ZnO growth dominates. The result is nanorod arrays consisting of nanorods with a large density of point defects in the approximate to 500 nmrange near the zinc substrate, and low defect density in the regions further away from the interface. The growth, which proceeds over several hours, can be interrupted at any time. Large salt concentrations in the corrosive medium increase the growth rate, but also the amount of point defects. The resulting rods show strongly position-dependent luminescence and Raman spectra. Different luminescence can thus be selectively excited, based on the position of excitation.

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Language(s): eng - English
 Dates: 2018-01
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: ISI: 000418196800006
DOI: 10.1039/c7nh00111h
 Degree: -

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Title: Nanoscale Horizons
Source Genre: Journal
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Publ. Info: Cambridge, England : Royal Society of Chemistry
Pages: - Volume / Issue: 3 (1) Sequence Number: - Start / End Page: 58 - 65 Identifier: ISSN: 2055-6756
CoNE: /journals/resource/2055-6756