Article (Scientific journals)
Improved Photoactivity Of NiO/ZnO Nanorods Heterostructured Films Relying On Scaffold Surface Cleaning And NiO Deposition Time Optimization
Periyannan, Shanmugapriya; Manceriu, Laura; Klein, Andreas et al.
2023In ChemPhotoChem, 7 (5)
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Keywords :
Interfaces; nanostructures; photocatalysis; photoelectron spectroscopy; surface cleaning; thin films; Annealing; Carrier concentration; Charge transfer; Deposition; Efficiency; II-VI semiconductors; Image enhancement; Nanorods; Nickel oxide; Oxygen; Photocatalytic activity; Photoelectron spectroscopy; Scaffolds; Semiconductor doping; Zinc oxide; Band bendings; Charge transfer resistance; Deposition time; High vacuum; Oxide deposition; Photo-activities; Photocatalytic efficiency; Photoresponses; Thin-films; Zinc oxide nanorods; Thin films
Abstract :
[en] Herein, a surface cleaning procedure involving vacuum annealing under oxygen was applied for cleaning the zinc oxide nanorod (ZNR) scaffold film's surface before nickel oxide (NiO) deposition for heterostructure formation. The scaffold properties (surface stoichiometry, defects fluctuation, Fermi level shift, carrier concentration) were studied as a function of the vacuum level and the NiO deposition time and correlated to the NiO/ZNR interface (charge transfer resistance, band bending) and photo-response properties. The surface cleaning under a higher vacuum enabled the adsorbate and surface oxygen vacancy passivation but also influenced the surface doping. Our best performing NiO/ZNR interface in terms of photocatalytic efficiency was composed of a high-vacuum-cleaned (0.5 Pa) ZNR scaffold and 40 s sputter deposited NiO layer which was post-annealed. The high photocatalytic efficiency could be correlated with a maximized near-band edge emission, effective band bending, low charge transfer resistance (as proven by photoelectrochemical impedance measurements), and optimum light harvesting (maximized photocurrent density). The optimized NiO/ZNR showed about 1.5 times increase in photo-response and improved photodegradation efficiency compared to the ZNR scaffold. © 2023 Wiley-VCH GmbH.
Disciplines :
Chemistry
Physics
Author, co-author :
Periyannan, Shanmugapriya ;  Université de Liège - ULiège > Département de chimie (sciences) > GREEnMat ; Surface Science Division, Institute of Materials Science, Technische Universität Darmstadt, Otto-Berndt-Straße 3, Darmstadt, 64287, Germany
Manceriu, Laura  ;  Université de Liège - ULiège > Département de chimie (sciences) > GREEnMat
Klein, Andreas;  Surface Science Division, Institute of Materials Science, Technische Universität Darmstadt, Otto-Berndt-Straße 3, Darmstadt, 64287, Germany
Jaegermann, Wolfram;  Surface Science Division, Institute of Materials Science, Technische Universität Darmstadt, Otto-Berndt-Straße 3, Darmstadt, 64287, Germany
Henrist, Catherine ;  Université de Liège - ULiège > Département de chimie (sciences)
Cloots, Rudi ;  Université de Liège - ULiège > Département de chimie (sciences) > GREEnMat
Language :
English
Title :
Improved Photoactivity Of NiO/ZnO Nanorods Heterostructured Films Relying On Scaffold Surface Cleaning And NiO Deposition Time Optimization
Publication date :
2023
Journal title :
ChemPhotoChem
eISSN :
2367-0932
Publisher :
John Wiley and Sons Inc
Volume :
7
Issue :
5
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 24 September 2025

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