The use of pulsed laser deposited seed layers for the aqueous solution growth of highly oriented ZnO nanowires on sapphire substrates at 95°C: Study of their photocatalytic activity in terms of octadecanoic (stearic) acid degradation

Kenanakis, George; Pervolaraki, M.; Giapintzakis, J.; Katsarakis, N.

doi:10.1016/j.apcata.2013.07.040

Cited by 8 publications

(5 citation statements)

References 63 publications

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“…After rinsing several times with ethanol and bidistilled water in order to remove any remains, the surfaces were coated by a ZnO film using a simple sol–gel process. − For this purpose, Zinc acetate dihydrate [(Zn(CH 2 COO) 2 ·2H 2 O), Sigma-Aldrich, 99.99%] was dissolved in 2-methoxy ethanol [(CH 3 OCH 2 CH 2 OH), Sigma-Aldrich, ≥99.55%] at a concentration of 0.75 mol/L. Monoethanolamine [(HOCH 2 CH 2 NH 2 ), Sigma-Aldrich, ≥99.0%] was also added as a stabilizer and the molar ratio of zinc acetate to ethanolamine was kept at 1:1.…”

Section: Methodsmentioning

confidence: 99%

“…These are prepared following a two-step fabrication process. First, silicon (Si) wafers are irradiated with femtosecond (fs) laser pulses in order to produce Si surfaces with dual scale roughness (Si spikes). ,, Then, the rough Si samples are coated with a ZnO film prepared by a simple sol–gel process. − The artificial surfaces exhibit reversible wettability from superhydrophilic (upon UV irradiation) to superhydrophobic (upon heating), while the as-grown samples revealed high photocatalytic activity investigated by means of the decolorization of methylene blue as a model dye. The reproducibility and sustainability of the system is thoroughly studied.…”

Section: Introductionmentioning

confidence: 99%

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Functional Surfaces with Photocatalytic Behavior and Reversible Wettability: ZnO Coating on Silicon Spikes

et al. 2015

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Multifunctional surfaces with reversible characteristics have gained great attention due to their various envisioned applications. We report on the development of surfaces exhibiting both photocatalytic activity and reversible wettability. Initially, irradiation of silicon wafers with femtosecond laser pulses produces a surface with dual-scale roughness in the micro-and nanoscale. Subsequently, the hierarchically roughened silicon surfaces are coated with ZnO following a simple sol− gel process. The manufactured artificial surfaces exhibit reversible wettability from superhydrophilic (upon UV irradiation) to superhydrophobic (upon heating), while the specimens reveal high photocatalytic activity as illustrated by the decolorization of methylene blue utilized as a model dye. The surfaces exhibit reproducibility and stability over a number of cycles.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Functional Surfaces with Photocatalytic Behavior and Reversible Wettability: ZnO Coating on Silicon Spikes

et al. 2015

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“…The surface morphology plays an important role by modifying the electronic and optical properties of a semiconductor with enhancement of its harvesting capacity [6]. A variety of morphologies such as nanoparticles [7], nanotubes [8], nanowires [9] nanostructures [10] and nanoporous structures [11] have been reported to improve the photocatalytic activity of semiconductors. Among the semiconductors and metal oxides, ZnO has been selected for the ease of forming various types of nanostructured morphologies.…”

Section: Introductionmentioning

confidence: 99%

Growth and Characterization of Nanostructured Ag-ZnO for Application in Water Purification

Barnasas

Karavasilis

Aggelopoulos

et al. 2020

JNanoR

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In this work, a low-cost method to produce ZnO nanostructured materials for the treatment of water polluted with model organic pollutants (e.g. dyes) is presented. Zinc and silver-coated Zn (Ag/Zn) films, fabricated via sputtering method were naturally oxidized via a simple, low-temperature, scalable thermal process. During oxidation, Ag/ZnO nanorods were grown on Zn foils after treating their surface with various agents (e.g. acids) and annealing in an oven at temperatures 385-400 °C. The ZnO and Ag/ZnO films on Zn were characterized by X-ray diffraction, scanning electron microscopy and photoluminescence spectroscopy. The cationic dye Methylene Blue (MB) was selected as model pollutant dissolved in water, and a batch photo-reactor was fabricated and used to to study the adsorption capacity and photocatalytic performance of films. The transient varation of MB concentration in aqueous solutions was measured with UV-Vis spectroscopy. Ag/ZnO demonstrated a strong MB adsorbion capacity in dark conditions, and a satisfactory MB photocatalytic degradation under UV light irradiation.The optimized doping of Ag in Ag/ZnO film enhanced its photocatalytic activity, and seems well-promising for the potential scale-up of Ag/ZnO films, and use in large-scale systems for water purification under UV light irradiation.

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“…The ZnO nanorods are deemed to be more efficient thanks to the comparatively higher surface area. The performance of ZnO nanorods, however, has been reported to be better or worse than the thin film prepared from various methods [20][21][22][23][24]. In the case where the thin film was more active, it was attributed to the higher surface-to-volume ratio and better (002) orientation [21].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic performances of ZnO nanoparticle film and vertically aligned nanorods in chamber-based microfluidic reactors: Reaction kinetics and flow effects

Zhao

Ning

Wen

et al. 2017

Applied Catalysis B: Environmental

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The nanoparticle seed layer (a film) and vertically aligned nanorods of zinc oxide (ZnO) with different lengths were fabricated within a novel chamber-based microfluidic (microchamber) reactor with a varying height of 0.127-5mm and characterized with their microstructures, photocatalytic performances as well as qualitative reaction kinetics. The ZnO seed layer was produced by a sol-gel procedure and the nanorods were hydrothermally grown on seed layer coated glass substrates. These ZnO samples were integrated into the microchamber reactor through a seven-layer sandwiched configuration. The aqueous methyl orange (MO) solution was chosen as a model polluted water. By comparing the ultraviolet-visible (UV-Visible) absorbance of the original MO solution and the post-treatment sample, the reaction constants were calculated, representing the efficiencies of the reactors. The ZnO samples, usually possessing a large amount of defects, with a higher crystal quality showed an enhanced activity. The reaction constant was featured of a plateau with accelerating flow rates, exhibited an exponentially decreasing function of the chamber height, and declined with increasing the initial concentration of the MO solution. The efficiency of the microchamber reactor was found to be one to two orders of magnitude higher than that of a batch reactor. The rate determining step was suggested to be the mass transport related adsorption of MO on ZnO. The measured reaction properties and the reactor design should be of considerable significance to the scaling-up and optimization of microchamber catalytic reactors dedicated to water purification and other applications.

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The use of pulsed laser deposited seed layers for the aqueous solution growth of highly oriented ZnO nanowires on sapphire substrates at 95°C: Study of their photocatalytic activity in terms of octadecanoic (stearic) acid degradation

Cited by 8 publications

References 63 publications

Functional Surfaces with Photocatalytic Behavior and Reversible Wettability: ZnO Coating on Silicon Spikes

Functional Surfaces with Photocatalytic Behavior and Reversible Wettability: ZnO Coating on Silicon Spikes

Growth and Characterization of Nanostructured Ag-ZnO for Application in Water Purification

Photocatalytic performances of ZnO nanoparticle film and vertically aligned nanorods in chamber-based microfluidic reactors: Reaction kinetics and flow effects

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