Photocatalyst ZnO nanorod arrays on glass substrates: the critical role of seed layer in nanorod alignment and photocatalytic efficiencies

Kardeş, Memnune; Öztürk, Koray

doi:10.1080/00986445.2019.1660651

Cited by 12 publications

(5 citation statements)

References 56 publications

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“…The ZnO nanomaterial obtained after calcination at 750 °C showed high activity with methylene blue (MB), the DE and rate constant reached 99% and 0.129 min −1 , respectively, at MB of 10 mg l −1 and 40 min [7]. Rod-like ZnO on thin film could degrade acid red 88, the DE over 80% in 200 min [8]. Rose-like ZnO could decompose caffeine (CAF) in water, at CAF of 5 mg l −1 and ZnO of 3 g l −1 , the DE in 120 min was 97.6% and the DE was over 80% after 4 cycles [9].…”

Section: Introductionmentioning

confidence: 99%

Preparation of carnation-like Ag-ZnO composites for enhanced photocatalysis under visible light

Mac

Nguyen

et al. 2023

Nanotechnology

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Carnation-like ZnO was synthesized by the facile precipitation method (at room temperature and in 120 min) to decompose dyes in an aqueous medium. The carnation-like ZnO had a stratified porous structure with a size of about 2-3 μm, its petals had a smooth surface with a thickness of 5-10 nm and a width of about 300-500 nm. Ag-ZnO composites were synthesized using glucose with the assistance of PVP. The morphology of Ag-ZnO composites was almost unchanged compared to ZnO. Where, the Ag nanoparticles in the size range of 5 to 15 nm were uniformly dispersed on the ZnO petals, improving the catalytic ability of the composites in tartrazine (TA) degradation. The influence of Ag content on catalytic structure and performance of composite was studied. The 5Ag-ZnO sample had the highest BET surface area and pore volume and the lowest gap energy (Eg) among the as-synthesized samples. The 5Ag-ZnO sample proclaimed the degradation efficiency (DE) in 70 min of 97.8% and the kap of 0.031 min-1. The influences of catalyst content, solution pH, and concentration of dye on the photodegradation efficiency of the composite were thoroughly studied. Besides, the photocatalytic activity of the composite was demonstrated by degrading various organic substances and reusability. In addition, it was compared to a metal-semiconductor catalyst of Au-ZnO and semiconductor-semiconductor catalysts of MoS2-ZnO, Cu2O-ZnO, and SiO2-ZnO. The catalytic mechanism under visible light was proposed.

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Section: Introductionmentioning

confidence: 99%

Preparation of carnation-like Ag-ZnO composites for enhanced photocatalysis under visible light

Mac

Nguyen

et al. 2023

Nanotechnology

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“…ZnO nanorods can be vertically aligned when grown on a suitable seed layer. , The ZnO seeds that act as nucleation centers for the nanorods are clearly visible on the modified PU strut surfaces (Figure ). They are sphere-like (i.e., aspect ratio around unity) sub-micrometer features/grains with a relatively uniform size distribution.…”

Section: Resultsmentioning

confidence: 99%

ZnO Nanorods Grown on Flexible Polyurethane Foam Surfaces for Photocatalytic Azo Dye Treatment

Kardeş

Yatmaz

Öztürk

2023

ACS Appl. Nano Mater.

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A flexible photocatalyst hybrid structure made up of aligned ZnO nanorods and three-dimensional networks of polyurethane (PU) foam struts was fabricated. The surfaces of the PU struts were first functionalized by the two-step chemical solution treatment method. The functional groups of the PU foam and the nanohybrid structure were characterized using Fourier transmission infrared spectroscopy (FTIR). Their crystal structures and morphologies were examined by using X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The adequacy of the chemical surface modification process was examined by analyzing the differences in the −N � C � O and O−H regions of the FTIR spectrum. The hybrid photocatalyst samples were also tested in terms of their structural integrities under ultrasonic irradiation. It was observed that the ZnO layers remained intact and adherent on the surfaces even after 1 h of sonication. The optical properties of the samples were also characterized by ultraviolet−visible (UV−vis) and photoluminescence (PL) spectroscopies. Aqueous Acid Red 88 (AR88) azo dye solutions were prepared and used to assess both the color and the total organic carbon (TOC) removal efficiencies of the samples utilizing the laboratory-scale photoreactor. The maximum color removal of 97% was reached in 180 min under UVA light irradiation as a consequence of simultaneous adsorption and photocatalysis mechanisms.

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“…The resulting holes migrate to the surface and are captured to neutralize the adsorbed oxygen that is already present on the surface of the ZnO nanowires. Thus, unpaired electrons remain, which increase the photocurrent [34,35].…”

Section: Resultsmentioning

confidence: 99%

Improved responsivity of MgZnO film ultraviolet photodetectors modified with vertical arrays ZnO nanowires by light trapping effect

Fei¹,

Jiang²,

Zhao³

et al. 2021

Nanotechnology

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The light trapping effect of ZnO nanowires (NWs) is attracting increasing attention as it effectively enhances the photoelectric effect. In this paper, high-density ZnO NWs are grown on a metal–semiconductor–metal structure MgZnO film UV photodetector (PD) as a light trapping unit. The photogenerated carriers diffuse along the longitudinal axis of the ZnO NWs, then diffuse onto the thin film and are collected by an applied bias electrode. When the device is connected to the NWs, the responsivity is about 12 times higher than that of the pure MgZnO film UV PD with a large light-dark current ratio (4.93 × 104). The array structure of the ZnO NWs enhances the number of photogenerated carriers at the top interface and provides a longer optical path length and a larger surface area. The resulting light trapping effect endows the device with excellent photoelectric properties. In this work, the introduction of NWs not only fundamentally improves the performance of the MgZnO thin film UV PD, but the resulting photodetector also demonstrates a sharp contrast between light trapping UV PD and the MgZnO thin film UV PD.

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Photocatalyst ZnO nanorod arrays on glass substrates: the critical role of seed layer in nanorod alignment and photocatalytic efficiencies

Cited by 12 publications

References 56 publications

Preparation of carnation-like Ag-ZnO composites for enhanced photocatalysis under visible light

Preparation of carnation-like Ag-ZnO composites for enhanced photocatalysis under visible light

ZnO Nanorods Grown on Flexible Polyurethane Foam Surfaces for Photocatalytic Azo Dye Treatment

Improved responsivity of MgZnO film ultraviolet photodetectors modified with vertical arrays ZnO nanowires by light trapping effect

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