ZnO nanostructured materials and their potential applications: progress, challenges and perspectives

Ahmaruzzaman, Md.; Raha, Sauvik

doi:10.1039/d1na00880c

Cited by 323 publications

(156 citation statements)

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“…ZnO is classified as active photocatalysts due to wide absorption range and high photostability (Kołodziejczak-Radzimska and Jesionowski, 2014;Laurenti et al, 2017). Besides, ZnO is harmless and inexpensive, and ZnO nanostructures can be synthesized via different methods (Khan et al, 2019a(Khan et al, , 2019bRaha and Ahmaruzzaman, 2022). Qi et al (Qi et al, 2017) reviewed the photocatalytic applications of ZnO and suggested that the photocatalytic performance of ZnO nanomaterials could be improved by: 1) doping with metals or non-metals, 2) constructing heterojunctions, 3) coupling with carbon nanostructures, or 4) deposition of noble metals.…”

Section: Introductionmentioning

confidence: 99%

ZnO/Zn(OH)2 nanoparticles and self-cleaning coatings for the photocatalytic degradation of organic pollutants

Faheem

Siddiqi

Habib

et al. 2022

Front. Environ. Sci.

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Zinc oxide (ZnO) nanostructures have emerged as efficient heterogeneous photocatalysts for the degradation of organic pollutants in aqueous solutions and industrial wastewaters. In this work, a simple and effective method is reported for the synthesis of zinc oxide/zinc hydroxide (ZnO/Zn(OH)2) hybrid nanoparticles using a mineral acid to enhance the photocatalytic activity of ZnO. Infrared spectroscopy reveals the presence of hydroxyl groups in ZnO/Zn(OH)2 nanoparticles. X-ray diffraction shows the formation of hexagonal wurtzite ZnO nanoparticles, which retain their wurtzite structure after acid treatment but additional diffractions for Zn(OH)2 are also recorded. The optical bandgap of resulting ZnO and ZnO/Zn(OH)2 nanoparticles is reduced to 3.05 and 3.08 eV, respectively. In the initial photocatalysis experiments, ZnO/Zn(OH)2 nanoparticles exhibit 3.5-times improved degradation and removal of sunset yellow dye, a model organic pollutant, from deionized water compared to pristine ZnO nanoparticles. Hence, for further studies, ZnO/Zn(OH)2 coatings are fabricated on glass slides with a uniform surface morphology as shown by the atomic force microscopy. The time-dependent UV-visible spectroscopy reveals the photocatalytic degradation of sunset yellow over the surface of ZnO/Zn(OH)2 coatings. The degradation reaction follows the pseudofirst-order mechanism with a rate constant of 2.9 × 10–2 min−1. The recyclability and stability experiments reveal the retention of appreciable photocatalytic activity of ZnO/Zn(OH)2 coatings (with >92% degradation efficiency after six successive cycles). The results are compared with recent examples from the pertinent literature. The surface hydroxyl groups on ZnO/Zn(OH)2 nanoparticles and bandgap lowering enhance the anchoring of dye molecules and electron transfer reactions.

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Section: Introductionmentioning

confidence: 99%

ZnO/Zn(OH)2 nanoparticles and self-cleaning coatings for the photocatalytic degradation of organic pollutants

Faheem

Siddiqi

Habib

et al. 2022

Front. Environ. Sci.

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“…ZnO is one of the most popular semiconducting materials with a wide energy bandgap of 3.37 eV and a large exciton binding energy of 60 meV [1]. Especially, hierarchical ZnO nanostructure has been a useful material with various applications in the field of energy production, such as photoelectrochemical water splitting to produce hydrogen fuel [2] and dye-sensitized solar-cell [3,4].…”

Section: Introductionmentioning

confidence: 99%

Branches of ZnO nanostructure grown on sub-microrod template with seed layer coated by ultrasonic-assisted immersion technique: effect of surface energy on the growth of branches

Siriphongsapak

Denchitcharoen

2022

Mater. Res. Express

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Branches of ZnO nanostructure were hydrothermally grown on seed layer coated on sub-microrod template by ultrasonic-assisted immersion technique. Zinc acetate, monoethanolamine, and isopropanol were used as a precursor, stabilizer, and solvent for coating seed layer, respectively. The crystallization of seed layer, which was confirmed by x-ray diffractometer (XRD) and x-ray photoelectron spectrometer (XPS), was facilitated by ultrasonic irradiation. The sol concentration was adjusted to be 20 and 50 mM with the coating cycles of 8 and 16 for controlling the uniformity and surface energy of seed layer. The increase of sol concentration and coating cycles led to the increase of crystal orientation in (002) plane causing the improvement of seed layer’s surface energy which was estimated from water contact angle of the template. Atomic force microscope (AFM) was revealed that the seed layer did not cover the template only at the lowest condition of both sol concentration and coating cycles. However, the roughness and maximum peak-to-valley value tended to be increased for other conditions and dropped for the last condition which was suitable to vertically grow branches. After the growth of branches, the morphology of hierarchical ZnO nanostructure was investigated by field-emission scanning electron microscope (FESEM). It was found that the branches were vertically grown on the surface of rod template in every condition except the lowest sol concentration and coating cycles. Moreover, when the sol concentration and coating cycle of seed layer were increased, the branch density was also increased.

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“…[34][35][36] ZnO has thus been the champion material for UV detection with extensive research over time. 27,[37][38][39][40][41][42][43][44] Nevertheless, ZnO has had a lot of hidden surprises under its hat, which continue to be revealed to researchers. One such example of this is its ability to detect UV without providing any external electrical bias, in so called self-powered PDs.…”

Section: Introductionmentioning

confidence: 99%

Self-powered ZnO-based pyro-phototronic photodetectors: impact of heterointerfaces and parametric studies

et al. 2022

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ZnO nanostructured materials and their potential applications: progress, challenges and perspectives

Abstract: Extensive research in nanotechnology has been going on to investigate new behaviours and properties of materials with nanoscale dimensions. ZnO NPs owing to their distinct physical and chemical properties have...

Cited by 323 publications

References 292 publications

ZnO/Zn(OH)2 nanoparticles and self-cleaning coatings for the photocatalytic degradation of organic pollutants

ZnO/Zn(OH)2 nanoparticles and self-cleaning coatings for the photocatalytic degradation of organic pollutants

Branches of ZnO nanostructure grown on sub-microrod template with seed layer coated by ultrasonic-assisted immersion technique: effect of surface energy on the growth of branches

Self-powered ZnO-based pyro-phototronic photodetectors: impact of heterointerfaces and parametric studies

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