The role of ammonia hydroxide in the formation of ZnO hexagonal nanodisks using sol–gel technique and their photocatalytic study

Thein, Myo Thuya; Pung, Swee‐Yong; Aziz, Azizan; Itoh, Makoto

doi:10.1080/17458080.2014.953609

Cited by 30 publications

(12 citation statements)

References 22 publications

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“…The chemical paths 5 and 6 summarize the last proposal [48] Path V: Zn(OH) With the increase in NH 4 OH contents, the number of NH 4 + and OH − was increased, thereby increasing the number of ion aggregates to produce the ZnO shell with Zn +2 and OH − as the surface bonds. Consequently, the ZnO nanocrystalline shell grew along the z-axis due to its high-energy polar planar orientation, thereby producing nanorods [47]. This argument was supported by both EFTEM and FESEM images which showed spherical ZnSiQDs, indicating the growth of a ZnO nanocrystalline shell in different directions due to the presence of NH 4 OH as a complexing agent to shift ZnO preferential growth orientation.…”

Section: Optical Characteristics Of Znsiqdsmentioning

confidence: 77%

“…This drop in the bandgap energy value can be attributed to the generation of many OH − and NH 4+ from the higher volume of NH 4 OH, allowing for the growth of large ZnSiQDs [46]. The unstable nature of Zn(OH) 4 −2 , Zn(OH) 2 , and Zn(NH 3 ) 4 +2 enabled Zn(NH 3 ) 4 +2 to react with OH − via the chemical pathway [47]:…”

Section: Optical Characteristics Of Znsiqdsmentioning

confidence: 99%

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Enhancement of Temperature Fluorescence Brightness of Zn@Si Core-Shell Quantum Dots Produced via a Unified Strategy

et al. 2021

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Despite many dedicated efforts, the fabrication of high-quality ZnO-incorporated Zinc@Silicon (Zn@Si) core–shell quantum dots (ZnSiQDs) with customized properties remains challenging. In this study, we report a new record for the brightness enhancement of ZnSiQDs prepared via a unified top-down and bottom-up strategy. The top-down approach was used to produce ZnSiQDs with uniform sizes and shapes, followed by the bottom-up method for their re-growth. The influence of various NH4OH contents (15 to 25 µL) on the morphology and optical characteristics of ZnSiQDs was investigated. The ZnSiQDs were obtained from the electrochemically etched porous Si (PSi) with Zn inclusion (ZnPSi), followed by the electropolishing and sonication in acetone. EFTEM micrographs of the samples prepared without and with NH4OH revealed the existence of spherical ZnSiQDs with a mean diameter of 1.22 to 7.4 nm, respectively. The emission spectra of the ZnSiQDs (excited by 365 nm) exhibited bright blue, green, orange-yellow, and red luminescence, indicating the uniform morphology related to the strong quantum confinement ZnSiQDs. In addition, the absorption and emission of the ZnSiQDs prepared with NH4OH were enhanced by 198.8% and 132.6%, respectively. The bandgap of the ZnSiQDs conditioned without and with NH4OH was approximately 3.6 and 2.3 eV, respectively.

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Section: Optical Characteristics Of Znsiqdsmentioning

confidence: 77%

Section: Optical Characteristics Of Znsiqdsmentioning

confidence: 99%

Enhancement of Temperature Fluorescence Brightness of Zn@Si Core-Shell Quantum Dots Produced via a Unified Strategy

et al. 2021

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“…When they move to the surface of the catalyst, e − reacts with O 2 in the solution to generate *OH and *O 2 radicals. These active species then react with MB to oxidize it and transform it into small molecules, thus achieving both purposes, decolorization and degradation of the organic matter [ 31 , 46 , 47 , 48 ].…”

Section: Discussionmentioning

confidence: 99%

Synthesis of the ZnTiO3/TiO2 Nanocomposite Supported in Ecuadorian Clays for the Adsorption and Photocatalytic Removal of Methylene Blue Dye

et al. 2020

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Currently, the study of semiconductor materials is very promising for the photocatalytic remediation of hazardous organic substances present in the air and water. Various semiconductors have been investigated in this interesting photo-assisted methodology, among them metal oxides such as ZnO, TiO2 and their derivatives. In this study, ZnTiO3/TiO2 was synthesized by the sol-gel method using Ti(OC3H7)4 and Zn(CH3COO)2 · 2H2O as reagents. The role of several conditions such as synthesis temperature and TiO2:ZnO proportion on the morphology and purity of compounds obtained was studied, and the suitable conditions for the synthesis of photocatalysts were determined. Various techniques were used to conduct a systematic investigation on the structural, morphological, and photocatalytic properties of ZnTiO3/TiO2. Scanning Electron Microscopy (SEM) images show that ZnTiO3/TiO2 have a typical particle size of approximately 100 nm with a quasi-spherical shape. The adsorption and photocatalytic activity were investigated by the decolorization of Methylene Blue (MB) as an organic contaminant under UV irradiation both in TiO2 and ZnTiO3/TiO2 supported over some Ecuadorian clays. The materials evaluated were prepared in the shape of 0.2 cm (diameter) and 1.0 cm (length) cylindrical extrudates. The degradation percentage of MB obtained was 85% approximately after 150 min of irradiation. The results obtained allow us to conclude that these synthesized materials can be used as adsorbents and photocatalysts.

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“…In this case, the formation of ZnO was based on a hydrolysis reaction [49] according to the following equations:…”

Section: Microwave-assisted Synthesis Of Zno Nanoparticlesmentioning

confidence: 99%

Facile In Situ Synthesis of ZnO Flower-like Hierarchical Nanostructures by the Microwave Irradiation Method for Multifunctional Textile Coatings

et al. 2021

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ZnO nanoparticle-based multifunctional coatings were prepared by a simple, time-saving microwave method. Arginine and ammonia were used as precipitation agents, and zinc acetate dehydrate was used as a zinc precursor. Under the optimized conditions, flower-like morphologies of ZnO aggregates were obtained. The prepared nanopowders were characterized using X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and UV/Visible spectroscopy. The developed in situ synthesis with microwave irradiation enabled significant ZnO nanoparticle deposition on cotton fabrics, without additional steps. The functionalized textiles were tested as a photocatalyst in methylene blue (MB) photodegradation and showed good self-cleaning and UV-blocking properties. The coated cotton fabrics exhibited good antibacterial properties against common microbial trains (Staphylococcus aureus, Escherichia coli, and Candida albicans), together with self-cleaning and photocatalytic efficiency in organic dye degradation. The proposed microwave-assisted in situ synthesis of ZnO nanocoatings on textiles shows high potential as a rapid, efficient, environmentally friendly, and scalable method to fabricate functional fabrics.

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The role of ammonia hydroxide in the formation of ZnO hexagonal nanodisks using sol–gel technique and their photocatalytic study

Cited by 30 publications

References 22 publications

Enhancement of Temperature Fluorescence Brightness of Zn@Si Core-Shell Quantum Dots Produced via a Unified Strategy

Enhancement of Temperature Fluorescence Brightness of Zn@Si Core-Shell Quantum Dots Produced via a Unified Strategy

Synthesis of the ZnTiO3/TiO2 Nanocomposite Supported in Ecuadorian Clays for the Adsorption and Photocatalytic Removal of Methylene Blue Dye

Facile In Situ Synthesis of ZnO Flower-like Hierarchical Nanostructures by the Microwave Irradiation Method for Multifunctional Textile Coatings

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