Zinc oxide nanostructures

Srivastava, Anchal; Katiyar, Anu

doi:10.1016/b978-0-323-89956-7.00012-7

Cited by 10 publications

(6 citation statements)

References 112 publications

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“…The band gap of metal oxides is an interesting property, which is involved in electronic applications. 30,31 Materials based on thoria are viewed as wide band gap semiconductors. For the case of thoria, there is little information in the literature regarding its band gap.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Solventless Preparation of Thoria and Its Inclusion into SiO₂ and TiO₂: A Luminescence and Photocatalysis Study

et al. 2021

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Thoria was prepared using a solid-state method from the macromolecular precursor Chitosan·Th(NO 3 ) 4 (chitosan) and PS-co-4-PVP·Th(NO 3 ) 4 (PVP). The morphology and the average size of ThO 2 depend of the chitosan and PS-co-4-PVP polymer forming the precursor. Their photoluminescent properties were investigated, finding a dependence of their intensity emission maxima, with the nature of the precursor polymer. The photocatalytic activity of ThO 2 toward the degradation of methylene blue was measured for the first time, finding a degradation of about 66% in 300 min. The inclusion of ThO 2 into SiO 2 and TiO 2 was achieved by the solid-state pyrolysis of the macromolecular composites Chitosan·Th(NO 3 ) 4 //MO 2 and PS-co-4-PVP·Th(NO 3 ) 4 //MO 2 , MO 2 = SiO 2 or TiO 2 . The ThO 2 exhibits a homogeneous dispersion inside the silica, showing sizes of about 40 and 50 nm for the chitosan and PVP polymer precursors, respectively. The luminescent properties of the ThO 2 /SiO 2 and ThO 2 /TiO 2 composites were also studied, finding a decrease in intensity when introducing the SiO 2 or TiO 2 matrices. The photocatalytic behavior to methylene blue degradation of ThO 2 and their composites ThO 2 /SiO 2 and ThO 2 /TiO 2 was investigated for the first time, with them in the following order: ThO 2 > ThO 2 /TiO 2 > ThO 2 /SiO 2 .

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Section: ■ Results and Discussionmentioning

confidence: 99%

Solventless Preparation of Thoria and Its Inclusion into SiO₂ and TiO₂: A Luminescence and Photocatalysis Study

et al. 2021

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“…[18] The co-precipitation approach was used to synthesize ZnO and Co doped ZnO because it is economical, easily reproducible, convenient, and results in a greater yield with good purity. [19] Furthermore, compared to other synthesis techniques, it produces products with a narrow range of crystalline size, regulated particle size, [20] homogenous dispersion, scalability, and adaptability. [21] After modifying the ZnO photocatalyst with the doping of Co 2 + , the photocatalytic experiment is led to discover the ideal doping ratio, examining the best photocatalyst under visible light with the use of methylene blue degradation.…”

Section: Introductionmentioning

confidence: 99%

“…The co‐precipitation approach was used to synthesize ZnO and Co doped ZnO because it is economical, easily reproducible, convenient, and results in a greater yield with good purity [19] . Furthermore, compared to other synthesis techniques, it produces products with a narrow range of crystalline size, regulated particle size, [20] homogenous dispersion, scalability, and adaptability [21] …”

Section: Introductionmentioning

confidence: 99%

Visible‐Light‐Active Electrospun Membranes Based on Cobalt‐Doped ZnO Nanohybrids: Applications for Food Packaging

Deshapriya,

Munaweera

2024

ChemistrySelect

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A cellulose acetate electrospun membrane based on Cobalt doped ZnO (Co‐ZnO) was developed. The synthesis of pure zinc oxide nanoparticles (NPs) and cobalt‐zinc oxide nanorods with varying cobalt‐to‐zinc atomic ratios of 5 %, 10 %, 15 %, and 20 % was carried out, using the co‐precipitation method. The successful incorporation of cobalt into ZnO was confirmed by using the techniques of Powder X‐ray Diffraction (PXRD), X‐ray Photoelectron Spectroscopy (XPS), and Energy Dispersive X‐ray Spectroscopy (EDX). Scanning Electron Microscopy (SEM) studies denoted the change in shape from spherical to rod‐shaped upon doping Co. A red shift was observed in band gap energies from 3.26‐3.01 eV upon increasing the Co concentration. The photocatalytic activity was evaluated, using methylene blue under sunlight and a 50 W LED lamp. The most effective photocatalyst observed in this study was a composition consisting of 15 % Co‐ZnO. When exposed to sunshine, this photocatalyst demonstrated a degradation rate of 40 % over a one‐hour period. Similarly, when subjected to a lamp, the degradation rate was found to be 24 % over the same duration. A nanofiber membrane was produced by incorporating Co‐ZnO at a concentration of 15 % (w/w) into the cellulose acetate (CA) polymer matrix by the electrospinning technique. The created CA nanofiber mat with Co‐ZnO was employed to extend the shelf life of strawberries up to 18 days along with the reduced pH increase and lower reduction of weight, firmness, and titratable acidity.

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“…Zinc oxide (ZnO) is a versatile semiconductor material with a direct wide bandgap of 3.37 eV, making it ideal for optoelectronic applications such as UV photodetectors, lasers, and LEDs. Zinc oxide's high exciton binding energy of around 60 meV at room temperature facilitates the efficient detection of gas molecules in gas sensing applications [1,2]. Additionally, zinc oxide (ZnO) possesses a wurtzite structure with a hexagonal lattice, where the lattice constants a and c are 0.325 nm and 0.521 nm, respectively [3].…”

Section: Introductionmentioning

confidence: 99%

Investigation of physicochemical characteristics of Dy³⁺ modified ZnO nanoparticles

Kumar,

Singh

2024

Phys. Scr.

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In this report, pristine and Dy3+ modified ZnO nanoparticles [Zn(1-x)DyxO NPs, where x = 0, 0.05, and 0.10] were synthesized using the sol-gel route, and their physicochemical characteristics were investigated. X-ray diffractograms of all the compositions possess P63mc space group depicting hexagonal crystallinity with wurtzite-type crystal structure with no signature of impurities as confirmed using the Rietveld refinement technique. The granular microstructure displayed grain growth with Dy3+ incorporation in the ZnO crystal framework and an increment in average grain size was found to be 22.83 nm for x = 0 to 36.34 nm. The optical energy band gap also increased from 3.35 eV to 3.88 eV with Dy3+ doping in the host ZnO. Dy3+ substitution inhibits the conduction in ZnO and improves the resistivity (36 Ωcm – 79 Ωcm) as carrier concentration diminishes from 7.36×1016 cm-3 to 4.23×1016 cm-3. Similarly, the mean free path length for ZnO and Dy3+ doped ZnO NPs declines from 0.0301 nm to 0.0198 nm. Dielectric properties of all the compositions were investigated using an LCR impedance analyzer and it was observed that Dy3+ substitution enhances the value of the dielectric constant from 32 to 91 with a low tangent loss at 50 Hz.

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Zinc oxide nanostructures

Cited by 10 publications

References 112 publications

Solventless Preparation of Thoria and Its Inclusion into SiO₂ and TiO₂: A Luminescence and Photocatalysis Study

Solventless Preparation of Thoria and Its Inclusion into SiO₂ and TiO₂: A Luminescence and Photocatalysis Study

Visible‐Light‐Active Electrospun Membranes Based on Cobalt‐Doped ZnO Nanohybrids: Applications for Food Packaging

Investigation of physicochemical characteristics of Dy³⁺ modified ZnO nanoparticles

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Zinc oxide nanostructures

Cited by 10 publications

References 112 publications

Solventless Preparation of Thoria and Its Inclusion into SiO2 and TiO2: A Luminescence and Photocatalysis Study

Solventless Preparation of Thoria and Its Inclusion into SiO2 and TiO2: A Luminescence and Photocatalysis Study

Visible‐Light‐Active Electrospun Membranes Based on Cobalt‐Doped ZnO Nanohybrids: Applications for Food Packaging

Investigation of physicochemical characteristics of Dy3+ modified ZnO nanoparticles

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Product

Resources

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Solventless Preparation of Thoria and Its Inclusion into SiO₂ and TiO₂: A Luminescence and Photocatalysis Study

Solventless Preparation of Thoria and Its Inclusion into SiO₂ and TiO₂: A Luminescence and Photocatalysis Study

Investigation of physicochemical characteristics of Dy³⁺ modified ZnO nanoparticles