Morphology Transition of ZnO Nanorod Arrays Synthesized by a Two-Step Aqueous Solution Method

He, Guannan; Huang, Bo; Lin, Zeheng; Yang, Weifeng; He, Qinyu; Li, Lunxiong

doi:10.3390/cryst8040152

Cited by 7 publications

(8 citation statements)

References 37 publications

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“…The dehydration of [Zn(OH)4] 2− in the final stage takes place by heating the solution to a mild temperature to generate ZnO (reaction 3) [88,94]. The chemical reactions involved for the zincate formation and its subsequent dehydration to produce ZnO are given by [88,93]: [79] under the terms of the Creative Commons Attribution 3.0 license.…”

Section: Crystal Growth Unit (Zincate)mentioning

confidence: 99%

“…A basic solution with water/organic compound as the solvent used in dissolving metal salt precursor. The zinc salts generally employed include zinc nitrate (Zn(NO 3 ) 2 ), zinc chloride (ZnCl 2 ), zinc sulfate (ZnSO 4 ) and zinc acetate dihydrate (Zn(CH 3 COO) 2 • 2H 2 O) [88][89][90][91][92][93]. In a typical synthesis, the dissolution of zinc salt in a solvent gives Zn 2+ ions that react with hydroxyl group to form Zn(OH) 2 (reaction 1).…”

Section: Crystal Growth Unit (Zincate)mentioning

confidence: 99%

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Interactions of Zinc Oxide Nanostructures with Mammalian Cells: Cytotoxicity and Photocatalytic Toxicity

Liao

Jin

et al. 2020

IJMS

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This article presents a state-of-the-art review and analysis of literature studies on the morphological structure, fabrication, cytotoxicity, and photocatalytic toxicity of zinc oxide nanostructures (nZnO) of mammalian cells. nZnO with different morphologies, e.g., quantum dots, nanoparticles, nanorods, and nanotetrapods are toxic to a wide variety of mammalian cell lines due to in vitro cell–material interactions. Several mechanisms responsible for in vitro cytotoxicity have been proposed. These include the penetration of nZnO into the cytoplasm, generating reactive oxygen species (ROS) that degrade mitochondrial function, induce endoplasmic reticulum stress, and damage deoxyribonucleic acid (DNA), lipid, and protein molecules. Otherwise, nZnO dissolve extracellularly into zinc ions and the subsequent diffusion of ions into the cytoplasm can create ROS. Furthermore, internalization of nZnO and localization in acidic lysosomes result in their dissolution into zinc ions, producing ROS too in cytoplasm. These ROS-mediated responses induce caspase-dependent apoptosis via the activation of B-cell lymphoma 2 (Bcl2), Bcl2-associated X protein (Bax), CCAAT/enhancer-binding protein homologous protein (chop), and phosphoprotein p53 gene expressions. In vivo studies on a mouse model reveal the adverse impacts of nZnO on internal organs through different administration routes. The administration of ZnO nanoparticles into mice via intraperitoneal instillation and intravenous injection facilitates their accumulation in target organs, such as the liver, spleen, and lung. ZnO is a semiconductor with a large bandgap showing photocatalytic behavior under ultraviolet (UV) light irradiation. As such, photogenerated electron–hole pairs react with adsorbed oxygen and water molecules to produce ROS. So, the ROS-mediated selective killing for human tumor cells is beneficial for cancer treatment in photodynamic therapy. The photoinduced effects of noble metal doped nZnO for creating ROS under UV and visible light for killing cancer cells are also addressed.

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Section: Crystal Growth Unit (Zincate)mentioning

confidence: 99%

Section: Crystal Growth Unit (Zincate)mentioning

confidence: 99%

Interactions of Zinc Oxide Nanostructures with Mammalian Cells: Cytotoxicity and Photocatalytic Toxicity

Liao

Jin

et al. 2020

IJMS

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“…Co-precipitation method involves the dissolution of a metal salt precursor in water/organic solvent for precipitating oxo-hydroxide in the presence of a strong alkali metal hydroxide (MOH; M = Li, Na, K, Cs), or weak hexamethylenetetramine (HMTA) [210][211][212][213][214]. In the process, zinc metal salt precursor decomposes in the solution to yield Zn 2+ for forming Zn(OH) 2 .…”

Section: Co-precipitation Methodsmentioning

confidence: 99%

“…The [Zn(NH 3 ) 4 ] 2+ complex also acts as the growth unit for ZnO nuclei. Overall, the reactions are given as follows [210,211],…”

Section: Co-precipitation Methodsmentioning

confidence: 99%

Recent Advances in Zinc Oxide Nanostructures with Antimicrobial Activities

Liao

Tjong

2020

IJMS

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This article reviews the recent developments in the synthesis, antibacterial activity, and visible-light photocatalytic bacterial inactivation of nano-zinc oxide. Polycrystalline wurtzite ZnO nanostructures with a hexagonal lattice having different shapes can be synthesized by means of vapor-, liquid-, and solid-phase processing techniques. Among these, ZnO hierarchical nanostructures prepared from the liquid phase route are commonly used for antimicrobial activity. In particular, plant extract-mediated biosynthesis is a single step process for preparing nano-ZnO without using surfactants and toxic chemicals. The phytochemical molecules of natural plant extracts are attractive agents for reducing and stabilizing zinc ions of zinc salt precursors to form green ZnO nanostructures. The peel extracts of certain citrus fruits like grapefruits, lemons and oranges, acting as excellent chelating agents for zinc ions. Furthermore, phytochemicals of the plant extracts capped on ZnO nanomaterials are very effective for killing various bacterial strains, leading to low minimum inhibitory concentration (MIC) values. Bioactive phytocompounds from green ZnO also inhibit hemolysis of Staphylococcus aureus infected red blood cells and inflammatory activity of mammalian immune system. In general, three mechanisms have been adopted to explain bactericidal activity of ZnO nanomaterials, including direct contact killing, reactive oxygen species (ROS) production, and released zinc ion inactivation. These toxic effects lead to the destruction of bacterial membrane, denaturation of enzyme, inhibition of cellular respiration and deoxyribonucleic acid replication, causing leakage of the cytoplasmic content and eventual cell death. Meanwhile, antimicrobial activity of doped and modified ZnO nanomaterials under visible light can be attributed to photogeneration of ROS on their surfaces. Thus particular attention is paid to the design and synthesis of visible light-activated ZnO photocatalysts with antibacterial properties

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“…At present, microwave absorbing materials with lightweight electromagnetic are widely used in people’s livelihoods and military needs, and its property enhancement has also become a hot spot of domestic and international research [1,2,3,4,5]. Previous studies have found that the intrinsic electromagnetic wave absorption mechanisms of traditional single-phase ferrite [6], magnetic metal [7], C-type absorbing [8], semiconductor [9] and macromolecule absorbing materials [10] are mainly their own single dielectric loss and magnetic loss, which can no longer meet the need for an excellent absorbing property.…”

Section: Introductionmentioning

confidence: 99%

The Preparation of FeCo/ZnO Composites and Enhancement of Microwave Absorbing Property by Two-Step Method

et al. 2019

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In this paper, the flower-like FeCo/ZnO composites were successfully firstly prepared by a two-step method, and their microstructures and microwave absorbing properties were characterized. The results show that with an increase of temperature, the content of ZnO loaded on a FeCo/ZnO composite surface was increased. The optimal reflection loss (RL) value can be reached around −53.81 dB at 9.8 GHz, which is obviously superior to results of previous studies and reports, and its effective bandwidth (RL < −10 dB) is 3.8 GHz in the frequency range of 8.7–11.8 GHz with a matching thickness of 1.9 mm. We considered that a large number of lamellar and rod-like ZnO loaded on nano-FeCo single-phase solid solution by two-step method can significantly improve the electromagnetic wave absorption properties.

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Morphology Transition of ZnO Nanorod Arrays Synthesized by a Two-Step Aqueous Solution Method

Cited by 7 publications

References 37 publications

Interactions of Zinc Oxide Nanostructures with Mammalian Cells: Cytotoxicity and Photocatalytic Toxicity

Interactions of Zinc Oxide Nanostructures with Mammalian Cells: Cytotoxicity and Photocatalytic Toxicity

Recent Advances in Zinc Oxide Nanostructures with Antimicrobial Activities

The Preparation of FeCo/ZnO Composites and Enhancement of Microwave Absorbing Property by Two-Step Method

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