Microstructural Analysis and the Multicolor UV/Violet/Blue/Green/Yellow PL Observed from the Synthesized ZnO Nano-leaves and Nano-rods

Validžić, Ivana Lj.; Mitrić, Miodrag; Ahrenkiel, S. Phillip; Čomor, Mirjana I.

doi:10.1007/s11661-015-2961-x

Cited by 10 publications

(4 citation statements)

References 57 publications

(69 reference statements)

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“…One band, the band edge (UV) emission, is attributed to free exciton recombination and the second band to visible light emission, which is produced by transitions excited from optical centers or deep levels to the valance level [39]. The reason for the visible emission in ZnO is still unclear and has been attributed to different types of defect centers leading to green, yellow and red emissions.…”

Section: Resultsmentioning

confidence: 99%

Low-temperature hydrothermally grown 100 μm vertically well-aligned ultralong and ultradense ZnO nanorod arrays with improved PL property

Kurudirek

Pradel

Summers

2017

Journal of Alloys and Compounds

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The hydrothermal synthesis of ZnO nanorods (NRs) has been investigated using ammonium hydroxide and polyethyleneimine as additives to the conventional nitrate based synthesis route, to obtain thin-films of well-aligned, ultradense and ultralong nanostructures. ZnO NRs longer than 60 μm were obtained in a one-cycle growth run and rod lengths ~ 100 μm by a two-cycle growth. The lengths of the rods were distributed uniformly across the substrate in all samples and highly dense NR arrays were observed. These conditions were obtained by a careful review of the nucleation and growth kinetics for this material system, such that the supersaturation of the solution was only relieved by precipitation on and in the presence of crystalline ZnO, and by the exploitation of a second growth phase due to the chelating behave of PEI and the products of HMTA. Also, the growth behavior was correlated to the solution pH values. The structural and optical data were found to be supportive of the growth conditions. The photoluminescence (PL) spectra from as-grown ultralong ZnO NRs exhibited a strong broad (580–625 nm) visible emission peak. However, annealing in a forming gas atmosphere at 623K (350°C) revealed a PL spectrum with a significantly decreased visible emission and an increased near band gap UV emission at 379 nm. Thus, the mechanisms associated with ammonium hydroxide and PEI addition provide a simple route for synthesizing ultralong and dense arrays of ZnO NRs at low temperature i.e. 368K (95°C).

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Section: Resultsmentioning

confidence: 99%

Low-temperature hydrothermally grown 100 μm vertically well-aligned ultralong and ultradense ZnO nanorod arrays with improved PL property

Kurudirek

Pradel

Summers

2017

Journal of Alloys and Compounds

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“…Another possible mechanism is the release of metal ions (Zn +2 ) from the surface of ZnO-NPs in the water present on the ZnO-NPs decorated GF paper. These metal ions Zn +2 can enter into bacterial cells through biosorption leading to the destruction of the cellular component and finally cell death [18][19][20][21][22]. From the analysis of the obtained results we can say that the antibacterial activity of the ZnO-NPs decorated GF paper is determined by three important factors; exposure between the ZnO-NPs and bacterial cells, amount of water present and surface area of the filter paper.…”

Section: Qualitative Results Of the Antibacterial Activity Of Zno-np mentioning

confidence: 98%

“…The most common and thermodynamically stable crystal structure of ZnO is wurtzite [18][19][20]. The direct band gap energy of 3.4 eV and some crystal defects make ZnO-NPs optically active in Ultra-Violet (UV) region of the visible spectrum for which it is used as UV protective agent [18][19][20][21][22]. Intrinsic defects like oxygen vacancies (Vo), zinc Interstitials (Zni), oxygen interstitials (Oi), zinc vacancies (Vzn), & oxygen antisite (Ozn), are responsible for the broad fluorescence emission of ZnO-NPs in the visible region with stronger emission between 550 to 650 nm [18][19][20][21][22].…”

mentioning

confidence: 99%

“…The antimicrobial activity of ZnO-NPs arises from the capability to generate hydrogen peroxide (H 2 O 2 ), reactive oxygen species (ROSs) and release of metal ion (Zn +2 ) from the surface. This activity depends on the micro to nanostructure, porosity, size, morphology, crystal defects, surface area, environment, etc [18][19][20][21][22]. There are various methods existing for the synthesis of electrochemical, solvothermal, precipitation sonochemical,.…”

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Zinc oxide nanoparticles decorated fluorescent and antibacterial glass fiber pre-filter paper

Gupta

Mishra

2020

Nano Ex.

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Zinc oxide nanoparticles (ZnO-NPs) were synthesized and decorated simultaneously onto the glass fiber pre-filter paper (GF paper) by the sonochemical method without using any additional reagents (a 'Green' synthesis approach). ZnO-NPs decorated GF paper was characterized by electron, confocal laser scanning and atomic force microscopy, fourier transform infrared and atomic emission spectroscopy, X-ray diffraction, and thermogravimetric analysis etc. Due to the massive void volume space, exceptional dimensional stability, large thickness (790 μm) of the GF paper (unlike other paper materials) and ultrasonic irradiation effects, ZnO-NPs were decorated in the enormous amount (96 mg per paper) without causing any adverse effects on the GF paper. Such a huge amount decoration onto GF paper makes it multifunctional, fluorescencet (orange-pink color, 535-624 nm) under ultra-violet light (360 nm) and antibacterial. The antibacterial activity of the ZnO-NPs decorated GF paper was examined against Gram-positive bacteria Bacillus subtilis 168 and Staphylococcus aureus (MCC 2043, pathogenic). The outcomes from the antibacterial experiments revealed ∼99% (2 log) reduction in the survival of the filtered bacteria (B. subtilis) on the ZnO-NPs decorated GF paper due to the toxicity of ZnO-NPs on bacterial cells like cell shrinkage, cytoplasmic leakage, cell burst, etc. Multifunctional, ZnO-NPs decorated GF paper could be used for fluorescencet and antibacterial paper-based applications.techniques are its expensiveness, inefficient in throughout three dimensional (3D) coating, requirement of extra reagents etc [15]. Thus, appropriate paper material as well as coating technique is required to fabricate costeffective and novel multifunctional paper. To the best of our information, fewer reports are available on glass filter papers. Through this study we have tried to explore the properties and possible applications of existing glass fiber pre-filter paper (GF paper) through decoration with the zinc oxide nanoparticles (ZnO-NPs). GF paper is made up of borosilicate microfibers, silica (SiO 2 ) as a main component and some quantity of boron oxide (B 2 O 3 ), aluminium oxide (Al 2 O 3 ), sodium oxide (Na 2 O) and potassium oxide (K 2 O) [17]. Glass fibers have some exceptional properties which make them very different from natural fibers such as excellent strength, heat and chemical resistant but not to strongly alkaline and acidic (hydrofluoric acid) environment [17]. Fibers of the GF paper are thinner in diameter (100 nm to several μm) and uniform in contrast to the fibers of the other papers because of which GF paper have massive void volume space and large surface area [17]. Thickness of the GF paper is large (790 μm), so all these properties make it appropriate for filtering heavily contaminated liquids. Resin bonded and unbounded GF papers are available for the wide application in the filtration technique. Acrylic resin-bonded GF papers have more rigidity, dimensional stability and strength in comparison to the unbounded one as ...

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Unveiling the photocorrosion mechanism of zinc oxide photocatalyst: Interplay between surface corrosion and regeneration

Dimitropoulos,

Aggelopoulos,

Sygellou

et al. 2024

Journal of Environmental Chemical Engineering

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Microstructural Analysis and the Multicolor UV/Violet/Blue/Green/Yellow PL Observed from the Synthesized ZnO Nano-leaves and Nano-rods

Cited by 10 publications

References 57 publications

Low-temperature hydrothermally grown 100 μm vertically well-aligned ultralong and ultradense ZnO nanorod arrays with improved PL property

Low-temperature hydrothermally grown 100 μm vertically well-aligned ultralong and ultradense ZnO nanorod arrays with improved PL property

Zinc oxide nanoparticles decorated fluorescent and antibacterial glass fiber pre-filter paper

Unveiling the photocorrosion mechanism of zinc oxide photocatalyst: Interplay between surface corrosion and regeneration

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