Optical and Structural Properties of ZnO Nanoparticles Synthesized by CO2 Microwave Plasma at Atmospheric Pressure

The results of carbon-doped zinc oxide nanoparticles synthesized by CO2 microwave plasma at atmospheric pressure are presented. The 2.45-GHz microwave plasma torch and feeder for injecting Zn granules are used in the synthesis of zinc oxide nanoparticles. The Zn granules (13.5 g/min) were introduced into the microwave plasma by CO2 (5 l/min) swirl gas. The microwave power delivered to the CO2 microwave plasma was 1 kW. The synthesis of carbon-doped zinc oxide nanoparticles was carried out in accordance with CO2 + Zn → carbon-doped ZnO + CO. The synthesized carbon-doped zinc oxide nanoparticles have a high purity hexagonal phase. The absorption edge of carbon-doped zinc oxide nanoparticles exhibited a red shift from a high-energy wavelength to lower in the UV-visible spectrum, due to band gap narrowing. A UV-NIR spectrometer, X-ray diffraction, emission scanning electron-microscopy, energy dispersive X-ray microanalysis, Fourier transform infrared spectroscopy, and a UV-Vis-NIR spectrophotometer were used for the characterization of the as-produced products.

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Green Synthesis, Characterization and Antimicrobial Activity of Zinc Oxide Nanoparticles on Clinical Isolates of Streptococcus pyogenes

Asian Journal of Chemistry ◽

10.14233/ajchem.2020.22495 ◽

2020 ◽

Vol 32 (4) ◽

pp. 907-911

Author(s):

S. Akash ◽

N. Ahalya ◽

P. Dhamodhar

Keyword(s):

Zinc Oxide ◽

Band Gap ◽

Streptococcus Pyogenes ◽

Zinc Oxide Nanoparticles ◽

Hexagonal Phase ◽

Combustion Method ◽

Oxide Nanoparticles ◽

Zno Nanoparticle ◽

Zno Nps ◽

X Ray

Zinc oxide nanoparticles were synthesized using epicarp of Punica granatum by combustion method at moderate temperatures. Zinc oxide nanoparticles obtained in agglomerate form were characterized by powder X-ray diffractometer (PXRD) and found to have hexagonal phase, wurtzite structure. The crystalline size of nanoparticle was found to be ~ 60 nm by using Debye-Scherrer formula. The morphology Index, Lorentz factor and Lorentz polarization factor were also calculated. Ultraviolet-visible spectroscopy (UV-vis) spectrum for ZnO nanoparticle showed a strong absorbance at 374 nm. This corresponds to the calculated band gap energy of 3.48 eV and the particle size calculated using band gap was found to be 50 nm. The Fourier Transform Infrared Spectroscopy (FTIR) spectrum showed a peak at 499 cm-1, which indicated Zn-O stretch bond. The scanning electron microscopy (SEM) analysis proved the size of nanoparticles synthesized were around 50 nm and energy dispersive X-ray spectroscopy (EDS) revealed the elemental composition of zinc oxide nanoparticles. The ZnO-NPs were evaluated for antibacterial activity against gram positive, tonsillitis causing Streptococcus pyogenes. From the present study, it was concluded that zinc oxide nanoparticles synthesized by combustion method could be valuable and economic in the field of nanotechnology.

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Statistical optimization of experimental parameters for extracellular synthesis of zinc oxide nanoparticles by a novel haloalaliphilic Alkalibacillus sp.W7

Scientific Reports ◽

10.1038/s41598-021-90408-y ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Hend M. H. Al-Kordy ◽

Soraya A. Sabry ◽

Mona E. M. Mabrouk

Keyword(s):

Zinc Oxide ◽

Zinc Oxide Nanoparticles ◽

Visible Spectrum ◽

Spherical Shape ◽

Hexagonal Wurtzite Structure ◽

Oxide Nanoparticles ◽

Elemental Distribution ◽

Zno Nps ◽

X Ray ◽

Stabilizing Agents

AbstractGreen synthesis of zinc oxide nanoparticles (ZnO NPs) through simple, rapid, eco-friendly and an economical method with a new haloalkaliphilic bacterial strain (Alkalibacillus sp. W7) was investigated. Response surface methodology (RSM) based on Box-Behnken design (BP) was used to optimize the process parameters (ZnSO4.7H2O concentration, temperature, and pH) affecting the size of Alkalibacillus-ZnO NPs (Alk-ZnO NPs). The synthesized nanoparticles were characterized using UV–visible spectrum, X-ray diffraction (XRD), Scanning electron microscope-energy dispersive X-ray spectroscopy (SEM–EDX), Transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and Zeta potential. The UV–Vis spectrum of ZnO NPs revealed a characteristic surface plasmon resonance (SPR) peak at 310 nm. XRD pattern confirmed the hexagonal wurtzite structure of highly pure with a crystallite size 19.5 nm. TEM proved the quasi-spherical shape nanoparticles of size ranging from 1 to 30 nm. SEM–EDX showed spherical shaped and displayed a maximum elemental distribution of zinc and oxygen. FTIR provided an evidence that the biofunctional groups of metabolites in Alkalibacillus sp.W7 supernatant acted as viable reducing, capping and stabilizing agents.

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Biosynthesis of Zinc Oxide Nanoparticles from Acacia nilotica (L.) Extract to Overcome Carbapenem-Resistant Klebsiella Pneumoniae

Molecules ◽

10.3390/molecules26071919 ◽

2021 ◽

Vol 26 (7) ◽

pp. 1919

Author(s):

Elsayim Rasha ◽

AlOthman Monerah ◽

Alkhulaifi Manal ◽

Ali Rehab ◽

Doud Mohammed ◽

...

Keyword(s):

Electron Microscopy ◽

Zinc Oxide ◽

Klebsiella Pneumoniae ◽

Zinc Oxide Nanoparticles ◽

Acacia Nilotica ◽

Oxide Nanoparticles ◽

Zno Nps ◽

X Ray ◽

Carbapenem Resistant

Recently, concerns have been raised globally about antimicrobial resistance, the prevalence of which has increased significantly. Carbapenem-resistant Klebsiella pneumoniae (KPC) is considered one of the most common resistant bacteria, which has spread to ICUs in Saudi Arabia. This study was established to investigate the antibacterial activity of biosynthesized zinc oxide nanoparticles (ZnO-NPs) against KPC in vitro and in vivo. In this study, we used the aqueous extract of Acacia nilotica (L.) fruits to mediate the synthesis of ZnO-NPs. The nanoparticles produced were characterized by UV-vis spectroscopy, zetasizer and zeta potential analyses, X-ray diffraction (XRD) spectroscopy, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and transmission electron microscopy (TEM). The antimicrobial activity of ZnO-NPs against KPC was determined via the well diffusion method, and determining minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC), the results showed low MIC and MBC when compared with the MIC and MBC of Imipenem and Meropenem antibiotics. The results of in vitro analysis were supported by the results upon applying ZnO-NP ointment to promote wound closure of rats, which showed better wound healing than the results with imipenem ointment. The biosynthesized ZnO-NPs showed good potential for use against bacteria due to their small size, applicability, and low toxicity to human cells.

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Scolicidal activity of biosynthesized zinc oxide nanoparticles by Mentha longifolia L. leaves against Echinococcus granulosus protoscolices

Emergent Materials ◽

10.1007/s42247-021-00264-9 ◽

2021 ◽

Author(s):

Bushra H. Shnawa ◽

Samir M. Hamad ◽

Azeez A. Barzinjy ◽

Payman A. Kareem ◽

Mukhtar H. Ahmed

Keyword(s):

Zinc Oxide ◽

Zinc Oxide Nanoparticles ◽

Public Health Problem ◽

Analytical Techniques ◽

Oxide Nanoparticles ◽

Zno Nps ◽

Leaf Extracts ◽

X Ray ◽

Morphological Alterations ◽

Mentha Longifolia

AbstractCystic echinococcosis is a public health problem in developing countries that practice sheep breeding extensively. In the current study, the protoscolicidal activity of biosynthesized zinc oxide nanoparticles (ZnO NPs) derived from Mentha longifolia L. leaf extracts was investigated. The resultant ZnO NPs were characterized by means of various analytical techniques, such as ultraviolet–visible (UV–Vis) spectrometry, Fourier transform infrared (FT-IR) spectrophotometry, X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX) analysis. The results showed that the ZnO NP had the highest scolicidal activity at 400 ppm concentration after 150 min of exposure time, showing 100% mortality rate. The treated protoscolices exhibited loss of viability with several morphological alterations. Hence, an easy and effective green synthesis of ZnO NPs, with efficient scolicidal potential, is reported in this study.

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Thermophysiological comfort of zinc oxide nanoparticles coated woven fabrics

Scientific Reports ◽

10.1038/s41598-020-78305-2 ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Muhammad Tayyab Noman ◽

Michal Petru ◽

Nesrine Amor ◽

Petr Louda

Keyword(s):

Surface Roughness ◽

Zinc Oxide ◽

Surface Topography ◽

Zinc Oxide Nanoparticles ◽

Air Permeability ◽

Woven Fabrics ◽

Oxide Nanoparticles ◽

Zno Nps ◽

X Ray ◽

Moisture Management

AbstractThis study investigates physicochemical impact of ultrasonic irradiations on surface topography of woven fabrics. In a simultaneous in-situ sonochemical method, the synthesis and coating of zinc oxide nanoparticles (ZnO NPs) on woven textiles were successfully achieved. Different instruments i.e. Alambeta, moisture management tester, air permeability tester and permetester were utilised during experimentation for thermal evaluation, moisture transportation and air permeation. The results regarding thermophysiological comfort of ZnO coated fabrics were evaluated on the basis of thickness and ZnO NPs coated amount on fabrics. In addition, the achieved results depict the impact of sonication (pressure gradient) on surface roughness of cotton and polyester. The coating of ZnO NPs on fabrics, crystal phase identification, surface topography and fluctuations in surface roughness were estimated by inductively coupled plasma atomic emission spectroscopy (ICP-AES), X-ray Diffractometry (XRD), ultrahigh-resolution scanning electron microscopy (UHR-SEM) and energy dispersive X-ray (EDX). Moreover, thermophysiological properties i.e. thermal conductivity, absolute evaporative resistance, thermal absorptivity, air permeability, overall moisture management capacity and relative water vapour permeability of untreated and ZnO treated samples were evaluated by standard test methods.

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Preparation, Characterization and Photocatalytic Activity of La-Doped Zinc Oxide Nanoparticles

Materials ◽

10.3390/ma12081195 ◽

2019 ◽

Vol 12 (8) ◽

pp. 1195 ◽

Cited By ~ 12

Author(s):

Loan T. T. Nguyen ◽

Lan T. H. Nguyen ◽

Anh T. T. Duong ◽

Bui Duc Nguyen ◽

Nguyen Quang Hai ◽

...

Keyword(s):

Zinc Oxide ◽

Photocatalytic Activity ◽

Methyl Orange ◽

Zinc Oxide Nanoparticles ◽

Combustion Method ◽

Poly Vinyl Alcohol ◽

Oxide Nanoparticles ◽

Visible Absorption ◽

X Ray ◽

La Doped

Lanthanum (La)-doped zinc oxide nanoparticles were synthesized with different La concentrations by employing a gel combustion method using poly(vinyl alcohol) (PVA). The as-synthesized photocatalysts were characterized using various techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), photoluminescence (PL) spectroscopy, and UV–visible absorption spectroscopy. The average size of ZnO nanoparticles decreased from 34.3 to 10.3 nm with increasing concentrations of La, and the band gap, as evaluated by linear fitting, decreased from 3.10 to 2.78 eV. Additionally, it was found that the photocatalytic activity of doped samples, as investigated by using methyl orange dye under visible lights, improved in response to the increase in La concentration. The decomposition of methyl orange reached 85.86% after 150 min in visible light using La0.1Zn0.9O as the photocatalyst.

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Bioactivities of Geranium wallichianum Leaf Extracts Conjugated with Zinc Oxide Nanoparticles

Biomolecules ◽

10.3390/biom10010038 ◽

2019 ◽

Vol 10 (1) ◽

pp. 38 ◽

Cited By ~ 21

Author(s):

Banzeer Ahsan Abbasi ◽

Javed Iqbal ◽

Riaz Ahmad ◽

Layiq Zia ◽

Sobia Kanwal ◽

...

Keyword(s):

Electron Microscopy ◽

Zinc Oxide ◽

Zinc Oxide Nanoparticles ◽

Energy Dispersive ◽

Oxide Nanoparticles ◽

X Ray Diffraction ◽

Leaf Extracts ◽

Tem Analysis ◽

X Ray ◽

Transmission Electron

This study attempts to obtain and test the bioactivities of leaf extracts from a medicinal plant, Geranium wallichianum (GW), when conjugated with zinc oxide nanoparticles (ZnONPs). The integrity of leaf extract-conjugated ZnONPs (GW-ZnONPs) was confirmed using various techniques, including Ultraviolet–visible spectroscopy, X-Ray Diffraction, Fourier Transform Infrared Spectroscopy, energy-dispersive spectra (EDS), scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. The size of ZnONPs was approximately 18 nm, which was determined by TEM analysis. Additionally, the energy-dispersive spectra (EDS) revealed that NPs have zinc in its pure form. Bioactivities of GW-ZnONPs including antimicrobial potentials, cytotoxicity, antioxidative capacities, inhibition potentials against α-amylase, and protein kinases, as well as biocompatibility were intensively tested and confirmed. Altogether, the results revealed that GW-ZnONPs are non-toxic, biocompatible, and have considerable potential in biological applications.

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Biosynthesis of Zinc Oxide Nanoparticles Using Pongamia pinnata Plant Leaves Extract

Asian Journal of Materials Chemistry ◽

10.14233/ajmc.2019.ajmc-p75 ◽

2019 ◽

pp. 43-46

Author(s):

Sneha Sawade ◽

Pramod Kulkarni

Keyword(s):

Zinc Oxide ◽

Aqueous Extract ◽

Zinc Oxide Nanoparticles ◽

Pongamia Pinnata ◽

Oxide Nanoparticles ◽

Capping Agent ◽

Plant Leaves ◽

X Ray Diffraction ◽

X Ray ◽

Average Size

We reported a simple, green and eco-friendly approach for the synthesis of zinc oxide nanoparticles using aqueous extract of Pongamia pinnata plant leaves acts as reducing agent as well as capping agent. Biosynthesized zinc oxide nanoparticles were characterized by FTIR, X-ray diffraction and field emission scanning electron microscopy. The results suggested that the zinc oxide nanoparticles synthesized by aqueous extract of Pongamia pinnata plant leaves with high purity, mostly spherical in shape with an average size of 23.5 nm.

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LASER-INDUCED PHOTOLUMINESCENT STUDIES OF Al-DOPED ZINC OXIDE NANOPARTICLES

International Journal of Nanoscience ◽

10.1142/s0219581x10007101 ◽

2010 ◽

Vol 09 (05) ◽

pp. 439-445

Author(s):

DHIRAJ KUMAR ◽

SUNIL KUMAR ◽

H. S. BHATTI

Keyword(s):

Zinc Oxide ◽

Zinc Oxide Nanoparticles ◽

Oxide Nanoparticles ◽

Nitrogen Laser ◽

X Ray Diffraction ◽

Electron Microscopic ◽

Time Resolved ◽

X Ray ◽

Aluminum Ions ◽

Transmission Electron

In this paper, addition of aluminum in zinc oxide is incorporated using low-temperature chemical synthesis route. Aluminum ions help in crystallization of zinc oxide nanoparticles. Characterization of the synthesized nanoparticles of zinc oxide has been done using Transmission electron microscope (TEM), and X-ray diffraction (XRD) analysis, Energy-resolved photoluminescence (PL) spectra and Time-resolved laser-induced photoluminescence (TRPL) at room temperature. Transmission electron microscopic observations and X-Ray diffraction studies indicate highly crystalline nature and particle size of the order of 20 nm in ZnO:Al . Time-resolved laser-induced photoluminescence measurements have been done using pulsed nitrogen laser as an excitation source, operated at wavelength 337.1 nm and having high peak output power of 1 MW. The results show that at higher concentrations of Al doping in host ZnO phosphor, emission intensity is more by several orders of magnitude and lifetime shortening indicates that these nanoparticles are more efficient as compared with lower concentrations of dopant.

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Friedel-Crafts benzoylation reaction of aromatic compounds using zinc oxide nanoparticles in deep eutectic solvent (choline chloride/urea) under microwave irradiation

Science and Technology Development Journal - Natural Sciences ◽

10.32508/stdjns.v2i2.735 ◽

2019 ◽

Vol 2 (2) ◽

pp. 62-70

Author(s):

Hai Truong Nguyen ◽

Dung Thi Kim Ngo ◽

Thinh Nguyen Huu Pham ◽

Phuong Hoang Tran

Keyword(s):

Zinc Oxide ◽

Microwave Irradiation ◽

Aromatic Compounds ◽

Zinc Oxide Nanoparticles ◽

Choline Chloride ◽

Deep Eutectic Solvent ◽

Reaction Times ◽

Oxide Nanoparticles ◽

X Ray ◽

High Yields

Synthesis of zinc oxide nanoparticles (ZnO) which was found to be effective catalyst for Friedel-Crafts benzoylation reaction in the presence of deep eutectic solvent (DES). The method is one of the most important intermediates for preparing fine chemicals in the field of pharmaceuticals, which is a tool for organic syntheses of aromatic ketones. ZnO precursor was prepared from Zn(CH3COO)2.2H2O and H2C2O4.2H2O, ZnO nanoparticles were characterized by using X-ray Powder Diffraction (XRD), Scanning Electron Microscope (SEM). The benzoylation of aromatic compounds and benzoyl chloride using nanoparticles ZnO/ [CholineCl][Urea]2, under microwave irradiation afforded the desired products in high yields and short reaction times. The catalyst/solvent could be recycled several times without loss of efficient catalytic activity.

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