scholarly journals Investigation on room temperature photoluminescence of pure and aluminum doped zinc oxide nanoparticles

2015 ◽  
Vol 33 (1) ◽  
pp. 205-212 ◽  
Author(s):  
N. Srinivasan ◽  
J.C. Kannan
Keyword(s):  
Zinc Oxide ◽  
Zinc Oxide Nanoparticles ◽  
Average Particle Size ◽  
Hexagonal Wurtzite Structure ◽  
Spectral Studies ◽  
Oxide Nanoparticles ◽  
Average Particle ◽  
Ir Studies ◽  
Aluminum Doped Zinc Oxide ◽  
Ft Ir

AbstractPure and aluminum doped zinc oxide nanoparticles were prepared by soft chemical method. The prepared nanoparticles were characterized by XRD, SEM-EDAX, UV-Vis, PL and FT-IR studies. XRD patterns revealed that the nanoparticles were crystallized in hexagonal wurtzite structure with an average particle size of 19 nm to 26 nm. The surface morphology was explored using SEM micrographs. The incorporation of aluminum was confirmed by EDAX and FT-IR studies. The band gaps of the particles were found from 3.48 eV to 3.53 eV through UV-Vis spectral studies. The defect related mechanism was investigated using PL measurements. The chemical functional groups in FT-IR spectra proved the formation of pure and aluminum doped zinc oxide nanoparticles.

Preparation and Antibacterial Performances of Electrocatalytic Zinc Oxide Nanoparticles with Diverse Morphologies

2021 ◽  
Vol 17 (9) ◽  
pp. 1824-1829
Author(s):  
Junlin Li ◽  
Xiangfei Li ◽  
Dong Liang ◽  
Xiaojuan Zhang ◽  
Qing Lin ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Surface Area ◽  
Zinc Oxide Nanoparticles ◽  
Average Particle Size ◽  
Three Dimensional ◽  
Diffusion Method ◽  
Oxide Nanoparticles ◽  
Average Particle ◽  
X Ray Diffraction ◽  
Zno Nps

This study exploits the potential of zinc oxide nanoparticles (ZnO-NPs) with diverse morphologies as catalysts and antibacterial agent. Spherical ZnO-NPs, rod-shaped ZnO-NPs and flower-shaped ZnO-NPs were prepared by microemulsion method, solvent heat method and hydrothermal method, respectively. The structural characterizations of samples were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. XRD results revealed the formation of spherical ZnO-NPs, rod-shaped ZnO-NPs and flower-shaped ZnO-NPs were all wurtzite crystal structure. SEM results showed that spherical ZnO-NPs had an average particle size of 30–40 nm, rod-shaped ZnO-NPs were about 500 nm long and 100 nm wide with obvious hexagonal crystals. Flower-shaped ZnO-NPs had a three-dimensional appearance with obvious petals. Results of electrochemical HER (Hydrogen evolution reaction) experiments revealed that spherical ZnO-NPs exhibited the highest electrocatalytic activity at the lowest potential voltage due to their largest specific surface area. The antibacterial property of ZnO-NPs samples were studied by the optical density method and disc diffusion method. All samples had antibacterial effects against E. coli. and flower-shaped ZnO-NPs showed the best antibacterial activity due to the largest surface area in comparison with spherical ZnO-NPs and rod-shaped ZnO-NPs, which promised the maximum Zn2+ release as bactericide mechanism that registered in the case of different ZnO-NPs morphologies.

scholarly journals Functional Properties of Sonochemically Synthesized Zinc Oxide Nanoparticles and Cotton Composites

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1661 ◽  
Author(s):  
Muhammad Tayyab Noman ◽  
Michal Petrů
Keyword(s):  
Zinc Oxide ◽  
Zinc Oxide Nanoparticles ◽  
Average Particle Size ◽  
Antimicrobial Properties ◽  
Acoustic Method ◽  
Oxide Nanoparticles ◽  
Average Particle ◽  
Gram Positive ◽  
X Ray ◽  
Antimicrobial Performance

In this study, zinc oxide nanoparticles (nZnO) were synthesized, deposited, and successfully used for surface modification of cotton to enhance antimicrobial properties. An in situ ultrasonic acoustic method was applied to anchor nZnO on cotton. The results of scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction confirmed the presence of nZnO on cotton. A homogenous distribution of nZnO with an average particle size 27.4 nm was found during the analysis of results. Antimicrobial performance of cotton-nZnO (C-nZnO) composites was evaluated against Gram-negative and Gram-positive microbes. The deposited amount of nZnO on C-nZnO composites was determined by volumetric titration through inductive couple plasma atomic emission spectroscopy. C-nZnO composites showed excellent antimicrobial performance especially against both Staphylococcus aureus (Gram-positive) and Escherichia coli. The durability and stability of C-nZnO composites were tested against leaching and washing. No significant fluctuation was found on deposited amount of nZnO before and after washing test for optimized sample. The results demonstrate that synthesized C-nZnO composite samples can be used as an alternative for antimicrobial bandages.

scholarly journals Biosynthesis Microwave-Assisted of Zinc Oxide Nanoparticles with ZiziphusJujuba Leaves Extract: Characterization and Photocatalytic Application

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1682
Author(s):  
Maymounah N. Alharthi ◽  
Iqbal Ismail ◽  
Stefano Bellucci ◽  
Nezar H. Khdary ◽  
Mohamed Abdel Salam
Keyword(s):  
Zinc Oxide ◽  
Photocatalytic Degradation ◽  
Zinc Oxide Nanoparticles ◽  
Average Particle Size ◽  
Solar Irradiation ◽  
Oxide Nanoparticles ◽  
Average Particle ◽  
Zno Nps ◽  
Microwave Assisted ◽  
Photocatalytic Application

The present work is intended to biosynthesize zinc oxide nanoparticles (ZnO NPs) via facile and modern route using aqueous Ziziphus jujuba leaves extract assisted by microwave and explore their photocatalytic degradation of methyl orange anionic dye and methylene blue cationic dye under solar irradiation. The biosynthesized microwave assisted ZnO NPs were characterized and the results showed that ZnO NPs contain hexagonal wurtzite and characterized with a well-defined spherical-like shape with an outstanding band gap (2.70 eV), average particle size of 25 nm and specific surface area of 11.4 m2/g. The photocatalytic degradation of the MO and MB dyes by biosynthesized ZnO NPs under solar irradiation was studied and the results revealed the selective nature of the ZnO NPs for the adsorption and further photocatalytic degradation of the MO dye compared to the MB dye. In addition, the photocatalytic degradation of MO and MB dyes by the ZnO NPs under solar radiation was fitted by the first-order kinetics. Moreover, the photodegradation mechanism proposed that superoxide ions and hydroxyl radicals are the main reactive species.

scholarly journals Synthesis of Zinc Oxide Nanoparticles Using Rubus fairholmianus Root Extract and Their Activity against Pathogenic Bacteria

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 3029
Author(s):  
Naresh Kumar Rajendran ◽  
Blassan P. George ◽  
Nicolette N. Houreld ◽  
Heidi Abrahamse
Keyword(s):  
Zinc Oxide ◽  
Antibacterial Activity ◽  
Zinc Oxide Nanoparticles ◽  
Pathogenic Bacteria ◽  
Average Particle Size ◽  
Oxide Nanoparticles ◽  
Root Extract ◽  
Average Particle ◽  
Zno Nps ◽  
Promising Alternative

Recently, the biosynthesis of zinc oxide nanoparticles (ZnO NPs) from crude extracts and phytochemicals has attracted much attention. Green synthesis of NPs is cost-effective, eco-friendly, and is a promising alternative for chemical synthesis. This study involves ZnO NPs synthesis using Rubus fairholmianus root extract (RE) as an efficient reducing agent. The UV spectrum of RE-ZnO NPs exhibited a peak at 357 nm due to intrinsic bandgap absorption and an XRD pattern that matches the ZnO crystal structure (JCPDS card no: 36-1451). The average particle size calculated from the Debye–Scherrer equation is 11.34 nm. SEM analysis showed that the RE-ZnO NPs spherical in shape with clusters (1–100 nm). The antibacterial activity of the NPs was tested against Staphylococcus aureus using agar well diffusion, minimum inhibitory concentration, and bacterial growth assay. The R. fairholmianus phytochemicals facilitate the synthesis of stable ZnO NPs and showed antibacterial activity.

scholarly journals Controlling the structural properties of pure and aluminum doped zinc oxide nanoparticles by annealing

2020 ◽  
Vol 32 (1) ◽  
pp. 1074-1080 ◽  
Author(s):  
A. Narjis ◽  
H. El Aakib ◽  
M. Boukendil ◽  
M. El Hasnaoui ◽  
L. Nkhaili ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Structural Properties ◽  
Zinc Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Aluminum Doped Zinc Oxide

Efficient absorption of H2S by aluminum doped zinc oxide nanoparticles

2012 ◽  
Vol 78 ◽  
pp. 188-191 ◽  
Author(s):  
Saeed Parhoodeh ◽  
Morteza Zargar Shoushtari ◽  
Mansoor Farbod
Keyword(s):  
Zinc Oxide ◽  
Zinc Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Aluminum Doped Zinc Oxide

scholarly journals Polyphenol Enriched Extract of Pomegranate Peel; A Novel Precursor for the Biosynthesis of Zinc Oxide Nanoparticles and Application in Sunscreens

2020 ◽  
Vol 27 (1) ◽  
pp. 102-110
Author(s):  
Maryam Kokabi ◽  
Samad Nejad Ebrahimi
Keyword(s):  
Antioxidant Activity ◽  
Zinc Oxide ◽  
Ir Spectroscopy ◽  
Zinc Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Zno Nps ◽  
Pomegranate Peel ◽  
Ft Ir ◽  
Oil Emulsions ◽  
Ft Ir Spectroscopy

Background: Green synthesized nanoparticles (NPs) from agricultural wastes is an area of great interest due to it is eco-friendly and profitable. Zinc oxide is an inorganic UV-filter commonly used as UV-blocker in a different industry. Methods: Zinc oxide nanoparticles (ZnO NPs) were successfully biosynthesized using Zn(NO3)2 as a substrate by polyphenol enriched fraction (PEF) of pomegranate peel. The biological activity of ZnO NPs was evaluated using MBC and MIC tests for antibacterial and DPPH assay for antioxidant potential. Sunscreen potential of NPs was determined after applying them in water-in-oil emulsions. Results: UV-Vis and FT-IR spectroscopy techniques confirmed the formation of ZnO NPs. FE-SEM characterized the morphology and purity of the biosynthesized NPs with EDAX and XRD data. The average crystalline size of ZnO NPs was found to be 22 nm. FT-IR spectroscopy revealed the role of phenolic compounds in the formation and stability of ZnO NPs. The antibacterial activity of PEF and its biosynthesized ZnO was evaluated against Staphylococcus aureus and Escherichia coli. The prepared NPs showed a higher antibacterial effect than the commercial ZnO NPs. Interestingly, the antioxidant activity was also detected for obtained NPs. The PEF powder also exhibited higher antibacterial and antioxidant activity than the standards. Furthermore, the in vitro sun protection factors were estimated after applying NPs in water-in-oil emulsions. Conclusion: This study highlighted the possibility of using PEF of pomegranate peel for the biosynthesis of ZnO NPs as well as applying its NPs in sunscreens to achieve a safe alternative to harmful chemical UV-filters commonly used in cosmetics.

Plant Mediated Synthesis of Zinc Oxide Nanoparticles and Evaluation of Its Anti - microbial and Anti - oxidant Activities

2021 ◽  
Vol 1 (30) ◽  
pp. 67-74
Author(s):  
Prashast Kumar Tripathi Satish Chandra Sati
Keyword(s):  
Zinc Oxide ◽  
Zinc Oxide Nanoparticles ◽  
Cost Effective ◽  
Oxide Nanoparticles ◽  
E Coli ◽  
Good Shape ◽  
Anti Oxidant ◽  
Ft Ir ◽  
Microbial Assay ◽  
Average Size

Abstract-In this research paper we have reported the single pot synthesis of zinc oxide nanoparticles (ZnONPs) for the first time by utilisation of leaves extract of Himalayan medicinal plant Artemisia roxburghiana. The principle of green chemistry was utilised at maximum possible level to make the synthesis not only environmentally compatible but also cost effective. The obtained nanoparticles are of good shape and size as confirmed by the instrumental techniques such as Powder XRD, HR-TEM, HR-SEM and FT-IR. The average size of the synthesized nanoparticles was between 26 to 35 nm. These nanoparticles then screened for the anti - microbial assay in which it has shown positive activity against E. coli, A. Tereus and C. falcatum. The second application of the synthesized nanoparticles is estimation of anti - oxidant activity against the DPPH. The IC value of the nanoparticles is formed to be 50 53 in EtoH while that of the standard, ascorbic acid was 26 in the same solvent. Keywords:Art emisia roxburghiana, Asteraceae, ZnONPs, Antimicrobial activity and Antioxidant activity

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