scholarly journals Investigation of structural and optical properties of biosynthesized Zincite (ZnO) nanoparticles (NPs) via an aqueous extract of Rosmarinus officinalis (rosemary) leaves

MRS Advances ◽  
2020 ◽  
Vol 5 (45) ◽  
pp. 2349-2358 ◽  
Author(s):  
S. K. Noukelag ◽  
H.E.A. Mohamed ◽  
B. Moussa ◽  
L.C. Razanamahandry ◽  
S.K.O. Ntwampe ◽  
...  
Keyword(s):  
Aqueous Extract ◽  
Surface Defects ◽  
High Surface ◽  
Average Particle Size ◽  
Zinc Nitrate ◽  
Attenuated Total Reflection ◽  
Average Particle ◽  
Nitrate Hexahydrate ◽  
Zno Nps ◽  
X Ray

AbstractBiosynthesized Zincite nanoparticles have been successfully demonstrated by a completely green process mediated aqueous extract of rosemary leaves acting as both reducing and stabilizing agents and zinc nitrate hexahydrate as the precursor. The synthesis was free of solvents and surfactants to adhere to green chemistry principles and the impartation of environmental benignity. To achieve our objective, structural and optical investigations of ZnO annealed at 500°C for 2hrs were carried-out using complementary techniques. High resolution transmission electron microscopy (HRTEM) revealed the self-assembled, highly agglomerated quasi-hexagonal shaped NPs and the average particle size was found to peak at 15.62 ± 0.22 nm. Selected area electron diffraction (SAED) and X-ray diffraction (XRD) exhibited several diffraction rings with clear diffraction spots confirming their polycrystallinity and the purity of ZnO NPs with a wurtzite structure. Furthermore, the energy dispersive X-ray spectroscopy (EDS) substantiated the presence of Zn and O in the sample and attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) illustrated the Zn-O chemical bonds. From UV-Vis-NIR, the optical band gap was amounted to 3.2 eV and photoluminescence (PL) emission spectrum to 2.9eV with high surface defects and oxygen vacancies. Through these results, the use of rosemary leaves extract is hereby shown to be a cost-effective and environmentally friendly alternative to synthesize Zincite nanoparticles (ZnO NPs).

scholarly journals Facile Microemulsion Synthesis of Vanadium-Doped ZnO Nanoparticles to Analyze the Compositional, Optical, and Electronic Properties

Materials ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 821 ◽  
Author(s):  
H.S. Ali ◽  
Ali Alghamdi ◽  
G. Murtaza ◽  
H.S. Arif ◽  
Wasim Naeem ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Average Particle Size ◽  
Xrd Analysis ◽  
Attenuated Total Reflection ◽  
Lattice Parameters ◽  
Average Particle ◽  
Structural Morphology ◽  
Wurtzite Phase ◽  
X Ray ◽  
Doped Zno

In this work, microemulsion method has been followed to synthesize vanadium-doped Zn1−xVxO (with x = 0.0, 0.02, 0.04, 0.06, 0.08, and 0.10) nanoparticles. The prepared samples are characterized by several techniques to investigate the structural, morphology, electronic, functional bonding, and optical properties. X-ray diffractometer (XRD) analysis confirms the wurtzite phase of the undoped and V-doped ZnO nanoparticles. Variation in the lattice parameters ensures the incorporation of vanadium in the lattice of ZnO. Scanning electron microscopy (SEM) shows that by increasing contents of V ions, the average particle size increases gradually. X-ray Absorption Near Edge Spectroscopy (XANES) at the V L3,2 edge, oxygen K-edge, and Zn L3,2 edge reveals the presence and effect of vanadium contents in the Zn host lattice. Furthermore, the existence of chemical bonding and functional groups are also asserted by attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). UV–Visible analysis shows that by increasing V+ contents, a reduction up to 2.92 eV in the energy band gap is observed, which is probably due to an increase in the free electron concentration and change in the lattice parameters.

Synthesis and Characterization of Graphene/Zinc Oxide Nanocomposites

2017 ◽  
Author(s):  
Nurettin Sezer ◽  
Adnan Ali ◽  
Muataz A. Atieh ◽  
Muammer Koc
Keyword(s):  
Zinc Oxide ◽  
Average Particle Size ◽  
Zinc Nitrate ◽  
Synthesis And Characterization ◽  
Average Particle ◽  
Nitrate Hexahydrate ◽  
Gravimetric Analysis ◽  
Impregnation Method ◽  
Materials Used

This study investigates the synthesis and characterization of graphene/zinc oxide nanocomposites. Wet impregnation method was employed for the synthesis. Firstly, graphene nanoplatelets and zinc nitrate hexahydrate were concurrently dispersed in ethanol and subjected to sonication for 1 h. Then, the dispersion was put in a furnace at 70 °C overnight. The paste was then collected and heated further up to 400 °C in air for a duration of 4 h. The process was proceeded to yield insoluble nanocomposites. The synthesis was followed by characterization of the nanocomposite samples by Field Emission Scanning Electron Microscopy (FESEM), X-Ray Diffraction (XRD) and Thermal Gravimetric Analysis (TGA). The XRD pattern revealed the presence of ZnO crystals and graphene. The FESEM images showed that ZnO crystals with average particle size of 30 nm are uniformly distributed on graphene surfaces. According to the TGA result, the content of nanocomposites is in good agreement with the materials used during synthesis.

On the Use of Moringa Oleifera Leaves Extract for the Biosynthesis of NiO and ZnO Nanoparticles

MRS Advances ◽  
2020 ◽  
Vol 5 (21-22) ◽  
pp. 1145-1155
Author(s):  
I. Ngom ◽  
N. M. Ndiaye ◽  
A. Fall ◽  
M. Bakayoko ◽  
B. D. Ngom ◽  
...  
Keyword(s):  
Moringa Oleifera ◽  
Diffuse Reflectance ◽  
Average Crystallite Size ◽  
Zinc Nitrate ◽  
Attenuated Total Reflection ◽  
Nitrate Hexahydrate ◽  
X Rays ◽  
Zno Nps ◽  
Moringa Oleifera Leaves ◽  
Nio Nps

ABSTRACTThis contribution reports on the biosynthesis of nickel oxide and zinc oxide nanoparticles (NiO-NPs & ZnO-NPs) via a natural extract from Moringa Oleifera leaves as an effective chelating and/or oxidizing/reduction agent of nickel nitrate hexahydrate and zinc nitrate hexahydrate. The structural and optical properties of these two types of semiconductors obtained in a similar procedure are investigated using X-rays Diffraction (XRD), Attenuated Total Reflection-Fourier Transform Infrared (ATR-FTIR), diffuse reflectance UV-Visible-NIR and Photoluminescence (PL) techniques. The structural analysis shows the formation of pure cubic NiO-NPs and pure wurtzite ZnO-NPs with an average crystallite size of 17.80 nm and 10.81 nm respectively. Their band gaps, calculated from the diffuse reflectance analysis were found to be 4.28 eV and 3.35 eV respectively.

Effect of pH on Zinc Oxide Powder Prepared by a Chemical Co-Precipitation Method

2010 ◽  
Vol 93-94 ◽  
pp. 691-694 ◽  
Author(s):  
Pusit Pookmanee ◽  
Issara Attaveerapat ◽  
Jiraporn Kittikul ◽  
Sukon Phanichphant
Keyword(s):  
Zinc Oxide ◽  
Average Particle Size ◽  
Ammonium Hydroxide ◽  
Zinc Nitrate ◽  
Oxide Powder ◽  
Precipitation Method ◽  
Average Particle ◽  
X Ray ◽  
Zinc Oxide Powder ◽  
Co Precipitation

Zinc oxide powder was prepared by a chemical co-precipitation method. Zinc nitrate and ammonium hydroxide were used as the starting precursors. The white precipitated powder was formed after adding ammonium hydroxide until the pH of final solution was 7-9. The powder was filtered and dried at 100 °C for 24h. The phase of zinc oxide powder was studied by X-ray diffractometer (XRD). Hexagonal single phase of zinc oxide was obtained without calcination step. The morphology of zinc oxide powder was investigated by scanning electron microscope (SEM). The particle was irregular in shape and highly agglomerated with an average particle size of 0.1 µm. The chemical composition of zinc oxide powder was determined by energy dispersive X-ray spectrometer (EDXS). The elemental composition of zinc oxide showed the characteristic X-ray energy value as follows: zinc of Lα = 1.012 keV, Kα = 8.630 keV and Kβ = 9.570 keV and oxygen of Kα = 0.525 keV, respectively.

scholarly journals Synthesis of ZnO Nanoparticles by Precipitation Method with Their Antibacterial Effect

2018 ◽  
Vol 16 (2) ◽  
pp. 117 ◽  
Author(s):  
Muhammad Fajri Romadhan ◽  
Nurgaha Edhi Suyatma ◽  
Fahim Muchammad Taqi
Keyword(s):  
Antimicrobial Activity ◽  
Particle Size ◽  
Average Particle Size ◽  
Spherical Shape ◽  
Xrd Analysis ◽  
Zinc Nitrate ◽  
Sem Analysis ◽  
Precipitation Method ◽  
Average Particle ◽  
Zno Nps

The aim of this study was to synthesize and characterize Zinc oxide nanoparticles (ZnO-NPs) prepared by precipitation method. Zinc nitrate and sodium hydroxide was used as starting materials with biopolymer pectin as capping agent. ZnO-NPs were synthesized at three levels of temperatures (60, 80 and 100 °C) without or with calcinations (500 °C). Particle size analyzer (PSA) analysis results showed that the samples without calcination (T60, T80 and T100) having an average particle size respectively 105.13, 78.53, and 76.43 nm, whereas at the samples by calcination (T60C, T80C and T100C) each have average particle size of 88.73, 44.30 and 543.77 nm. The results showed that preparation of ZnO-NPs by using heating at 80 °C followed with calcinations at 500 °C (T80C) produced the smallest size. T80C samples further were analyzed using XRD, SEM and the antimicrobial activity compared with the ZnO-NPs commercials. XRD analysis confirmed that ZnO-NPs were successfully obtained and have form of pure nanostructure. SEM analysis showed that ZnO-NPs obtained has a spherical shape. Furthermore, this ZnO-NPs (T80C) has a better antimicrobial activity compared than commercial ZnO-NPs in market.

scholarly journals ZnO Microflowers Grown by Chemical Bath Deposition: A Low-Cost Approach for Massive Production of Functional Nanostructures

Chemosensors ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 62
Author(s):  
Vincenzina Strano ◽  
Maria Grazia Greco ◽  
Enrico Ciliberto ◽  
Salvo Mirabella
Keyword(s):  
Chemical Bath Deposition ◽  
Low Cost ◽  
High Surface ◽  
High Surface Area ◽  
Zinc Nitrate ◽  
Nitrate Hexahydrate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Spheroidal Shape ◽  
Xrd Techniques

The massive production of nanostructures with controlled features and high surface area is a challenging and timely task in view of developing effective materials for sensing and catalysis. Herein, functional ZnO nanostructures, named microflowers (MFs) have been prepared by a facile and rapid chemical bath deposition. ZnO MFs show an intriguing sheets-composed spheroidal shape, with diameters in the range 0.2–2.5 µm, whose formation is achieved by a complexing action by F in an aqueous solution of zinc nitrate hexahydrate and hexamethylenetetramine. The evolution of the physical and structural properties of the material, following post-deposition thermal annealing, has been investigated by scanning electron microscopy (SEM), energy dispersive X-ray analyses (EDX), photoluminescence (PL) and X-ray diffraction (XRD) techniques. The effectiveness of ZnO MFs in UV detection has also been tested to account for the potentiality of these nanostructures.

scholarly journals Effect of Foliar Spray Application of Zinc Oxide Nanoparticles on Quantitative, Nutritional, and Physiological Parameters of Foxtail Millet (Setaria italica L.) under Field Conditions

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1559 ◽  
Author(s):  
Kolenčík ◽  
Ernst ◽  
Komár ◽  
Urík ◽  
Šebesta ◽  
...  
Keyword(s):  
Average Particle Size ◽  
Foxtail Millet ◽  
Foliar Spray ◽  
Physiological Parameters ◽  
Setaria Italica ◽  
Stress Index ◽  
Average Particle ◽  
Crop Water Stress Index ◽  
Zno Nps ◽  
X Ray

It has been shown that the foliar application of inorganic nano-materials on cereal plants during their growth cycle enhances the rate of plant productivity by providing a micro-nutrient source. We therefore studied the effects of foliarly applied ZnO nanoparticles (ZnO NPs) on Setaria italica L. foxtail millet’s quantitative, nutritional, and physiological parameters. Scanning electron microscopy showed that the ZnO NPs have an average particle size under 20 nm and dominant spherically shaped morphology. Energy dispersive X-ray spectrometry then confirmed ZnO NP homogeneity, and X-ray diffraction verified their high crystalline and wurtzite-structure symmetry. Although plant height, thousand grain weight, and grain yield quantitative parameters did not differ statistically between ZnO NP-treated and untreated plants, the ZnO NP-treated plant grains had significantly higher oil and total nitrogen contents and significantly lower crop water stress index (CWSI). This highlights that the slow-releasing nano-fertilizer improves plant physiological properties and various grain nutritional parameters, and its application is therefore especially beneficial for progressive nanomaterial-based industries.

scholarly journals Thermal, Structural, and Physical Properties of Freeze Dried Tropical Fruit Powder

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
K. A. Athmaselvi ◽  
C. Kumar ◽  
M. Balasubramanian ◽  
Ishita Roy
Keyword(s):  
Particle Size ◽  
Physical Properties ◽  
Average Particle Size ◽  
Average Particle ◽  
X Ray Diffraction ◽  
Tropical Fruit ◽  
X Ray ◽  
Freeze Dried ◽  
Fruit Powder ◽  
Lcr Meter

This study evaluates the physical properties of freeze dried tropical (guava, sapota, and papaya) fruit powders. Thermal stability and weight loss were evaluated using TGA-DSC and IR, which showed pectin as the main solid constituent. LCR meter measured electrical conductivity, dielectric constant, and dielectric loss factor. Functional groups assessed by FTIR showed presence of chlorides, and O–H and N–H bonds in guava, chloride and C–H bond in papaya, and chlorides, and C=O and C–H bonds in sapota. Particle size and type of starch were evaluated by X-ray diffraction and microstructure through scanning electronic microscopy. A semicrystalline profile and average particle size of the fruit powders were evidenced by X-ray diffraction and lamellar/spherical morphologies by SEM. Presence of A-type starch was observed in all three fruits. Dependence of electric and dielectric properties on frequency and temperature was observed.

Synthesis of Supergrowth VACNTs and Nanostructured ZnO by Immerse Method

2011 ◽  
Vol 312-315 ◽  
pp. 1044-1048
Author(s):  
Salina Muhamad ◽  
Abu Bakar Suriani ◽  
Mohamad Zainizan Sahdan ◽  
Anuar Ahmad ◽  
Yosri M. Siran ◽  
...  
Keyword(s):  
Crystal Orientation ◽  
Zinc Nitrate ◽  
Zinc Nitrate Hexahydrate ◽  
Nitrate Hexahydrate ◽  
X Ray Diffraction ◽  
Vertically Aligned Carbon Nanotubes ◽  
X Ray ◽  
Aligned Carbon Nanotubes ◽  
Vertically Aligned ◽  
Physical Changes

In this paper, the study of supergrowth VACNTs after being immersed in zinc oxide solution were presented. Vertically aligned carbon nanotubes (VACNTs) were first deposited on silicon with the orientation of [1 0 0] before being immersed in an aqueous solution of zinc nitrate hexahydrate and hexamethylenetetramine. Physical changes have been observed by scanning electron microscopy, SEM in the VACNTs, where the significant expansion of length of up to almost 0.8 mm was achieved after the immersion of 4.5 hr. The supergrowth of VACNTs was observed and analyzed by energy dispersive x-ray spectroscopy, EDX to substantiate the incorporation of CNTs and ZnO of the sample. Raman spectroscopy and x-ray diffraction, XRD were used to inspect the crystal orientation to support our findings.

Preparation ZnO nanoparticles with Different Concentration by Laser Ablation in Liquid

2021 ◽  
Vol 39 (1B) ◽  
pp. 197-202
Author(s):  
Ghufran S. Jaber ◽  
Khawla S. Khashan ◽  
Maha J. Abbas
Keyword(s):  
Particle Size ◽  
Laser Ablation ◽  
Laser Pulse ◽  
Laser Energy ◽  
Average Particle Size ◽  
Spherical Shape ◽  
Pulse Number ◽  
Average Particle ◽  
Zno Nps ◽  
Laser Ablation In Liquid

The effects of varying laser pulse numbers on the fabricated of ZnONPs by pulsed laser ablation in deionized water of Zn-metal are investigated. The Nd: YAG laser at energy 600mJ prepared three samples by change the laser pulse number (100, 150, and 200). The results were collected and examined using an electron scanning microscope, XRD – diffraction, and transmission electron microscope. The result revealed the colloidal spherical shape and the homogeneous composition of the ZnO NPs. The nanoparticles resulted in different concentrations and sized distributions by changing the pulse number of a laser. The average particle size and the mass concentration of particle size increase with an increasing number of laser pulses by fixed the laser energy.

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