scholarly journals Manganese-Doped Zinc Oxide Nanostructures as Potential Scaffold for Photocatalytic and Fluorescence Sensing Applications

Chemosensors ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 120
Author(s):  
Deepika Thakur ◽  
Anshu Sharma ◽  
Abhishek Awasthi ◽  
Dharmender Singh Rana ◽  
Dilbag Singh ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Zno Nanostructures ◽  
Zinc Oxide Nanostructures ◽  
Fluorescence Sensing ◽  
X Ray ◽  
Sensing Applications ◽  
Oxide Nanostructures ◽  
Vis Spectroscopy ◽  
Doped Zno ◽  
Mn Doped

Herein, we report the photocatalytic and fluorescence sensing applications of manganese-doped zinc oxide nanostructures synthesized by a solution combustion technique, using zinc nitrate as an oxidizer and urea as a fuel. The synthesized Mn-doped ZnO nanostructures have been analyzed in terms of their surface morphology, phase composition, elemental analysis, and optical properties with the help of scanning electron microscopy (SEM), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), and UV-Visible (UV-Vis) spectroscopy. A careful observation of the SEM micrograph reveals that the synthesized material was porous and grown in very high density. Due to a well-defined porous structure, the Mn-doped ZnO nanostructures can be used for the detection of ciprofloxacin, which was found to exhibit a significantly low limit of detection (LOD) value i.e., 10.05 µM. The synthesized Mn-doped ZnO nanostructures have been further analyzed for interfering studies, which reveals that the synthesized sensor material possesses very good selectivity toward ciprofloxacin, as it detects selectively even in the presence of other molecules. The synthesized Mn-doped ZnO nanostructures have been further analyzed for the photodegradation of methyl orange (MO) dye. The experimental results reveal that Mn-doped ZnO behaves as an efficient photocatalyst. The 85% degradation of MO has been achieved in 75 min using 0.15 g of Mn-doped ZnO nanostructures. The observed results clearly confirmed that the synthesized Mn-dopedZnO nanostructures are a potential scaffold for the fabrication of sensitive and robust chemical sensors as well as an efficient photocatalyst.

scholarly journals Characterization of Zinc oxide Nanostructures prepared by hydrothermal method with Antibacterial property

2019 ◽  
Vol 17 (42) ◽  
pp. 108-124
Author(s):  
Ibrahim Abdulkareem Ali
Keyword(s):  
Zinc Oxide ◽  
Antibacterial Activity ◽  
Crystallite Size ◽  
Annealing Temperature ◽  
Energy Gap ◽  
Antibacterial Property ◽  
Zno Nanostructures ◽  
Zinc Oxide Nanostructures ◽  
Oxide Nanostructures ◽  
Uv Visible

        In this study, Zinc oxide nanostructures were synthesized via a hydrothermal method by using zinc nitrate hexahydrate and sodium hydroxide as a precursor. Three different annealing temperatures were used to study their effect on ZnO NSs properties. The synthesized nanostructure was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Atomic force microscope (AFM), and Fourier Transform Infrared Spectroscopy (FTIR). Their optical properties were studied by using UV -visible spectroscopy. The XRD analysis confirms that all ZnO nanostructures have the hexagonal wurtzite structure with average crystallite size within the range of (30.59 - 34.52) nm. The crystallite size increased due to the incensement of annealing temperature. FESEM analysis indicates that ZnO has hexagonal shape of cylindrical pores, plate-like nanocrystals and Nanorods. AFM analysis shows that the average surface roughness of ZnO Nanostructures increases from 3.96 to 19.1 nm with the increase of annealing temperature. The FTIR peaks indicate successful preparation of ZnO Nanostructures. The FTIR method was used to analyses the chemical bonds which conformed the present of the Zn-O group in the region between (400-500) cm-1. The UV-visible showed a red shift in the absorption spectra related to the shift in the energy gap related to increase in the particle size.  the band gap energy has been calculated from the optical absorption spectra. The annealing process has been fond more effective on the value of energy gap. As the annealing temperature increases, the value of energy gap, increases as well; from (3.12to 3.22) eV. The prepared Nanostructure is used for antibacterial property. It shows strong antibacterial activity against S. aureus and P.aeuruginosa bacteria by the agar disc diffusion method. The white precipitate of ZnO NSs has superior antibacterial activity on gram-positive (S. aureus) than the gram-negative (P.aeuruginosa) bacteria.

Antibacterial Activities of Zinc Oxide Nanostructures with Different Structures

2019 ◽  
Vol 294 ◽  
pp. 36-41
Author(s):  
Rolen Brian P. Rivera ◽  
Melchor J. Potestas ◽  
Ma. Reina Suzette B. Madamba ◽  
Rey Y. Capangpangan ◽  
Bernabe L. Linog ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Sea Urchin ◽  
Inhibition Zone ◽  
Antibacterial Activities ◽  
The Other ◽  
Zno Nanostructures ◽  
Zinc Oxide Nanostructures ◽  
Sem Images ◽  
Structural Morphology ◽  
Oxide Nanostructures

We report on antibacterial activities of Zinc oxide (ZnO) with different structures. Fast furrier transform infrared spectroscopy ZnO nanostructures showed peaks in the range between 450–600 cm-1 indicating the successful growth through the presence of Zn-O stretching. On the other hand, impurities such as zinc complexes might be present due to the appearance of peaks at 1110 cm-1, 1390 cm-1 and 1506 cm-1. Furthermore, SEM images revealed that nanorods and sea-urchin like nanostructures are present in the produced ZnO nanostructures. Nanorods exhibit a better antibacterial response than the sea-urchin like structure. The change in structural morphology along with its purity has greatly influenced the area of bacterial inhibition zone during antibacterial testing.

Structural Evolution of Nickel Doped Zinc Oxide Nanostructures

2013 ◽  
Vol 1551 ◽  
pp. 47-52 ◽  
Author(s):  
Navendu Goswami ◽  
Anshuman Sahai
Keyword(s):  
Raman Spectroscopy ◽  
Zinc Oxide ◽  
Structural Evolution ◽  
Precipitation Method ◽  
Zinc Oxide Nanostructures ◽  
Ni Doping ◽  
Sem Images ◽  
Wurtzite Phase ◽  
Oxide Nanostructures ◽  
Doped Zno

ABSTRACTIn this article, structural evolution in nickel doped zinc oxide nanostructures is reported. The ZnO nanostructures are synthesized with 1-10% of Ni doping adopting a chemical precipitation method. The undoped and doped nanostructures thus prepared, were systematically investigated employing X-ray diffraction (XRD), transmission and scanning electron microscopy (TEM/SEM), Fourier transform infrared (FTIR) and micro-Raman spectroscopy (μRS). The identification of wurtzite phase and determination of lattice parameters of Ni doped ZnO nanocrystallites is ascertained through XRD analysis. TEM/SEM images reveal the structural alteration of ZnO with variation of Ni doping concentrations. The study of vibrational modes of nanostructures at different stages of structural transformation, as performed through FTIR and Raman spectroscopy, assist in deciphering the crucial role of Ni doping concentration in gradual evolution of nickel doped ZnO structure from nanoparticles to nanorods.

Characterization of Urea versus HMTA in the Preparation of Zinc Oxide Nanostructures by Solution-Immersion Method Grown on Gold-Seeded Silicon Substrate

2011 ◽  
Vol 364 ◽  
pp. 45-49 ◽  
Author(s):  
Azlinda Ab Azlinda ◽  
Zuraida Khusaimi ◽  
Saifollah Abdullah ◽  
Mohamad Rusop
Keyword(s):  
Zinc Oxide ◽  
Silicon Substrate ◽  
High Surface ◽  
High Surface Area ◽  
Zinc Nitrate ◽  
Nitrate Hexahydrate ◽  
Zno Nanostructures ◽  
Zinc Oxide Nanostructures ◽  
Immersion Method ◽  
Oxide Nanostructures

Zinc oxide (ZnO) nanostructures prepared by immersion method were successfully grown on gold-seeded silicon substrate using Zinc nitrate hexahydrate (Zn (NO3)2.6H2O) as a precursor, separately stabilized with non-toxic urea (CH4N2O) and hexamethylene tetraamine (HMTA). The effect of changing the stabilizer of ZnO solution on the crystal structure, morphology and photoluminescence properties of the resultant ZnO is investigated. X-ray diffraction of the synthesized ZnO shows hexagonal zincite structure. The morphology of the ZnO was characterized using Field Emission Scanning Electron Microscope (FESEM). The growth of ZnO using urea as stabilizer shows clusters of ZnO nanoflower with serrated broad petals were interestingly formed. ZnO in HMTA showed growth of nanorods. The structures has high surface area, is a potential metal oxide nanostructures to be develop for optoelectronic devices and chemical sensors. The formation of ZnO nanostructures is found to be significantly affected by the stabilizer.

Synthesis and Spectral Analysis of PVP Capped Zinc Oxide Nanostructures

2015 ◽  
Vol 1086 ◽  
pp. 75-78
Author(s):  
R. Kiruba ◽  
Solomon Jeevaraj A. Kingson
Keyword(s):  
Zinc Oxide ◽  
Chemical Precipitation ◽  
Hexagonal Structure ◽  
Spectroscopic Techniques ◽  
Photoluminescence Spectra ◽  
Zinc Oxide Nanostructures ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxide Nanostructures ◽  
Prepared Nanostructures

Monodispersed polyvinylpyrrolidone capped nanostructures of zinc oxide are prepared through chemical precipitation technique. The prepared nanostructures are characterized by XRD, SEM and Photoluminescence spectroscopic techniques. X-ray diffraction studies confirm the hexagonal structure of zinc oxide nanostructures. Nanostructures of the prepared zinc oxide are confirmed by SEM. The emission wavelength of PVP capped zinc oxide is found to be 551 nm using photoluminescence spectra.

Effect of Electric Field and Temperature in Electrochemical Dissolution and Deposition Process on Morphologies of ZnO Nanostructures

2015 ◽  
Vol 804 ◽  
pp. 30-33
Author(s):  
Buppachat Toboonsung
Keyword(s):  
Zinc Oxide ◽  
Electric Field ◽  
Room Temperature ◽  
Deposition Process ◽  
Deionized Water ◽  
Electrochemical Dissolution ◽  
Zno Nanostructures ◽  
Constant Voltage ◽  
Zinc Oxide Nanostructures ◽  
Oxide Nanostructures

Zinc oxide nanostructures were synthesized by an electrochemical dissolution and deposition process. The zinc plates were immerged in deionized water and used as two electrodes. The process was operated by applying the electric field of 10, 12.5, 25 and 50 V/cm, the constant voltage of 10 V and varied the temperatures from room temperature to 70 °C during 1 h. It was found that the electric field and temperature of electrolyte solution had affected to morphologies of ZnO NSs and were grown in forms of nanoflakes, nanoparticles and nanorods.

scholarly journals Synthesis and Characterization of Aluminum Doped Zinc Oxide Nanostructures via Hydrothermal Route

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
A. Alkahlout ◽  
N. Al Dahoudi ◽  
I. Grobelsek ◽  
M. Jilavi ◽  
P. W. de Oliveira
Keyword(s):  
Zinc Oxide ◽  
Blue Shift ◽  
Zinc Oxide Nanostructures ◽  
Hydrothermal Route ◽  
Molar Ratios ◽  
Oxide Nanostructures ◽  
Nitrate Precursor ◽  
Vis Spectroscopy ◽  
Aluminum Doped Zinc Oxide

Stable crystalline aluminum doped zinc oxide (AZO) nanopowders were synthesized using hydrothermal treatment processing. Three different aluminum precursors have been used. The Al-precursors were found to affect the morphology of the obtained nanopowders. AZO nanoparticles based on zinc acetate and aluminum nitrate have been prepared with different Al/Zn molar ratios. XRD investigations revealed that all the obtained powders have single phase zincite structure with purity of about 99%. The effect of aluminum doping ratio in AZO nanoparticles (based on Al-nitrate precursor) on structure, phase composition, and particle size has been investigated. The incorporation of Al in ZnO was confirmed by UV-Vis spectroscopy revealing a blue shift due to Burstein-Moss effect.

Synthesis of porous nitrogen doped zinc oxide nanostructures using a novel paper mediated template method and their photocatalytic study for dye degradation under natural sunlight

2018 ◽  
Vol 2 (1) ◽  
pp. 163-170 ◽  
Author(s):  
Gajanan Kale ◽  
Sudhir Arbuj ◽  
Ujjwala Kawade ◽  
Sunit Rane ◽  
Jalindar Ambekar ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Dye Degradation ◽  
Template Method ◽  
Zno Nanostructures ◽  
Zinc Oxide Nanostructures ◽  
Natural Sunlight ◽  
Nitrogen Doped ◽  
Oxide Nanostructures

A novel paper-mediated template technique for the synthesis of N-ZnO nanostructures.

scholarly journals Bio-mediated synthesis of ZnO nanostructures from Thymus Schimperi leaves extract and its antibacterial and photocatalytic activities

2020 ◽  
Vol 9 (1) ◽  
pp. 808-813
Keyword(s):  
Zinc Oxide ◽  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Scanning Electron Micrographs ◽  
Zinc Oxide Nanostructures ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxide Nanostructures ◽  
Photocatalytic Activities ◽  
Scanning Electron

In this work, zinc oxide nanostructures were synthesized from thymus schimperi leaves extract and ZnSO4.7H2O precursor, and antibacterial and photocatalytic activities were studied. The as-synthesized nanostructures were characterized by UV-Vis spectrophotometer, powder X-ray diffraction, Fourier transform infrared spectrophotometer and scanning electron microscopy. Powder X-ray diffraction patterns revealed that the as-synthesized zinc oxide was hexagonal wurtzite structure with no peaks from other phases or impurity. The maximum UV-Vis spectrum peak at about 255 nm also supports the evidence for the formation of zinc oxide nanostructures. The presence of functional groups on the surface of the nanostructures from the Fourier transform infrared spectrum exhibited that the phytochemicals play a key role in the formation of the nanostructures. The appearance of peak at 595cm-1 in the spectrum further corroborates the presence of zinc oxide in the sample. Scanning electron micrographs depict that there was mesh like nanostructures on the surface, which are likely to be convenient for catalytic application. The synthesized nanostructures inhibited the growth of both gram-positive and gram-negative bacteria, showing its biocidal property. Moreover, Congo red, which is one of the carcinogenic textile dyes, has been photodegraded by 83.33% at a pH of 6.5 due to the as-synthesized zinc oxide nanostructures indicating its potential application for waste water treatment.

scholarly journals Synthesis, characterization and evaluation of biological activities of manganese-doped zinc oxide nanoparticles

2017 ◽  
Vol 16 (10) ◽  
pp. 2331-2339 ◽  
Author(s):  
Shakeel Ahmad Khan ◽  
Sammia Shahid ◽  
Waqas Bashir ◽  
Sadia Kanwal ◽  
Ahsan Iqbal
Keyword(s):  
Zinc Oxide ◽  
Band Gap ◽  
Zno Nanoparticles ◽  
Butylated Hydroxytoluene ◽  
Total Phenolic ◽  
Spectroscopic Techniques ◽  
Antioxidant Power ◽  
X Ray ◽  
Doped Zno ◽  
Mn Doped

Purpose: To synthesize, characterize and investigate the antimicrobial properties of pure and manganese-doped zinc oxide nanoparticles.Method: Un-doped and manganese-doped zinc oxide (Mn-doped ZnO) nanoparticles were prepared using co-precipitation method. The synthesized Mn-doped ZnO  nanoparticles were characterized using energy-dispersive x-ray spectroscopy  (EDX), scanning electron microscopy (SEM), and x-ray diffraction (XRD)  spectroscopic techniques. Their band gap energies were measured with ultraviolet-visible (UVVis) spectroscopy, while their antioxidant properties were evaluated by ferric reducing antioxidant power (FRAP), DPPH radical-scavenging, ferric  thiocyanate (FTC) and total phenolic content (TPC) assays. The antimicrobial  activities of the nanoparticles against different bacterial strains were determined using agar diffusion method.Result: Results from XRD, SEM, EDX and UV-Vis analyses demonstrated  successful synthesis of undoped and Mn-doped ZnO nanoparticles as seen in their hexagonal, wurtzite structures. The un-doped and Mn-doped ZnO nanoparticles had average grain sizes of 16.72 nm and 17.5 nm, and band gap energies of 3.585 eV and 2.737 eV, respectively. Significant antibacterial activity was manifested by Mndoped ZnO against E. coli, S. aureus, Klebsiella and B. subtilis, with zones of inhibition (ZOIs) of 13 ± 0.09 mm, 14 ± 0.01 mm, 18 ± 0.07 mm and 20 ± 0.10 mm, respectively. The Mn-doped ZnO nanoparticles also exhibited effective and significant antioxidant potential relative to butylated hydroxytoluene (BHT) and un-doped ZnO nanoparticles.Conclusion: Mn-doped ZnO nanoparticles demonstrate significant antimicrobial and antioxidant activities. Thus, the preparation is a good candidate for further development into therapeutic formulations.Keywords: Mn-doped ZnO, Nanoparticles, Properties, Antioxidant, Antibacterial

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