Facile Green Synthesis of LaCe Co-Doped ZnO Nanoparticles and Their Structural, Optical and Antibacterial Properties

This present work describes the synthesis of LaCe co-doped zinc oxide (ZnO) nanoparticles (NPs) prepared by green method using Gymnema sylvestre (G. sylvestre) leaves as reducing as well as capping agent. Green synthesis method avoids inert gases, high pressure, laser radiation, high temperature, toxic chemicals etc. as compared to conventional method like sol-gel technique method, laser ablation method, solvothermal method, inert gas condensation method and chemical reduction method. The synthesized LaCe co-doped ZnO NPs was characterized by X-Ray diffraction (XRD), field emission scanning electron microscopy (FESEM), elemental analysis (EADX), Fourier transform infrared spectroscopy (FTIR), UV-vis spectroscopy and photoluminescence (PL). The LaCe co-doped ZnO NPs was tested against clinical pathogens such as gram positive G+ (Staphylococcus aureus and Streptococcus pneumoniae) and gram negative G- (Klebsiella pneumoniae, Shigella sydenteriae, Escherichia coli, Pseudomonas aeruginosa and Protus vulgaris) bacterial strains using agar well diffusion method.

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Hydrogen Sensing Properties of Co-Doped ZnO Nanoparticles

Chemosensors ◽

10.3390/chemosensors6040061 ◽

2018 ◽

Vol 6 (4) ◽

pp. 61 ◽

Cited By ~ 6

Author(s):

Fatemeh Moosavi ◽

Mohammad Ebrahim Bahrololoom ◽

Ramin Kamjou ◽

Ali Mirzaei ◽

Salvatore Gianluca Leonardi ◽

...

Keyword(s):

Zno Nanoparticles ◽

High Performance ◽

Gas Sensing ◽

Sol Gel ◽

Breath Hydrogen ◽

Zno Nps ◽

Sensing Properties ◽

Co Doping ◽

Doped Zno ◽

Co Doped

In this study, the gas sensing properties of Co-doped ZnO nanoparticles (Co-ZnO NPs) synthesized via a simple sol-gel method are reported. The microstructure and morphology of the synthesized Co-ZnO NPs were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. Co-ZnO NPs were then used for developing a conductometric gas sensor for the detection, at mild temperature, of low concentration of hydrogen (H2) in air. To evaluate the selectivity of the sensor, the sensing behavior toward some VOCs such as ethanol and acetone, which represent the most important interferents for breath hydrogen analysis, was also investigated in detail. Results reported demonstrated better selectivity toward hydrogen of the Co-ZnO NPs sensor when compared to pure ZnO. The main factors contributing to this behavior, i.e., the transition from n-type behavior of pristine ZnO to p-type behavior upon Co-doping, the modification of oxygen vacancies and acid-base characteristics have been considered. Hence, this study highlights the importance of Co doping of ZnO to realize a high performance breath hydrogen sensor.

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Enhanced Photocatalytic Activity of ZnO Nanoparticles Co-Doped With Rare Earth Elements (Nd and Sm) Under UV Light Illumination

10.21203/rs.3.rs-1026552/v1 ◽

2021 ◽

Author(s):

P. Baskaran ◽

A. Pramothkumar ◽

Mani P

Keyword(s):

Photocatalytic Activity ◽

Zno Nanoparticles ◽

Dye Degradation ◽

Uv Light ◽

Present Report ◽

Precipitation Method ◽

Light Illumination ◽

Zno Nps ◽

Doped Zno ◽

Co Doped

Abstract In the present report, synthesis of pure, Nd-doped (1 wt.%) and Nd/Sm (1 wt.%) co-doped Zinc Oxide (ZnO) Nanoparticles (NPs) by using simple co-precipitation method. PXRD pattern of all the synthesized samples exposes the hexagonal crystal structure of ZnO NPs without any impurity. The various functional groups presented in the synthesized samples were analyzed by FT-IR studies. From UV-Vis DRS spectra, the band gap was found to be 2.81 eV, 2.90 and 3.10 eV respectively for pure, Nd-doped and Nd-Sm co-doped ZnO NPs. PL spectrum displays the broad emission at 393and 450 nm for all the synthesized samples. The agglomeration of flower-like morphology of pure ZnO NPs, flake-like structure of Nd-doped and rod-like morphology of Nd/Sm co-doped ZnO NPs were examined by SEM. Photocatalytic activity of the prepared samples for dye degradation of Acid Orange 7 (AO-7) and Acid Red 13 (AR-13) was studied under UV light. The result revealed that, the Nd/Sm co-doped ZnO NPs found to have efficient degradation candidate materials.

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Optical and Structural Investigation of Mg2+ doped ZnO Nanoparticles using Gymnema sylvestre and Mangifera indica Leaves Extracts

Journal of Nanoscience and Technology ◽

10.30799/jnst.205.19050107 ◽

2019 ◽

Vol 5 (1) ◽

pp. 607-609

Author(s):

M. Karthikeyan . ◽

A. Jafar Ahamed . ◽

P. Vijaya Kumar .

Keyword(s):

Zno Nanoparticles ◽

Structural Investigation ◽

Mangifera Indica ◽

Gymnema Sylvestre ◽

X Ray Diffraction ◽

Zno Nps ◽

Synthesis Of Nanoparticles ◽

Vis Spectroscopy ◽

Doped Zno ◽

Physical And Chemical

In green nanotechnology, plant is used for the synthesis of nanoparticles which are gaining considerable interest among researchers as an eco-friendly alternative to conventional physical and chemical methods, as this approach eliminates the use of toxic chemicals. The present study describes the synthesis of Mg2+ (magnesium) doped zinc oxide (ZnO) nanoparticles (NPs) M1 using leaves extract of Gymnema sylvestre (G. sylvestre) belonging to Asclepiadaceae family and M2 using Mangifera indica (M. indica) belonging to Anacardiaceae family as reducing as well as capping agents. The obtained Mg2+ doped ZnO NPs (M1 and M2) were characterized by X-ray diffraction (XRD) studies, field emission scanning electron microscopy (FESEM), elemental analysis (EDAX), Fourier transform infrared spectroscopy (FTIR), UV-vis spectroscopy and photoluminescence (PL) spectra.

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ROOM TEMPERATURE FERROMAGNETISM IN Co-DOPED ZnO NANOPARTICLES: MILLING TIME DEPENDENCE AND ANNEALING EFFECT

International Journal of Nanoscience ◽

10.1142/s0219581x11007697 ◽

2011 ◽

Vol 10 (01n02) ◽

pp. 307-311 ◽

Cited By ~ 3

Author(s):

BAPPADITYA PAL ◽

P. K. GIRI

Keyword(s):

Zno Nanoparticles ◽

Room Temperature ◽

Room Temperature Ferromagnetism ◽

Near Band Edge ◽

Band Edge Emission ◽

Magnetic Impurities ◽

Zno Nps ◽

Small Magnitude ◽

Doped Zno ◽

Co Doped

We report on the occurrence of room temperature ferromagnetism in Co -doped ZnO nanoparticles (NPs). Doping is performed by ball milling of 3 wt% of Co mixed with ZnO nanopowders (commercial) for durations of 2–8 h. X-ray diffraction data and high-resolution transmission electron microscopy (HRTEM) confirm the absence of metallic Co clusters or any other phase different from würtzite-type ZnO . The magnetization (M–H curve) measured at room temperature exhibits the clear ferromagnetic characteristic with saturation magnetization (Ms) and coercive field (Hc) of the order of 3–4 emu/g and 225 Oe, respectively. Post-growth annealing at 250°C results in an increase of Ms by a small magnitude, while annealing at 500°C results in reduction of Ms. UV–visible absorption spectra show small redshift in the absorption peaks in the Co -doped ZnO NPs due to the incorporation of Co atoms in ZnO lattice. Room temperature photoluminescence studies show enhanced near-band-edge emission at 378 nm in the doped NPs as compared to the undoped NPs indicating low density of defects in the doped ZnO crystals. Contribution of intrinsic defects and magnetic impurities in the observed ferromagnetism is discussed.

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Co-doped ZnO nanoparticles synthesized by an adapted sol–gel method: effects on the structural, optical, photocatalytic and antibacterial properties

Journal of Sol-Gel Science and Technology ◽

10.1007/s10971-014-3310-z ◽

2014 ◽

Vol 72 (2) ◽

pp. 301-309 ◽

Cited By ~ 42

Author(s):

Michele Karoline Lima ◽

Daniela Martins Fernandes ◽

Marcela Fernandes Silva ◽

Mauro Luciano Baesso ◽

Antonio Medina Neto ◽

...

Keyword(s):

Zno Nanoparticles ◽

Sol Gel ◽

Antibacterial Properties ◽

Gel Method ◽

Sol Gel Method ◽

Method Effects ◽

Doped Zno ◽

Co Doped

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GREEN SYNTHESIS OF SILVER NANOPARTICLES FROM FRUIT RIND EXTRACT OF GARCINIA MANGOSTANA L. AND EVALUATION OF ANTIBACTERIAL PROPERTIES

PLANT ARCHIVES ◽

10.51470/plantarchives.2021.v21.no2.043 ◽

2021 ◽

Vol 21 (2) ◽

Author(s):

Manju Madhavan ◽

Elsa Rose P.J. ◽

Arunima Francis ◽

Grace Maria Benny ◽

Anila Wilson

Keyword(s):

Silver Nanoparticles ◽

Green Synthesis ◽

Wave Length ◽

Antibacterial Properties ◽

Antibacterial Activities ◽

Diffusion Method ◽

Toxic Substances ◽

Garcinia Mangostana ◽

Vis Spectroscopy ◽

Fruit Rind

Nanotechnology is an emerging area of science that involves the engineering of nano sized particles of various materials. Among the various nanoparticles, the silver nanoparticles are used in various applications due to their unique characters. The production of silver nanoparticles using a chemical method is harmful and produces toxic substances as by-products, so the aim of our study was to green synthesis silver nanoparticles using the fruit rind of Garcinia mangostana L. which is being discarded as a waste material. Aqueous rind extract of G. mangostana was prepared and synthesis of silver nanoparticles was analysed by UV-Vis spectrophotometer by optimizing various parameters like pH, time and concentration of extract. The nanoparticles were characterized using UV-Vis spectroscopy and the peak was obtained between the wave length of 410 - 433 nm in various treatments. The antibacterial activities of synthesized silver nanoparticles were tested against both gram negative (Pseudomonas) and gram positive (Staphylococcus) bacteria using the well diffusion method. The aqueous extract shows the remarkable zone of inhibition against Pseudomonas and Staphylococcus.

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Fe-Doped ZnO Nanoparticles: Structural, Morphological, Antimicrobial and Photocatalytic Characterization

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1143.233 ◽

2017 ◽

Vol 1143 ◽

pp. 233-239 ◽

Cited By ~ 2

Author(s):

Viorica Mușat ◽

Mariana Ibănescu ◽

Dana Tutunaru ◽

Florentina Potecaşu

Keyword(s):

Zno Nanoparticles ◽

Uv Light ◽

Precipitation Method ◽

X Ray Diffraction ◽

Zno Nps ◽

Oxide Semiconductors ◽

Mueller Hinton ◽

Vis Spectroscopy ◽

Mueller Hinton Agar ◽

Doped Zno

Oxide semiconductors have attracted increasing interest due to their potential in solving environmental problems. ZnO-based nanoparticles (NPs) are among the most investigated for efficient disinfection and microbial control.Iron-doped zinc oxide nanoparticles (Fe:ZnO NPs) were successfully fabricated through precipitation method at low temperature followed by thermal treatment. The obtained Fe:ZnO NPs were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and ultraviolet-visible (UV–Vis) spectroscopy. The effect of iron content on structural, morphological, antimicrobial and photocatalytic properties was investigated and discussed.The photocatalytic activity of the nanoparticles was tested by degradation of methylene blue (MB) solution under UV light for 60 min irradiation. The antibacterial activity was determined by paper disc method on Mueller-Hinton agar against the Gram-negative bacteria Escherichia coli (E. coli) and the Gram-positive bacteria Staphylococcus aureus (S. aureus) and compared to that of the undoped ZnO NPs. Consistent improvement on the photocatalytic and antimicrobial activity of Fe-doped ZnO nanoparticles was noticed.

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Electrochemical Sensing of Dopamine and Antibacterial Properties of ZnO Nanoparticles Synthesized from Solution Combustion Method

International Journal of Nanoscience ◽

10.1142/s0219581x15500052 ◽

2015 ◽

Vol 14 (03) ◽

pp. 1550005 ◽

Cited By ~ 11

Author(s):

K. Manjunath ◽

K. Lingaraju ◽

D. Kumar ◽

H. Nagabhushan ◽

D. Samrat ◽

...

Keyword(s):

Zno Nanoparticles ◽

Quantum Confinement Effect ◽

Antibacterial Properties ◽

Combustion Method ◽

Electrochemical Sensing ◽

Diffusion Method ◽

Solution Combustion ◽

Zno Nps ◽

Solution Combustion Method ◽

Strong Absorption Band

We have successfully synthesized ZnO nanoparticles (NPs) from solution combustion method using combustible fuel (Green gram). XRD pattern confirms that the prepared compound is composed of wurtzite hexagonal zinc-oxide. FTIR spectrum of ZnO NPs shows the band at ~ 417 cm-1 associated with the characteristic vibration of Zn - O . The UV-Vis spectrum shows a strong absorption band at ~ 365 nm which is blue shifted due to quantum confinement effect. TEM images show the average sizes of the nanoparticles are found to be almost ~ 15–30 nm. The as-synthesized product shows good electrochemical sensing of dopamine. Furthermore the antibacterial properties of ZnO NPs were investigated by their bactericidal activity against four bacterial strains using the agar well diffusion method.

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Photoluminescence and Magnetic Properties of Undoped and (Mn, Co) co-doped ZnO Nanoparticles

Current Nanoscience ◽

10.2174/1573413715666191010162626 ◽

2020 ◽

Vol 16 (4) ◽

pp. 655-666

Author(s):

Mona Rekaby

Keyword(s):

Magnetic Properties ◽

Zno Nanoparticles ◽

Room Temperature ◽

Magnetic Measurements ◽

Structural Defects ◽

Ferromagnetic Behavior ◽

Secondary Phases ◽

Antiferromagnetic Ordering ◽

Doped Zno ◽

Co Doped

Objective: The influence of Manganese (Mn2+) and Cobalt (Co2+) ions doping on the optical and magnetic properties of ZnO nanoparticles was studied. Methods: Nanoparticle samples of type ZnO, Zn0.97Mn0.03O, Zn0.96Mn0.03Co0.01O, Zn0.95Mn0.03 Co0.02O, Zn0.93Mn0.03Co0.04O, and Zn0.91Mn0.03Co0.06O were synthesized using the wet chemical coprecipitation method. Results: X-ray powder diffraction (XRD) patterns revealed that the prepared samples exhibited a single phase of hexagonal wurtzite structure without any existence of secondary phases. Transmission electron microscope (TEM) images clarified that Co doping at high concentrations has the ability to alter the morphologies of the samples from spherical shaped nanoparticles (NPS) to nanorods (NRs) shaped particles. The different vibrational modes of the prepared samples were analyzed through Fourier transform infrared (FTIR) measurements. The optical characteristics and structural defects of the samples were studied through Photoluminescence (PL) spectroscopy. PL results clarified that Mn2+ and Co2+ doping quenched the recombination of electron-hole pairs and enhanced the number of point defects relative to the undoped ZnO sample. Magnetic measurements were carried out at room temperature using a vibrating sample magnetometer (VSM). (Mn, Co) co-doped ZnO samples exhibited a ferromagnetic behavior coupled with paramagnetic and weak diamagnetic contributions. Conclusion: Mn2+ and Co2+ doping enhanced the room temperature Ferromagnetic (RTFM) behavior of ZnO. In addition, the signature for antiferromagnetic ordering between the Co ions was revealed. Moreover, a strong correlation between the magnetic and optical behavior of the (Mn, Co) co-doped ZnO was analyzed.

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