Electrochemical study of Nickel Oxide (NiO) nanoparticles from cactus plant extract

MRS Advances ◽  
2020 ◽  
Vol 5 (21-22) ◽  
pp. 1095-1102 ◽  
Author(s):  
Henok Gebretinsae ◽  
Giday Welegergs ◽  
N. Matinise ◽  
M. Maaza ◽  
Z. Y. Nuru
Keyword(s):  
Nickel Oxide ◽  
Plant Extract ◽  
Average Crystallite Size ◽  
Cost Effective ◽  
X Ray Diffraction ◽  
Cyclic Voltammetric ◽  
Nanosized Powders ◽  
Cyclic Voltammetric Study ◽  
Reversible Redox ◽  
P Type

ABSTRACTP-type NiO powders with an average crystallite size of 16 nm as shown by x-ray diffraction analysis were produced via biosynthesis using cactus plant extract. SEM showed that the NiO powders consisted of particles with sizes in the 20-35 nm range. A cyclic voltammetric study of the NiO nanopowders showed a quasi-reversible redox processes with the NiO powder showing potential for pseudo capacitance. Through these findings the use of natural Cactus extracts is hereby shown to be a cost-effective and environmentally friendly alternative for preparing Nickel oxide nanosized powders that can be of use in a variety of energy storage applications.

Microstructural and Properties of P-type Nickel Oxide (NiO) Thin Films Deposited by RF Magnetron Sputtering

2018 ◽  
Vol 24 (8) ◽  
pp. 5866-5871 ◽  
Author(s):  
G Balakrishnan ◽  
J. S. Ram Vinoba ◽  
R Rishaban ◽  
S Nathiya ◽  
O. S. Nirmal Ghosh
Keyword(s):  
Thin Films ◽  
Magnetron Sputtering ◽  
Nickel Oxide ◽  
High Mobility ◽  
Rf Magnetron Sputtering ◽  
X Ray Diffraction ◽  
Glass Substrates ◽  
Type Semiconductor ◽  
P Type ◽  
Nio Films

Nickel oxide (NiO) thin films were deposited on glass substrates using the RF magnetron sputtering technique at room temperature. The Argon and oxygen flow rates were kept constant at 10 sccm and 5 sccm respectively. The films were annealed at various temperatures (RT-300 °C) and its influence on the microstructural, optical and electrical properties were investigated. The X-ray diffraction (XRD) investigation of NiO films indicated the polycrystallinity of the films with the (111), (200) and (220) reflections corresponding to the cubic structure of NiO films. The crystallite size of NiO films was in the range ~4–14 nm. The transmittance of the films increased from 20 to 75% with increasing annealed temperature. The optical band gap of the films was 3.6–3.75 eV range for the as-deposited and annealed films. The Hall effect studies indicated the p-type conductivity of films and the film annealed at 300 °C showed higher carrier concentration (N), high conductivity (σ) and high mobility (μ) compared to other films. These NiO films can be used as a P-type semiconductor material in the devices require transparent conducting films.

Size-Controlled Synthesis of MgO Nanoparticles and the Assessment of Their Bactericidal Capacity

2013 ◽  
Vol 1547 ◽  
pp. 135-140 ◽  
Author(s):  
Yarilyn Cedeño-Mattei ◽  
Myrna Reyes ◽  
Oscar Perales-Pérez ◽  
Félix R. Román
Keyword(s):  
Average Crystallite Size ◽  
Cost Effective ◽  
Controlled Synthesis ◽  
X Ray Diffraction ◽  
Mgo Nanoparticles ◽  
E Coli ◽  
Mechanism Of Inhibition ◽  
Crystallite Sizes ◽  
Nanoscale Mgo ◽  
Size Controlled

ABSTRACTThe present work focuses on the development of a reproducible and cost-effective size-controlled synthesis route for nanoscale MgO and the preliminary assessment of its bactericide capacity as a function of crystal size. Nanoscale MgO was produced through the thermal decomposition of Mg-carbonate hydrate precursor (hydromagnesite) synthesized in aqueous phase. The exclusive formation of the MgO phase, with an average crystallite size between 7 and 13 ± 1 nm, was evidenced by X-Ray Diffraction and HRTEM analyses. Fourier Transform – Infrared spectroscopy confirmed the evolution of the precursor into the desired MgO structure. The bactericidal tests were conducted by measuring the optical density at 600 nm of E. coli in presence of MgO nanoparticles of specific sizes. MgO nanocrystals with average crystallite sizes of 13nm inhibited bacterial growth up to 35% at 500 mg MgO/L. The mechanism of inhibition could be attributed to the formation of superoxide species on the MgO surface.

scholarly journals Negatively-Doped Single-Walled Carbon Nanotubes Decorated with Carbon Dots for Highly Selective NO2 Detection

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2509
Author(s):  
Namsoo Lim ◽  
Jae-Sung Lee ◽  
Young Tae Byun
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensors ◽  
Cost Effective ◽  
Single Walled Carbon Nanotubes ◽  
X Ray Diffraction ◽  
Single Walled Carbon ◽  
Sensor Applications ◽  
Transmission Electron ◽  
P Type ◽  
Walled Carbon Nanotubes

In this study, we demonstrated a highly selective chemiresistive-type NO2 gas sensor using facilely prepared carbon dot (CD)-decorated single-walled carbon nanotubes (SWCNTs). The CD-decorated SWCNT suspension was characterized using transmission electron microscopy (TEM), X-ray diffraction (XRD), and UV-visible spectroscopy, and then spread onto an SiO2/Si substrate by a simple and cost-effective spray-printing method. Interestingly, the resistance of our sensor increased upon exposure to NO2 gas, which was contrary to findings previously reported for SWCNT-based NO2 gas sensors. This is because SWCNTs are strongly doped by the electron-rich CDs to change the polarity from p-type to n-type. In addition, the CDs to SWCNTs ratio in the active suspension was critical in determining the response values of gas sensors; here, the 2:1 device showed the highest value of 42.0% in a sensing test using 4.5 ppm NO2 gas. Furthermore, the sensor selectively responded to NO2 gas (response ~15%), and to other gases very faintly (NO, response ~1%) or not at all (CO, C6H6, and C7H8). We propose a reasonable mechanism of the CD-decorated SWCNT-based sensor for NO2 sensing, and expect that our results can be combined with those of other researches to improve various device performances, as well as for NO2 sensor applications.

Eco-Friendly Approach for the Efficient Biosynthesis of Mg3(PO4)2 Nanoparticles Using Plant Extract of Ocimum sanctum

2018 ◽  
Vol 24 (8) ◽  
pp. 5514-5518 ◽  
Author(s):  
G Apsana ◽  
P. P George ◽  
N Devanna
Keyword(s):  
Plant Extract ◽  
Cost Effective ◽  
Green Technology ◽  
Magnesium Phosphate ◽  
Ocimum Sanctum ◽  
X Ray Diffraction ◽  
Chemical Route ◽  
X Ray ◽  
Production Stages ◽  
The Cost

The green technology clubbed with the microwave irradiation allows one to produce the products and to reduce the number of production stages without increasing the cost. In this article, magnesium phosphate nanoparticles were successfully synthesized via a simple green chemical route using plant extract of Ocimum sanctum L. in microwave assisted method and followed by annealing at the temperature of 700 °C. The crystal structure, morphologies, elemental composition and optical properties of synthesized magnesium phosphate nanoparticles were systematically characterized by powdered X-ray diffraction (PXRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray analysis (EDX), Fourier Transform Infrared spectroscopy (FTIR) and UV-Vis Spectroscopic analysis. The structure of the magnesium phosphate was found to be monoclinic with the particle size of 43 nm. We conclude that the synthesis of magnesium phosphate nanoparticles using Ocimum sanctum L as reducing and stabilizing agent is easy, cost-effective and eco-friendly.

Increasing the Photocatalytic Activity by Mechano-chemically Milling on Zn- Doped TiO2

2009 ◽  
Vol 1217 ◽  
Author(s):  
Chennan Li ◽  
Sesha Srinivasan ◽  
Paula Algarin ◽  
Nikolai Kislov ◽  
Ayala Phani ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Sol Gel ◽  
Average Crystallite Size ◽  
Cost Effective ◽  
Blue Shift ◽  
High Energy ◽  
Planetary Mill ◽  
Photocatalytic Decomposition ◽  
X Ray Diffraction ◽  
Quantum Size

AbstractThis paper pursed one new cost effective strategy to improve the photocatalytic activity of the sol-gel developed Zn doped TiO2 by mechano-chemically milling in high energy planetary mill. The results showed that the photocatlytic activity was improved two times due to the increase of the surface area and the decrease in average crystallite size at the same time after using the high energy ball milling. Kubelka-Munk spectra of pristine and ball milled samples revealed a blue shift from 3.2 eV to 3.35 eV, which may be because of the presence of quantum size effects. SEM microstructural investigations revealed variations in the surface morphology with different Zn doping concentrations in the TiO2-Xwt.% Zn nanoparticulates. EDS spectra of these samples confirmed the stoichiometric concentration of Zn. Other characterization including X-ray diffraction (XRD), BET surface and the photocatalytic decomposition were also studied and the results were in agreement with each other.

Evaluation of the Morphology and Magnetic Properties of Cr3+- Doped Ni-Zn Ferrites

2008 ◽  
Vol 591-593 ◽  
pp. 120-124
Author(s):  
Valmir José da Silva ◽  
P.T.A. Santos ◽  
Lucianna Gama ◽  
Ruth Herta Goldsmith Aliaga Kiminami ◽  
Daniel R. Cornejo ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Average Crystallite Size ◽  
Sintered Sample ◽  
X Ray Diffraction ◽  
Inverse Spinel ◽  
Nanosized Powders ◽  
X Ray ◽  
Zn Ferrite ◽  
Dry Pressing

This work involved a morphological, microstructural and magnetic characterization of nanosized powders and sintered samples of Ni-Zn ferrite doped with chromium. The effect of substituting Fe3+ for Cr3+ on the final characteristics of the powders and sintered samples was investigated. The Ni-Zn ferrite powders were prepared by combustion reaction using nitrates and urea as fuel, based on the concepts of propellant chemistry. The samples were uniaxially compacted by dry pressing (385 MPa) and sintered at 1200oC/2h, using a heating rate of 5°C/min. The Ni-Zn powders and compacted samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and the measures of their magnetic properties. The results revealed the formation of the cubic crystalline phase of the inverse spinel of Ni-Zn-Cr ferrite. The average crystallite size was 21 nm and 57 nm while the saturation magnetization was 47.0 and 73.1 emu/g for the powder and the sintered sample, respectively.

Nickel Oxide-incorporated Polyaniline/Polyvinyl Alcohol Composite for Enhanced Antibacterial Activity

2019 ◽  
Vol 233 (9) ◽  
pp. 1261-1274 ◽  
Author(s):  
Gul Rahman ◽  
Mansoor Khan ◽  
Zahid Khan ◽  
Anwar-ul-Haq Ali Shah ◽  
Muhammad Saleem Khan ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Polyvinyl Alcohol ◽  
Nickel Oxide ◽  
Antibacterial Agent ◽  
Composite Films ◽  
Cost Effective ◽  
Single Step ◽  
Bacterial Strains ◽  
X Ray Diffraction ◽  
E Coli

Abstract The development of biocompatible, cost effective and more efficient materials to control or inhibit the growth of microorganisms in necessary to fight against resistant microbes. Here, we demonstrate the synthesis of nickel oxide-incorporated polyaniline/polyvinyl alcohol (PANI/PVA/NiOx) composite material by single-step polymerization and its application as antibacterial agent. The composite films were characterized using UV-visible spectroscopy (UV-Vis), Thermogravimetric analysis (TGA), Fourier Transform Infrared spectroscopy (FTIR), X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). UV-Vis spectra revealed the enhancement in absorption properties of PANI/PVA/NiOx with optimum 5% incorporation of NiOx. TGA results indicated slightly enhanced thermal stability of the PANI/PVA/NiOx composite film as compared to PANI/PVA. FTIR spectra for composites revealed the existence of NiOx in polymers. However the crystallinity of PANI/PVA was not much affected. The antibacterial activity of the prepared composites was examined against four different gram negative bacteria, Salmonella, Shigella, Pseudomonas and Escherichia coli (E. coli). The composite exhibited excellent antibacterial activity against E. coli, Salmonella and Shigella while pseudomonas showed some resistance. Based on the results, PANI/PVA/ NiOx (5%) composite showed the highest activity against the tested bacterial strains, thus showing its potential to be used as an effective antibacterial agent.

scholarly journals Morphological, Optical, and Electrical Properties of p-Type Nickel Oxide Thin Films by Nonvacuum Deposition

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 636 ◽  
Author(s):  
Chien-Chen Diao ◽  
Chun-Yuan Huang ◽  
Cheng-Fu Yang ◽  
Chia-Ching Wu
Keyword(s):  
Thin Films ◽  
Electrical Properties ◽  
Nickel Oxide ◽  
Indium Tin Oxide ◽  
Heterojunction Diode ◽  
X Ray Diffraction ◽  
Photoelectric Device ◽  
Evaporation Ratio ◽  
Device Applications ◽  
P Type

In this study, a p-type 2 at% lithium-doped nickel oxide (abbreviation L2NiO) solution was prepared using Ni(NO3)2·6H2O, and LiNO3·L2NiO thin films were deposited using an atomizer by spraying the L2NiO solution onto a glass substrate. The sprayed specimen was heated at a low temperature (140 °C) and annealed at different high temperatures and times. This method can reduce the evaporation ratio of the L2NiO solution, affording high-order nucleating points on the substrate. The L2NiO thin films were characterized by X-ray diffraction, scanning electron microscopy, UV–visible spectroscopy, and electrical properties. The figure of merit (FOM) for L2NiO thin films was calculated by Haacke’s formula, and the maximum value was found to be 5.3 × 10−6 Ω−1. FOM results revealed that the L2NiO thin films annealed at 600 °C for 3 h exhibited satisfactory optical and electrical characteristics for photoelectric device applications. Finally, a transparent heterojunction diode was successfully prepared using the L2NiO/indium tin oxide (ITO) structure. The current–voltage characteristics revealed that the transparent heterojunction diode exhibited rectifying properties, with a turn-on voltage of 1.04 V, a leakage current of 1.09 × 10−4 A/cm2 (at 1.1 V), and an ideality factor of n = 0.46.

Sign in / Sign up

Export Citation Format

Share Document