Showing papers by "Omer Nur published in 2020"
TL;DR: In this article, zinc oxide (ZnO) nanorods are doped with copper by low temperature aqueous chemical growth method using different concentrations of copper 5, 10, 15, 20, and 24 respectively.
54 citations
TL;DR: In this article, Magnesium (Mg)-doped zinc oxide (ZnO) nanoparticles (NPs) have shown great interest as a potential for green and efficient photocatalysis activities.
41 citations
TL;DR: The structural and electrical properties of CoFe2O4/MWCNTs make it of potential for capacitive storage and optoelectronic devices as discussed by the authors, which can be utilized for developing recyclable photocatalytic applications.
Abstract: NiFe2O4, NiFe2O4/MWCNTs, CoFe2O4 and CoFe2O4/MWCNTs nanocomposites were synthesized via the hydrothermal method. XRD, FT-IR, SEM and TEM techniques have been used to investigate the structural properties. CoFe2O4/MWCNTs has a good morphology with small sizes compared to NiFe2O4/MWCNTs. UV–vis. DRS analysis showed that the nanocomposites have high absorbance of irradiation in the whole range of the wavelengths (200–900 nm). The optical energy gaps of the nanocomposites have been calculated. Using VSM technique, NiFe2O4 and NiFe2O4/MWCNTs exhibited super-paramagnetism at room temperature, while CoFe2O4 and CoFe2O4/MWCNTs exhibited ferromagnetism with saturation magnetization of 37.8, 25.5, 66.46 and 51.49 emu/g, respectively. The AC conductivity measurements for NiFe2O4 and CoFe2O4 NPs revealed an increase in conductivity with the addition of MWCNTs as well as the dielectric measurements. The structural and electrical properties of CoFe2O4/MWCNTs make it of potential for capacitive storage and optoelectronic devices. Promising magnetic-optical properties can be utilized for developing recyclable photocatalytic applications.
40 citations
TL;DR: In this article, a novel multifunctional NiFe2O4/MWCNTs/ZnO hybrid nanocomposite has been successfully synthesized via the hydrothermal and the co-precipitation methods at 210 and 90 degrees C, respectively, to be used as a solar radiation driven photocatalytic material.
33 citations
TL;DR: This review covers the importance of E. coli O157:H7 and recent progress (from 2015 to 2020) in the development of the sensitivity and selectivity of electrochemical sensors developed for E. bacteria using different nanomaterials, labels, and electrochemical transducers.
28 citations
TL;DR: In this article, the electrical characterization of p-Silicon (Si) and n-Zinc oxide (ZnO) nanorod heterojunction diode has been performed.
Abstract: The electrical characterization of p-Silicon (Si) and n-Zinc oxide (ZnO) nanorod heterojunction diode has been performed. ZnO nanorods were grown on p-Silicon substrate by the aqueous chemical growth (ACG) method. The SEM image revealed high density, vertically aligned hexagonal ZnO nanorods with an average height of about 1.2 μm. Electrical characterization of n-ZnO nanorods/p-Si heterojunction diode was done by current-voltage (I-V), capacitance-voltage (C-V), and conductance-voltage (G-V) measurements at room temperature. The heterojunction exhibited good electrical characteristics with diode-like rectifying behaviour with an ideality factor of 2.7, rectification factor of 52, and barrier height of 0.7 V. Energy band (EB) structure has been studied to investigate the factors responsible for small rectification factor. In order to investigate nonidealities, series resistance and distribution of interface state density (NSS) below the conduction band (CB) were extracted with the help of I-V and C-V and G-V measurements. The series resistances were found to be 0.70, 0.73, and 0.75 KΩ, and density distribution interface states from 8.38 × 1012 to 5.83 × 1011 eV−1 cm−2 were obtained from 0.01 eV to 0.55 eV below the conduction band.
22 citations
TL;DR: Biodiesel is a sustainable alternative to petroleum diesel produced by transesterification of vegetable oils in the presence of a catalyst and heterogeneous transesterif...
Abstract: Biodiesel is a sustainable alternative to petroleum diesel produced by transesterification of vegetable oils in the presence of a catalyst. The present study investigates heterogeneous transesterif...
18 citations
TL;DR: In this paper, the possibility of introducing zinc oxide nanoparticles into the cement raw mix so as to reduce the energy consumption and CO2 emissions during processing was investigated, and the results showed that the nanoparticles can reduce the CO2 emission.
Abstract: The present study investigates the possibility of introducing zinc oxide nanoparticles into the cement raw mix so as to reduce the energy consumption and CO2 emissions during processing. Zi...
7 citations
TL;DR: The effects of white-light irradiation on ~15 nm diameter ZnO nanoparticles are investigated by means of electron paramagnetic resonance, near liquid-nitrogen and liquid-helium temperatures, and a four-lines structure appears, with the same gravity center as that of the surface defects.
Abstract: The effects of white-light irradiation on ∼ 20 nm diameter ZnO nanoparticles are investigated by means of electron paramagnetic resonance, near liquid-nitrogen and liquid-helium temperatures. Under dark conditions, usual core-and surface-defects are detected, respectively at g = 1.960 and g = 2.003. Under white-light illumination, the core-defect signal intensity is strongly increased, which is to be correlated to the light-induced conductivity's augmentation. Beside, a four-lines structure appears, with the same gravity center as that of the surface defects. Simulations and intensity power-dependence measurements show that this four-line-structure is very likely to arise from a localized high spin S = 2, induced by light irradiation, and subjected to a weak axial anisotropy. At 85 K, this high-spin state can last several hours after the light-irradiation removal, probably due to highly spin-forbidden recombination process. The possible excited resonant complexes at the origin of this signal are discussed. Other light-induced S = 1/2-like centers are detected as well, which depends on the nanoparticles growth conditions.
6 citations
01 Jan 2020
TL;DR: This chapter discusses the emerging new low-temperature chemical-based nanofabrication synthesis methods and the basic principle of each method is to be introduced.
Abstract: In this chapter the emerging new low-temperature chemical-based nanofabrication synthesis methods are highlighted and discussed. The discussion will be focused on the most established low-temperature synthesis methods. The basic principle of each method is to be introduced. Examples of successful experiments are presented and discussed.
5 citations
01 Jan 2020
TL;DR: Newly developed bottom-up low-temperature methods are introduced as efficient approaches that have potential for developing high-quality nanostructures suitable for many functional devices.
Abstract: s In this chapter newly developed bottom-up low-temperature methods are introduced as efficient approaches that have potential for developing high-quality nanostructures suitable for many functional devices. Here both top-down and bottom-up strategies performed at both high and low processing temperatures are introduced.
01 Jan 2020
TL;DR: In this article, the consequences of reduction in size are reviewed, including size-related effects, like the modification of the band structure, bandgap modification, surface effects, and nanolinearity effects.
Abstract: s Here the consequences of reduction in size are reviewed. This includes size-related effects, like the modification of the band structure, that is, bandgap modification, surface effects, and nanolinearity effects. In addition different important physical and chemical properties modification of restructuring compared to the bulk count partner is to be reviewed and analyzed. The technological potential for new devices like self-powered technology are introduced (discussed in more detail in Chapter 6: Emerging new applications and future prospects and challenges).