Propose for Raman mode position for Mn-doped ZnO nanoparticles

Zolfaghari, Mahmoud

doi:10.1016/j.physb.2018.11.072

Cited by 25 publications

(8 citation statements)

References 32 publications

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“…The Raman spectra of the samples, shown in Figure 3, reveal information about the short‐range structure of the thin film materials and it is in agreement with the XRD data as there is only one significant peak at 511 cm −1 which belongs to wurtzite hexagonal structure of ZnO [29] . Hence, The Raman spectra also confirms that there is no secondary or impurity phase developed on doping ZnO with Mn.…”

Section: Resultssupporting

confidence: 75%

Sputter Deposited Mn‐doped ZnO Thin Film for Resistive Memory Applications

et al. 2022

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Transition metal doped Zinc oxide (ZnO) thin films with wide band gap semiconducting nature have diverse range of applications including, gas sensors, optical and optoelectronic devices, electronics and spintronics spintronic devices etc. In the present study, Manganese (Mn)‐doped ZnO thin films deposited on glass substrates using RF‐magnetron sputtering have been investigated for their optical and electrical behavior aiming at resistive random access memory applications. To study the influence of Mn doping and correlation between the structural and the physical properties of the films, the samples were characterized by X‐ray Diffraction (XRD), Raman spectroscopy, Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive X‐ray Spectroscopy (EDS), UV‐VIS spectrophotometry and X‐ray photoelectron spectroscopy (XPS). The films are found to be crystalline and a decrease in lattice parameter from 2.6049 Å to 2.5845 Å, an increase in optical band gap from 3.27 eV to 3.35 eV and a decrease in Urbach energy from 0.222 eV to 0.171 eV, is observed with increase in Mn‐concentration. The electrical performance of the film with highest Mn‐content is found to be more suitable for resistive memory applications. Tailoring the electrical behavior of the film by incorporating Mn as dopant is an important approach to find suitable material combination for novel memory devices.

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Section: Resultssupporting

confidence: 75%

Sputter Deposited Mn‐doped ZnO Thin Film for Resistive Memory Applications

et al. 2022

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“…The removal efficiency of COD at different gas flows can be seen in Figures (13)(14)(15)(16). These figures show that the best removal effectiveness was 93% when pH = 5 after 90 min, and 90% when pH= 3 after 120 min.…”

Section: Effect Of Phmentioning

confidence: 91%

“…(12) (13) Operating with pH < PZC (TiO2) (pH = 3, 5, and 7) the catalyst's surface charge becomes positively charged, exerting an electrostatic attraction force between TiO2 and the anionic charged of organic molecules and this enhances the adsorption onto the photon-activated TiO2 surface, facilitating subsequent photocatalytic processes [36]. Whilst in the basic solutions (pH > PZC (TiO2) (pH = 9 and 11)), the catalyst's surface charge becomes negative, causing repulsion between the TiO2 and anionic molecules and this will reduce the degradation process.…”

Section: Effect Of Phmentioning

confidence: 99%

“…TiO2 and ZnO are the most material that has such properties, they were extensively investigated and exploited in heterogeneous photocatalysis [11,12]. TiO2 converts organic contaminants into CO2, H2O, and reactive oxidizing species such as oxygen or air during the photocatalytic process [13]. Figure (2a) depicts the number of papers on various semiconductors in the field of photocatalysis demonstrating the dominance of these two semiconductor oxides in this field of research.…”

Section: Introductionmentioning

confidence: 99%

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The Combined Effect of Bubble and Photo Catalysis Technology in BTEX Removal from Produced Water

Al-Nuaim

Alwasiti

Shnain

et al. 2022

Bull. Chem. React. Eng. Catal.

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Among the several ways used in wastewater treatment, the photocatalysis process is a more novel and alternative process that is increasingly employed in recent years. This work aims to improve the performance of the photocatalyst process by using air bubbles in removing the BTEX from produced water as an indicator of process efficiency. The study also shows the effect of influencing factors (pH and residence time) on the photocatalysis process. The study was done in a rectangular column with dimensions of 200 mm width, 30 mm depth, and 1500 mm height. Commercial titanium oxide (TiO2) coated on a plate by the varnish was used as a source of the photocatalyst. The experiment was carried out under different values of gas flow rate (0-3 L/min) to evaluate its effect on the photocatalyst process, the effect of other variables of pH (3-11), and irradiation time (30-120) min was also studied. A new method of the coating was adopted by using an alumina plate with varnish as an adhesive. The characteristics results show that the coated plate has hydrophilic properties and that there is no significant change in the crystal structure of the TiO2 nanoparticles and the varnish before and after 60 h of the photocatalytic process, indicating that the plate is still effective after 60 h usage under different conditions. The results also show that the introduction of air bubbles enhances the removal efficiency of BTEX significantly and the best removal effectiveness of BTEX was 93% when pH = 5 after 90 min and 90% when pH = 3 after 120 min. The removal rate also reached 86% when pH = 7 after 120 min all at a flow rate of 3 L/min. The percentage of removal decreased at pH = 9 and 11, reaching 64% and 50%, respectively after 120 min and a flow rate of 3 L/min. Copyright © 2022 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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“…Consequently, a long-range electrostatic eld formed by the polarization of A1 in a unit cell splits the polar mode into transverse optical (TO) and longitudinal optical (LO) components. [43,49]. A 1 (LO) modes can be observed for highly oriented ZnO lms [43,46,50].…”

Section: Raman Analysismentioning

confidence: 97%

Highly c-axis Oriented ZnO Thin Films by Sol-gel Method

Kutlu¹,

Erdogan²,

Sedefoğlu³

et al. 2021

Preprint

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This study reports the effect of annealing temperature on the structural, morphological, and optical properties of ZnO (Zinc Oxide) thin films deposited on a glass substrate by the sol-gel spin coating method. Those properties of ZnO were examined with UV-Vis, Fourier transform infrared (FTIR) and Raman spectroscopy, Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), and X-ray diffraction (XRD), before and after annealing. XRD results revealed that all the samples had a highly c-axis oriented wurtzite structure. A 1 (LO) mode in Raman spectra also confirmed the highly oriented ZnO films. Optical measurement indicated that transmittance of the films was above %85, and the optical band gap slightly decreased with the increasing annealing temperature from 350 to 550 °C. Morphological analysis displayed that increasing annealing temperature improved surface morphology and enlarged the grain size from 2-3 nm for as-deposited samples to 150 nm for annealed at 550 °C.

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Propose for Raman mode position for Mn-doped ZnO nanoparticles

Cited by 25 publications

References 32 publications

Sputter Deposited Mn‐doped ZnO Thin Film for Resistive Memory Applications

Sputter Deposited Mn‐doped ZnO Thin Film for Resistive Memory Applications

The Combined Effect of Bubble and Photo Catalysis Technology in BTEX Removal from Produced Water

Highly c-axis Oriented ZnO Thin Films by Sol-gel Method

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