Mg-doped ZnO nanostructures for efficient Organic Light Emitting Diode

Manzhi, Payal; Kumari, Reema; Alam, Md Bayazeed; Umapathy, G.R.; Krishna, R. Hari; Ojha, Sunil; Srivastava, Ritu; Sinha, O. P.

doi:10.1016/j.vacuum.2018.10.070

Cited by 35 publications

(12 citation statements)

References 29 publications

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“…Zn 2+ substitute into Mg 2+ leads to the increment in electron concentration and oxygen vacancy because of ionic radii and electronegativity difference of both materials, and thus, increase of carrier density leads the way to lifting of Fermi level to the degenerate semiconductor CB as ZnO is one of the most degenerate semiconductors. Due to this action, Fermi level as well as its position relies upon concentration of free electrons and excitation of electrons from VB to Fermi level, resulting in the increment of density of free electron and band gap widening [ 39 ]. This Burstein–Moss shift contributes to the observed Eg widening of Mg-doped ZnO NRs.…”

Section: Resultsmentioning

confidence: 99%

“…All samples showed an emission peak in the UV region, which is ascribed to exciton recombination. Peaks observed in the visible region appear due to defect states (donor), such as O 2 vacancies-V o , Zn interstitials-Zn i , defect states (acceptor) from zinc vacancies-V z and oxygen interstitials-O i [ 39 ]. The peaks intensity ratio in the UV and visible region is mostly affected by crystal quality of doped materials, as the defects density decreases with crystallinity amplification.…”

Section: Resultsmentioning

confidence: 99%

“…The peaks intensity ratio in the UV and visible region is mostly affected by crystal quality of doped materials, as the defects density decreases with crystallinity amplification. Samples demonstrated emission peaks around 408 nm ascribing to near-band edge-NBE transition of ZnO [ 39 ]. The peaks found at 408, 442, 467, 488 nm lead to blue emission and attributable to Zn interstitials have a major violet emission at 408 nm.…”

Section: Resultsmentioning

confidence: 99%

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Doping of Mg on ZnO Nanorods Demonstrated Improved Photocatalytic Degradation and Antimicrobial Potential with Molecular Docking Analysis

et al. 2021

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Various concentrations of Mg-doped ZnO nanorods (NRs) were prepared using co-precipitation technique. The objective of this study was to improve the photocatalytic properties of ZnO. The effect of Mg doping on the structure, phase constitution, functional groups presence, optical properties, elemental composition, surface morphology and microstructure of ZnO was evaluated with XRD, FTIR, UV–Vis spectrophotometer, EDS, and HR-TEM, respectively. Optical absorption spectra obtained from the prepared samples showed evidence of blueshift upon doping. XRD results revealed hexagonal wurtzite phase of nanocomposite with a gradual decrease in crystallite size with Mg addition. PL spectroscopy showed trapping efficiency and migration of charge carriers with electron–hole recombination behavior, while HR-TEM estimated interlayer d-spacing. The presence of chemical bonding, vibration modes and functional groups at the interface of ZnO was revealed by FTIR and Raman spectra. In this study, photocatalytic, sonocatalytic and sonophotocatalytic performance of prepared NRs was systematically investigated by degrading a mixture of methylene blue and ciprofloxacin (MBCF). Experimental results suggested that improved degradation performance was shown by Mg-doped ZnO NRs. We believe that the product synthesized in this study will prove to be a beneficial and promising photocatalyst for wastewater treatment. Conclusively, Mg-doped ZnO exhibited substantial (p < 0.05) efficacy against gram-negative (G-ve) as compared to gram-positive (G+ve) bacteria. In silico molecular docking studies of Mg-doped ZnO NRs against DHFR (binding score: − 7.518 kcal/mol), DHPS (binding score: − 6.973 kcal/mol) and FabH (− 6.548 kcal/mol) of E. coli predicted inhibition of given enzymes as possible mechanism behind their bactericidal activity.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Doping of Mg on ZnO Nanorods Demonstrated Improved Photocatalytic Degradation and Antimicrobial Potential with Molecular Docking Analysis

et al. 2021

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“…The O 2 peak intensity of Mg-doped ZnO has a higher peak intensity than the undoped ZnO, and the O 2 peak area ratio changes from 14.19% t to 45.15% t, indicating that the dopant greatly increases the oxygen vacancy concentration. This result is an increase in oxygen vacancies due to the difference in electronegativity and ionic radius between Zn and Mg during the substitution of Zn 2+ by Mg 2+ in the ZnO lattice [36]. Some previous studies have shown that oxygen vacancies on the surface increase the concentration of the charge carriers and are therefore able to improve the humidity sensing performance [37].…”

Section: Resultsmentioning

confidence: 99%

Enhancement of the Humidity Sensing Performance in Mg-Doped Hexagonal ZnO Microspheres at Room Temperature

Lin

Zhang

et al. 2019

Sensors

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In this paper, Mg-doped black ZnO microspheres with the characteristics of large surface area and surface oxygen vacancies were synthesized using the sol-gel method. The humidity sensing behavior of the Mg-doped ZnO for relative humidity (RH) from 11% to 95% was measured at room temperature. The superior humidity sensing performance recorded for Mg-doped ZnO microspheres (1.5 mol%) exhibits a dramatic change of impedance of about four orders of magnitude, excellent sensing linearity, small hysteresis (4.1%), a fast sensing response time of as low as 24 s, and a recovery time of 12 s. Our studies demonstrate that Mg dopant can significantly enhance the humidity sensing performance of black ZnO. This benefits from the Mg-doped ZnO (1.5 mol%) microspheres having a high level of surface adsorption and the abundant oxygen vacancies on the surface. Such a new material could be very useful to develop simple and high-performance humidity sensors for future applications in varying commercial fields and industries.

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“…ZnO has attracted the attention of many researchers for many years due to some of its properties such as wide band gap (3.30eV), high exciton binding energy (60MeV) at room temperature, stable hexagonal wurtzite structure with space group P63mc [1,2]. These features have made it desirable for several applications including photocatalysis [3], surface acoustic wave devices [4], photodetectors [5], gas sensors [6], light-emitting diodes [7,8], and solar cells [9]. ZnO lms has been produced using various methods such as thermal evaporation [10], pulsed laser [11], sol-gel spin-coated [12,13], spray pyrolysis [14], rf sputtering [15,16], electro deposition [17], dc-rf magnetron sputtering [18,19], metal-organic chemical vapor deposition [20], and so on.…”

Section: Introductionmentioning

confidence: 99%

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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Mg-doped ZnO nanostructures for efficient Organic Light Emitting Diode

Cited by 35 publications

References 29 publications

Doping of Mg on ZnO Nanorods Demonstrated Improved Photocatalytic Degradation and Antimicrobial Potential with Molecular Docking Analysis

Doping of Mg on ZnO Nanorods Demonstrated Improved Photocatalytic Degradation and Antimicrobial Potential with Molecular Docking Analysis

Enhancement of the Humidity Sensing Performance in Mg-Doped Hexagonal ZnO Microspheres at Room Temperature

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

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