Preparation and photoluminescence behavior of Mn-doped nano-ZnO

Wu, Benze; Li, Jin; Li, Qiang

doi:10.1016/j.ijleo.2019.05.037

Cited by 20 publications

(6 citation statements)

References 27 publications

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“…Wu et al have observed similar results, i.e., a blue shift in the absorption edge of ZnO and a broadening of E g , which indicates that Mn-doping not only produces elemental energy levels but also affects the intrinsic defect energy levels of ZnO [59]. Husain et al suggest that the blue shift in optical absorption or increase in the E g , by successive doping of Mn in ZnO, may be attributed to the orbitals hybridized between the Mn atom and host band [60].…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic Degradation of Methyl Green Dye Mediated by Pure and Mn-Doped Zinc Oxide Nanoparticles under Solar Light Irradiation

Akram

Fatima

Almohaimeed

et al. 2023

Adsorption Science & Technology

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Herein this study, pure and manganese- (Mn-) doped ZnO (2 wt. %) nanoparticles have been synthesized using the chemical precipitation method and characterized for the photodegradation of methyl green (MG) pollutant dye under natural sunlight. The structural analysis via XRD patterns has revealed that both intrinsic and Mn-doped ZnO (2 wt. %) samples have hexagonal wurtzite structures with appropriate phase purity, clearly indicating the absence of any external impurity. The incorporation of Mn in the host ZnO lattice has decreased the crystallite size (21.10 → 18.76 nm), and nanoparticle-type surface features with sizes in the 50–100 nm range have been observed through FESEM-based surface morphological studies. Both aforementioned observations have merit in providing more active area and a high surface area to volume ratio for photocatalytic reaction. The investigation of photophysical properties indicates that in Mn-doped ZnO nanoparticles, the absorption peak is blue-shifted by 5 nm (365 → 360 nm), due to the widening of the bandgap. The degradation kinetics of MG dye follow the pseudo-second-order kinetics, and the degradation efficiency has been observed to be 62.78% mediated by pure ZnO and 66.44% by Mn-doped ZnO (2 wt. %) photocatalyst under 60 minutes of sunlight irradiation. Specifically, the rate of photocatalytic reaction (K) ~0.01792 min-1 and R 2 ~0.97992 has been achieved for pure ZnO, whereas slightly higher (K) ~0.02072 min-1 and R 2 ~0.97299 have been observed for Mn-doped ZnO, respectively. Conclusively, the synergistic interactions with multiple charge transfer pathways, improvement of e−/h+ pair charge separation, improved surface area, and efficient generation of hydroxyl radicals are supposed to be responsible for the highly efficient photocatalytic activity of the Mn–doped ZnO photocatalyst for MG dye.

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Section: Resultsmentioning

confidence: 99%

Photocatalytic Degradation of Methyl Green Dye Mediated by Pure and Mn-Doped Zinc Oxide Nanoparticles under Solar Light Irradiation

Akram

Fatima

Almohaimeed

et al. 2023

Adsorption Science & Technology

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“…Figure 3 b shows the PL spectra of ZnO NRs. It can be found that the ZnO NRs decorated with and without Al NPs have a strong PL violet emission peak near 384 nm, which is mainly associated with the recombination luminescence of free excitons, and the blue emission peak at 449 nm is caused by the zinc vacancy defects [ 26 , 27 ]. The blue-green emission peaks at 467 nm, 480 nm and 491 nm are related to oxygen vacancy, oxygen antisite defects, and so on [ 28 , 29 ].…”

Section: Resultsmentioning

confidence: 99%

Fabrication and Performance of UV Photodetector of ZnO Nanorods Decorated with Al Nanoparticles

Shang¹,

Dong²,

Zhang³

et al. 2022

Nanomaterials

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In this work, localized surface plasmon resonance (LSPR) mediated by aluminum nanoparticles (Al NPs) was investigated to enhance the ultraviolet (UV) response of the zinc oxide nanorods (ZnO NRs) grown by the hydrothermal method. The ZnO NRs were characterized by scanning electron microscope, energy dispersive spectroscopy, X-ray diffractometer, Raman spectrometer, ultraviolet-visible spectrophotometer and fluorescence spectrometer. The results show that the morphology and crystalline structure of the ZnO NRs could not be changed before and after decoration with Al NPs, but the absorption rates in the UV range and the photoluminescence (PL) properties were improved. The photo-to-dark current ratio of ZnO NRs with Al NPs was about 447 for 325 nm UV light (5 mW/cm2) at 3.0 V bias, with the sensitivity increasing from 9.5 to 47.8, and the responsivity increasing from 53 to 267 mA/W.

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“…have been used to grow Mn‐doped ZnO (ZnMnO). [ 4,12–16 ] However, the inter‐relations of Mn‐related defects with luminescence and absorption characteristics of ZnMnO are not consistent in the existing literature. ZnO either forms an asymmetric wurtzite crystal structure or takes cubic form (especially at high pressures or as per the structure of an underlying substrate material for epitaxial thin films).…”

Section: Introductionmentioning

confidence: 94%

“…[ 13 ] In ZnMnO grown using a coprecipitation method, broad UV and green‐yellow luminescence were observed wherein the latter changed inconsistently with Mn‐doping. [ 14 ] ZnMnO synthesized by a spontaneous crystallization technique exhibited an increase in both the UV and green emission with Mn‐doping. [ 15 ] On the other hand, ZnMnO by a hydrothermal method showed a reduction in the broad yellow‐green‐red luminescence with Mn‐doping.…”

Section: Introductionmentioning

confidence: 99%

Optical and Structural Properties of Manganese‐Doped Zinc Oxide Grown by Metal‐Organic Chemical Vapor Deposition

Saravade

Manzoor

Corda

et al. 2021

Advanced Optical Materials

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This systematic study investigates the optical properties and process−structure−property relationships of Mn‐doped zinc oxide (ZnMnO) grown by metal‐organic chemical vapor deposition with varying Mn‐doping concentration and growth conditions. ZnMnO exhibits a good crystal quality oriented in the (002) direction and contains intermixtures of zinc oxide (ZnO)‐like and manganese oxide (MnxOy)‐like phases. The material exhibits a direct energy absorption band‐edge and a reduction in bandgap with Mn‐doping. Photoluminescence studies show that Mn‐doping can simultaneously tailor broad green band luminescence and ultraviolet edge emissions. Post‐growth air‐annealing results in broad MnxOy‐related photoluminescence emissions at 3.3–4.5 eV. A further reduction in the absorption band‐edge is also observed with annealing. Results indicate that luminescence wavelengths and intensities, and absorption band‐edge can be tuned with the Mn‐doping process. This paper promotes a thorough understanding of defect centers in ZnO with transition metal doping and their interrelation with optical characteristics. The work provides a solid foundation for the development of optoelectronic devices, such as light emitting diodes, solar cells, lasers, and photodetectors using ZnO‐based materials.

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Preparation and photoluminescence behavior of Mn-doped nano-ZnO

Cited by 20 publications

References 27 publications

Photocatalytic Degradation of Methyl Green Dye Mediated by Pure and Mn-Doped Zinc Oxide Nanoparticles under Solar Light Irradiation

Photocatalytic Degradation of Methyl Green Dye Mediated by Pure and Mn-Doped Zinc Oxide Nanoparticles under Solar Light Irradiation

Fabrication and Performance of UV Photodetector of ZnO Nanorods Decorated with Al Nanoparticles

Optical and Structural Properties of Manganese‐Doped Zinc Oxide Grown by Metal‐Organic Chemical Vapor Deposition

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