Enhanced photocatalytic activity of Mg-doped ZnO thin films prepared by sol–gel method

Islam, Muhammad R.; Azam, Muhammad G.

doi:10.1080/02670844.2020.1801143

Cited by 38 publications

(21 citation statements)

References 42 publications

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“…The increase of Urbach energy also suggests that the incorporation of GO introduces localized states within the forbidden energy bandgap [48]. The presence of such localized states may also act as trap center for charge carriers and can favor the photocatalytic degradation process [48,49].…”

Section: Optical Propertiesmentioning

confidence: 97%

GO based PVA nanocomposites: tailoring of optical and structural properties of PVA with low percentage of GO nanofillers

Hurayra–Lizu

Bari

Gulshan

et al. 2021

Heliyon

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Graphene-based polymer composites are gaining interest as a modish class of substance that holds promising angles on diverse applications. In this work, Graphene Oxide (GO) based Polyvinyl Alcohol (PVA) nanocomposites (PVA-GO) have been prepared by employing a facile solution casting method. Low concentrations of GO nanofiller (0.25%, 0.50%, 0.75%, and 1.0%) were used and the result of the use of them over the distinct substantial characteristics of the nanocomposites was evaluated. The different features of the as-synthesized nanocomposites such as optical, structural, chemical, and thermal properties were identified by UV-Vis spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR), and Thermo-gravimetric analysis (TGA), respectively. From the structural analysis of the crystallinity of the nanocomposite it is evident that a reduction in crystallinity caused by the amalgamation of the GO nanofiller. FTIR study shows improved interaction between the GO nanofiller and PVA matrix. The incorporation of GO was found to reduce the optical band gap of the nanocomposite both for the direct and indirect transition. The Urbach energy of the nanocomposite increases with the increase of the GO concentration suggests the formation of localized states causing a reduction in the optical band gap. PVA-GO nanocomposites with improved and tunable physical properties synthesized from a simple and economic route may pave a new horizon for polymer-based optoelectronic devices.

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Section: Optical Propertiesmentioning

confidence: 97%

GO based PVA nanocomposites: tailoring of optical and structural properties of PVA with low percentage of GO nanofillers

Hurayra–Lizu

Bari

Gulshan

et al. 2021

Heliyon

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“…The increase in band-gap can be linked to the fact that new defects are inserted after Mg 2+ substitute for Zn 2+ , owing to the electronegativity and ionic radius differences between Mg and Zn, there are more electrons shared by Mg dopant related to the lower electron affinity of MgO compared to ZnO. This causes a shift of the Fermi level inside the conduction band in the case of Mg-doped ZnO, or because of the wide band-gap of MgO comparing to ZnO [6,16]. These results make our deposited films candidates for use in optoelectronics, photovoltaics and multiple optical applications although this is not the focus of the present study.…”

Section: %) Filmsmentioning

confidence: 99%

“…So far, a number of metal atoms, including, Al, Co, Mn, Ag, Fe, Mg, etc. [16] in the form of dopants were introduced into the ZnO crystal lattice to substitute Zn. An improvement in the doping technology of ZnO by Mg [17] has promoted many new applications in electronics and ultraviolet optoelectronic devices.…”

Section: Introductionmentioning

confidence: 99%

Influence of magnesium doping on microstructure, optical and photocatalytic activity of zinc oxide thin films synthesis by sol–gel route

et al. 2021

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The article deals with the effect of Mg dopant on the properties and the photocatalytic of ZnO films synthesized by the sol-gel technique onto glass substrates. It is found that Mg dopant has a strong influence on the microstructure and functional properties.The EDX analysis revealed that Mg had been incorporated into the ZnO. Structural studies through XRD have shown that the deposited films are of hexagonal structure with a preferential growth along the c-axis and nanometer crystal size. According to AFM analysis; it is found that the roughness of Mg-doped ZnO films increases with the Mg dopant. The film surface depicted wrinkles morphology as observed by ESEM. Optical investigations by spectrophotometry and photoluminescence revealed that as the Mg dopant is increased, the optical band-gap increases. Moreover, near band edge and visible emissions as probed by Photoluminescence can be manipulated by the Mg dopant, as their intensity increases and decreases, respectively. Finally, the photocatalytic activity for degradation of methylene blue is strongly improved all the more as the Mg content is increased.

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“…It is known that optical properties of semiconductor thin films depend on the deposition method [9,10]. Currently, various methods are used to obtain ZnO thin films: radio frequency (RF) or direct current sputtering, spray pyrolysis, spin coating, metal organic chemical vapor deposition and pulsed laser deposition [5][6][7][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…Doping of zinc oxide thin films results in different changes of physical properties. In most cases, doping of thin films results in an increase in the band gap value [11][12][13][15][16][17][18][19][20][21][22] caused by the influence of the Burstein-Moss effect [20][21][22] and increased contribution of defects [21] (Zn, O vacancies). In several studies [23][24][25][26], doping with different chemical elements leads to a decrease in the band gap, or the value of the band gap remains almost independent of doping.…”

Section: Introductionmentioning

confidence: 99%

Optical and Dispersion Parameters of the Al-doped ZnO Thin Film

Kashuba¹,

Andriyevsky²,

Ільчук³

et al. 2021

J. Nano- Electron. Phys.

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The results of studies of the dispersion of optical functions and optical constants for zinc oxide thin film doped with aluminum are presented. The deposition of Al-doped ZnO (2.5 wt. %) thin films is performed by magnetron sputtering. Al-doped ZnO thin film crystallizes in a hexagonal structure (structure type ZnO, space group P63mc (No. 186) with unit-cell dimensions a  3.226(2) Å and c  5.155(6) Å (V 46.49(6) Å 3 ). Optical transmittance spectra (300-2500 nm) shows that the Al-doped ZnO thin film is of high optical quality, and the value of the optical band gap (3.26 eV) is very close to undoped samples. The study of optical functions is performed on the basis of the experimentally measured transmission spectrum using the bypass method. The spectral behavior of optical functions, such as refractive index, extinction coefficient, absorption index, dielectric functions and optical conductivity, is established. The value of Urbach energy and the dependence of oscillator strength on the size of the band gap and the concentration of doping element are determined. It is observed an increase in Urbach energy for the Al-doped ZnO thin film in comparison to the undoped ones. An almost twofold increase in the optical oscillator strength value is revealed for the thin film studied. The influence of aluminum doping on the dynamic change of optical mobility, optical resistance and relaxation time is established for the first time for the studied compound. The value of the plasma frequency is also determined and its correlation with the carrier density is defined. The doping of ZnO thin films with aluminum leads to an increase in optical mobility, relaxation time and plasma frequency that is revealed by comparison with reference data for the undoped ZnO. Due to good optical properties, this thin film is a good candidate as a material for optoelectronic devices.

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Enhanced photocatalytic activity of Mg-doped ZnO thin films prepared by sol–gel method

Cited by 38 publications

References 42 publications

GO based PVA nanocomposites: tailoring of optical and structural properties of PVA with low percentage of GO nanofillers

GO based PVA nanocomposites: tailoring of optical and structural properties of PVA with low percentage of GO nanofillers

Influence of magnesium doping on microstructure, optical and photocatalytic activity of zinc oxide thin films synthesis by sol–gel route

Optical and Dispersion Parameters of the Al-doped ZnO Thin Film

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