Band gap engineering and enhanced photoluminescence of Mg doped ZnO nanoparticles synthesized by wet chemical route

Arshad, Mohd Khairuddin; Ansari, Mohd Meenhaz; Ahmed, Arham S.; Tripathi, P.; Ashraf, S. S. Z.; Naqvi, Andleeb Z.; Azam, Ameer

doi:10.1016/j.jlumin.2014.12.016

Cited by 122 publications

(29 citation statements)

References 48 publications

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“…Due to its high surface activity, crystalline nature, morphological features, and texture; ZnO nanoparticles are considered as the most favorable catalyst for the degradation of organic pollutants [17]. Recent literature reported that Mg-doped ZnO nanostructures can exhibit excellent properties for device application [18]. Investigation on doping Group II elements with ZnO showed that the dopants can alter the band gap energy ( E g ) with an increase in the UV-Visible luminescence intensity [19].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Mg Doping on ZnO Nanoparticles for Enhanced Photocatalytic Evaluation and Antibacterial Analysis

Raj

Sadaiyandi²,

Kennedy³

et al. 2018

Nanoscale Res Lett

239

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In this research, a facile co-precipitation method was used to synthesize pure and Mg-doped ZnO nanoparticles (NPs). The structure, morphology, chemical composition, and optical and antibacterial activity of the synthesized nanoparticles (NPs) were studied with respect to pure and Mg-doped ZnO concentrations (0–7.5 molar (M) %). X-ray diffraction pattern confirmed the presence of crystalline, hexagonal wurtzite phase of ZnO. Scanning electron microscope (SEM) images revealed that pure and Mg-doped ZnO NPs were in the nanoscale regime with hexagonal crystalline morphology around 30–110 nm. Optical characterization of the sample revealed that the band gap energy (Eg) decreased from 3.36 to 3.04 eV with an increase in Mg2+ doping concentration. Optical absorption spectrum of ZnO redshifted as the Mg concentration varied from 2.5 to 7.5 M. Photoluminescence (PL) spectra showed UV emission peak around 400 nm. Enhanced visible emission between 430 and 600 nm with Mg2+ doping indicated the defect density in ZnO by occupying Zn2+ vacancies with Mg2+ ions. Photocatalytic studies revealed that 7.5% Mg-doped ZnO NPs exhibited maximum degradation (78%) for Rhodamine B (RhB) dye under UV-Vis irradiation. Antibacterial studies were conducted using Gram-positive and Gram-negative bacteria. The results demonstrated that doping with Mg ions inside the ZnO matrix had enhanced the antibacterial activity against all types of bacteria and its performance was improved with successive increment in Mg ion concentration inside ZnO NPs.

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Section: Introductionmentioning

confidence: 99%

“…Metal ion-doped ZnO nanostructures are the most promising catalyst for the degradation of various pollutants because of its enhancement in its optical properties [21]. Different types of infectious diseases caused by bacteria pose a severe menace towards the public health worldwide.…”

Section: Introductionmentioning

confidence: 99%

Influence of Mg Doping on ZnO Nanoparticles for Enhanced Photocatalytic Evaluation and Antibacterial Analysis

Raj

Sadaiyandi²,

Kennedy³

et al. 2018

Nanoscale Res Lett

239

View full text Add to dashboard Cite

show abstract

“…The broad emission band located in the visible range (400-700 nm) is mainly due to point-like structural defects related to deep-level emissions, such as zinc vacancies, oxygen vacancies, interstitial zinc, and interstitial oxygen, with a shoulder yellow-orange emission. For important concentrations of doping (15 and 25 % Li), the emission of the deep levels dominates specters PL and their intensity increases, its high intensity is a characteristic required for optoelectronic applications [43]. The incorporation of Li 2+ is difficult due to the presence of native defects in ZnO lattice may cause the formation of different intrinsic defects which lead to the improved visible emission [44].…”

Section: Pl Analysismentioning

confidence: 99%

Li-doped ZnO Sol-Gel Thin Films: Correlation between Structural Morphological and Optical Properties

Hb¹,

Wr²,

Zaghouani³

et al. 2018

J Textile Sci Eng

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Transparent Conducting Oxides (TCOs) have important device applications used in solar cells as transparent electrodes. In particular, ZnO material has been investigated for many years due to its excellent physical properties and potential applications in transparent conductive contacts when it is doped by several types of doping. If n-type doping is easily achievable in ZnO, the realization of stable and reproducible p-type ZnO is still difficult. The group I (Li, Na) atoms could be potential candidates to result in p-type ZnO. The choice of lithium as a dopant is motivated firstly by its abundance in nature, its low cost compared to other alkali metals and its wide application. Undoped and Lithium-doped zinc oxide thin films (ZnO:Li) at different percentages (5, 15 and 25%) were prepared on glass substrates, using the sol-gel spin-coating method, and the influence of the Li concentration on the structural, morphological and optical properties of the ZnO thin films was investigated. X-ray diffraction (XRD) analysis shows that the un-doped and 5 at % Li-doped films have a hexagonal wurtzite structure and are preferentially oriented along the c-axis from the substrate. SEM analysis shows a compact surface with mainly hexagonal grains. Optical transmittance measurements show that all samples have average 88% transparency in the visible light, with a sharp fall of the absorption at a wavelength (~376 nm) close to the ZnO band gap. The results suggest that the optical properties of the ZnO:Li films can be further improved for solar cell applications.

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“…Mn, and Co) [17] or through coupling with other semiconductors or photosensitizer to form an efficient heterostructure material [13,14,16]. Magnesium (Mg) is a promising metal for doping ZnO and then can improve the photocatalytic activities of ZnO NPs under solar radiation and can be used for decomposition of organic dyes into less toxic compounds [18,19].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic properties for different metal-oxide nanomaterials

Adam

Mustafa

Elhag

et al. 2019

Oxide-Based Materials and Devices X

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We here demonstrate the synthesis of different nanostructures, including nanoparticles, nanorods, core-shell structures, and compound metal oxide nanostructures all synthesized by a low temperature chemical process. We further investigated their photocatalytic properties for degradation of toxic waste and their photochemical efficiency for water splitting. All the photocatalytic properties as well as the photochemical properties were utilized using sun radiation. The results presented indicate huge potential for the investigated processes with positive impact to energy consumption and benefits for the environment.

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Band gap engineering and enhanced photoluminescence of Mg doped ZnO nanoparticles synthesized by wet chemical route

Cited by 122 publications

References 48 publications

Influence of Mg Doping on ZnO Nanoparticles for Enhanced Photocatalytic Evaluation and Antibacterial Analysis

Influence of Mg Doping on ZnO Nanoparticles for Enhanced Photocatalytic Evaluation and Antibacterial Analysis

Li-doped ZnO Sol-Gel Thin Films: Correlation between Structural Morphological and Optical Properties

Photocatalytic properties for different metal-oxide nanomaterials

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