Structural, diffused reflectance and photoluminescence study of cerium doped ZnO nanoparticles synthesized through simple sol–gel method

Pandey, Padmini; Kurchania, Rajnish; Haque, Fozia Z.

doi:10.1016/j.ijleo.2015.06.026

Cited by 40 publications

(13 citation statements)

References 60 publications

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“…Higher concentrations of Ce could produce the accumulation of Ce atoms in or near the boundary of ZnO NPs, resulting in a decreased diffusion rate, which prevents the growth of NPs, so that the CS decreases gradually. This phenomenon has also been observed in other studies [17,18]. Based on XRD data, the lattice parameters have been calculated from 1/d(hkl) 2 = [(h 2 + k 2 + hk)/a 2 ] + l 2 /c 2 , where dhkl is the inter-planar distance, (hkl) are the Miller indexes and 'a' and 'c' are lattice constants.…”

Section: Resultssupporting

confidence: 71%

“…Such prospects have led to extensive studies of many aspects of Ce-doped ZnO (CZO), motivated by the interest in generating new and unique technologies for manufacturing high-quality doped nanomaterials to obtain enhanced catalysts. Due to the attractive properties and potential applications of CZO nanoparticles (NPs), a variety of preparation techniques have been reported, notable examples include, the electrospinning method [12], sonochemical synthesis [13], microwave-assisted synthesis [14], the combustion method [15], the vapor-solid method [16], the sol-gel method [17][18][19], the magnetron sputtering method [20], and many others [21][22][23][24]. However, most of the reported methods are time-consuming, require complicated equipment with expensive chemical precursors, and operate only under particular and controlled reaction conditions such as pH, growth time, concentration, atmosphere, etc.…”

Section: Introductionmentioning

confidence: 99%

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ZnO Nanoparticles with Controllable Ce Content for Efficient Photocatalytic Degradation of MB Synthesized by the Polyol Method

et al. 2021

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This paper reports on the synthesis of Ce-doped ZnO (CZO) nanoparticles (NPs) by an alternative polyol method at low temperature. The method, facile and rapid, uses acetate-based precursors, ethylene glycol as solvent, and polyvinylpyrrolidone as capping agent. The effects of the Ce-doping concentration (ranging from 0 to 8.24 atomic%) on the structural, morphological, compositional, optical, luminescence, and photocatalytic properties of the NPs were investigated by several techniques. The structural findings confirmed that the CZO NPs have a typical hexagonal wurtzite-type structure with a preferred orientation along the (101) plane. The results obtained by Field Emission Scanning Electron Microscopy (FESEM) and Transmission Electron Microscopy (TEM) revealed that the NPs size decreased (from ~30 to ~16 nm) with an increase in the Ce-doping concentration. Energy Dispersive X-Ray Spectroscopy (EDS) and High Resolution Transmission Microscopy (HRTEM) results confirmed the incorporation of Ce ions into the ZnO lattice. Ce-doping influences the photoluminescence (PL) emission compared to that of pure ZnO. The PL emission is related to the presence of different kinds of defects, which could take part in charge transfer and/or trapping mechanisms, hence playing an essential role in the photocatalytic activity (PCA). In fact, in this work we report an enhancement of PCA as a consequence of Ce-doping. In this sense, the best results were obtained for samples doped with 3.24 atomic%, that exhibited a photocatalytic degradation efficiency close to 99% after 60 min ultraviolet (UV) illumination, thus confirming the viability of Ce-doping for environmental applications.

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Section: Resultssupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

ZnO Nanoparticles with Controllable Ce Content for Efficient Photocatalytic Degradation of MB Synthesized by the Polyol Method

et al. 2021

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“…This green emission band is due to the formation of oxygen vacancies by the presence of MoO 3 oxide in the structure of the target nanostructures and the presence of some intrinsic defects in the ZnO structure. Generally, the intrinsic defects in ZnO include oxygen vacancies (V o ), zinc vacancies (V Zn ) oxygen (O i ), zinc (Zn i ) interstitials, and defect states dominating the emission in the visible range [ 24 ]. It was observed from Figure 7 that the emission intensity is considerably enhanced with the addition of MoO 3 as compared to the free ZnO sample.…”

Section: Resultsmentioning

confidence: 99%

New Electrospun ZnO:MoO3 Nanostructures: Preparation, Characterization and Photocatalytic Performance

Pascariu¹,

Homocianu²,

Olaru³

et al. 2020

Nanomaterials

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New molybdenum trioxide-incorporated ZnO materials were prepared through the electrospinning method and then calcination at 500 °C, for 2 h. The obtained electrospun ZnO:MoO3 hybrid materials were characterized by X-ray diffraction, scanning and transmission electron microscopies, ultraviolet (UV)-diffuse reflectance, UV–visible (UV–vis) absorption, and photoluminescence techniques. It was observed that the presence of MoO3 as loading material in pure ZnO matrix induces a small blue shift in the absorption band maxima (from 382 to 371 nm) and the emission peaks are shifted to shorter wavelengths, as compared to pure ZnO. Also, a slight decrease in the optical band gap energy of ZnO:MoO3 was registered after MoO3 incorporation. The photocatalytic performance of pure ZnO and ZnO:MoO3 was assessed in the degradation of rhodamine B (RhB) dye with an initial concentration of 5 mg/L, under visible light irradiation. A doubling of the degradation efficiency of the ZnO:MoO3 sample (3.26% of the atomic molar ratio of Mo/Zn) as compared to pure ZnO was obtained. The values of the reaction rate constants were found to be 0.0480 h−1 for ZnO, and 0.1072 h−1 for ZnO:MoO3, respectively.

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“…The UV emission bands It can be seen that the emission spectra corresponding to sample M1 (CAB/ZnO) show several emission bands at 327 nm, 391 nm, 421 nm, 444 nm, and 484 nm, respectively. The UV emission bands from 327 nm (Figure 7a) and 350 nm (Figure 7b) can be assigned the near band edge (NBE) emission, and may be due to free exciton recombination [43]. It is known that the emission bands in the visible spectrum are due to different intrinsic defects of ZnO nanostructures, which include oxygen vacancies (V O ), zinc vacancies (V Zn ), oxygen interstitials (O i ), zinc interstitials (Zn i ) and oxygen antisites (O Zn ) [27].…”

Section: Photoluminescence Studymentioning

confidence: 99%

Innovative Low-Cost Carbon/ZnO Hybrid Materials with Enhanced Photocatalytic Activity towards Organic Pollutant Dyes’ Removal

Pascariu¹,

Olaru²,

Rotaru

et al. 2020

Nanomaterials

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A new type of material based on carbon/ZnO nanostructures that possesses both adsorption and photocatalytic properties was obtained in three stages: cellulose acetate butyrate (CAB) microfiber mats prepared by the electrospinning method, ZnO nanostructures growth by dipping and hydrothermal methods, and finally thermal calcination at 600 °C in N2 for 30 min. X-ray diffraction (XRD) confirmed the structural characteristics. It was found that ZnO possesses a hexagonal wurtzite crystalline structure. The ZnO nanocrystals with star-like and nanorod shapes were evidenced by scanning electron microscopy (SEM) measurements. A significant decrease in Eg value was found for carbon/ZnO hybrid materials (2.51 eV) as compared to ZnO nanostructures (3.21 eV). The photocatalytic activity was evaluated by studying the degradation of three dyes, Methylene Blue (MB), Rhodamine B (RhB) and Congo Red (CR) under visible-light irradiation. Therefore, the maximum color removal efficiency (both adsorption and photocatalytic processes) was: 97.97% of MB (C0 = 10 mg/L), 98.34% of RhB (C0 = 5 mg/L), and 91.93% of CR (C0 = 10 mg/L). Moreover, the value of the rate constant (k) was found to be 0.29 × 10−2 min−1. The novelty of this study relies on obtaining new photocatalysts based on carbon/ZnO using cheap and accessible raw materials, and low-cost preparation techniques.

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Structural, diffused reflectance and photoluminescence study of cerium doped ZnO nanoparticles synthesized through simple sol–gel method

Cited by 40 publications

References 60 publications

ZnO Nanoparticles with Controllable Ce Content for Efficient Photocatalytic Degradation of MB Synthesized by the Polyol Method

ZnO Nanoparticles with Controllable Ce Content for Efficient Photocatalytic Degradation of MB Synthesized by the Polyol Method

New Electrospun ZnO:MoO3 Nanostructures: Preparation, Characterization and Photocatalytic Performance

Innovative Low-Cost Carbon/ZnO Hybrid Materials with Enhanced Photocatalytic Activity towards Organic Pollutant Dyes’ Removal

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