Effect of Gd doping on the structural, optical band-gap, dielectric and magnetic properties of ZnO nanoparticles

Franco, A.; Pessoni, H.V.S.

doi:10.1016/j.physb.2016.11.011

Cited by 47 publications

(12 citation statements)

References 45 publications

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“…The presence of structural defects due to the oxygen vacancies (V O ), Zn-vacancy (V Zn ), oxygen interstitial (O i ), Zn-interstitial (Zn i ) and the extrinsic impurities, which have been confirmed by photoluminescence measurements, also leads to an increase of photocatalytic efficiency for ZnO:MoO 3 (S5) sample. Similar behavior has been also reported by other authors for the Ce, Gd doped ZnO nanostructures [34][35][36]. In addition, the photocatalytic efficiency may also be due to the microstructural defects that arise in the nanostructures after doping/loading with other materials.…”

Section: Photocatalytic Propertiessupporting

confidence: 88%

“…These are compared to the materials (ZnO:MoO 3 ) presented in this work. According to the data listed in Table 4 [14,27,36,37], ZnO:MoO 3 (with 3.26% molar ratio Mo/Zn into ZnO matrix) showed a good value of the reaction rate constants (k = 0.1072 h −1 or 0.0018 min −1 ) related to other studies for similar materials. However, the advantages of these materials are degradation of dyes in visible light of low intensity, the use of a reasonable amount of catalyst (0.5 g/L), and testing the material in soft conditions without acidification of solutions, in the absence of H 2 O 2 , and degradation of dyes at room temperature, usually used to boost the photochemical reactions.…”

Section: Photocatalytic Propertiessupporting

confidence: 53%

See 1 more Smart Citation

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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Section: Photocatalytic Propertiessupporting

confidence: 88%

Section: Photocatalytic Propertiessupporting

confidence: 53%

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

Pascariu¹,

Homocianu²,

Olaru³

et al. 2020

Nanomaterials

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“…Nithyaa and Jaya reported the ferromagnetic behavior of pure TiO 2 NPs but incorporation of Gd‐ions enhanced the paramagnetic nature, which has been reported due to oxygen defects . In other reports on Gd doping in ZnO, the paramagnetism in these samples is reported due to high magnetic moment of Gd‐ions (μ = 7.1 μ B ) and due to presence of secondary phases of Gd 2 O 3 …”

Section: Resultsmentioning

confidence: 99%

“…[99] In other reports on Gd doping in ZnO, the paramagnetism in these samples is reported due to high magnetic moment of Gdions (µ = 7.1 µ B ) and due to presence of secondary phases of Gd 2 O 3 . [100][101][102] Now, the main issue herein is to understand the possible origin of ferromagnetic dominated paramagnetic behavior in pure CeO 2 and Gd-doped CeO 2 NPs, respectively. The origin of FM behavior has been discussed in this paper accounting the F-center exchange (FCE) mechanism as a subcategory of bound magnetic polaron (BMP) model.…”

Section: Gd 4d Xps Spectramentioning

confidence: 99%

Electronic Structure and Room Temperature Ferromagnetism in Gd‐doped Cerium Oxide Nanoparticles for Hydrogen Generation via Photocatalytic Water Splitting

et al. 2019

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Enhanced visible light photocatalytic activity of Gd‐doped CeO 2 nanoparticles (NPs) is experimentally demonstrated, whereas there are very few reports on this mechanism with rare earth doping. All‐pure and Gd‐doped CeO 2 NPs are synthesized using a coprecipitation method and characterized using X‐ray diffraction (XRD), absorption spectroscopy, surface‐enhanced Raman Spectroscopy (SERS), X‐ray photoelectron spectroscopy (XPS), and superconducting quantum interference device (SQUID). The effect of Gd‐doping on properties of CeO 2 is discussed along with defects and oxygen vacancies generation. The XRD confirms the incorporation of Gd 3+ at the Ce 3+ /Ce 4+ site by keeping the crystal structure same. The average particle size from transmission electron microscopy (TEM) images is in the range of 5–7 nm. The XPS spectra of Ce 3d, O 1s, and Gd 4d exhibits the formation of oxygen vacancies to maintain the charge neutrality when Ce 4+ changes to Ce 3+ . The gradual increase in hydrogen production is observed with increasing Gd concentration. The observed results are in good correlation with the characterization results and a mechanism of water splitting is proposed on the basis of analyses. The absorption spectra reveal optical band gap (2.5–2.7 eV) of samples, showing band gap narrowing leads to desired optical absorbance and photoactivity of NPs.

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“…The values of direct band gaps for doped samples are less than the undoped sample. Several reports have already been made where introduction of dopants into base material causes reduction in direct band gap value . This reduction of direct band gaps for doped samples can be attributed to the introduction of new electronic energy levels merged with the conduction band thereby reducing the band gap and also due to defects such as oxygen vacancies associated with the system.…”

Section: Resultsmentioning

confidence: 99%

Structural Interpretation of Ion Transport and Small Polaron Hopping Conduction in Gd Substituted Nickel Nanoferrites

Sinha

Dutta

2018

Physica Status Solidi (a)

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In this work, structural, optical and electrical properties of Gd‐doped Nickel ferrite nanocrystalline materials [NiFe2−xGdxO4 (x = 0.00–0.15)] prepared through citrate auto‐ignition method are reported. The X‐ray diffraction (XRD) study reveals that prepared samples are purely single phase for lower Gd concentration but for higher Gd concentration, an orthorhombic phase of GdFeO3 appears which is confirmed from Rietveld analysis. The UV–Vis study points to the semiconducting nature of the prepared samples. The electrical analysis shows that the ac conductivity of the samples increases with the increase in Gd doping concentration upto x = 0.10 and then decreases. The dielectric relaxation process is analyzed using Havriliak–Negami formalism. The existence of small polaron hopping conduction is verified using Mott's variable range hopping model.

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Effect of Gd doping on the structural, optical band-gap, dielectric and magnetic properties of ZnO nanoparticles

Cited by 47 publications

References 45 publications

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

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

Electronic Structure and Room Temperature Ferromagnetism in Gd‐doped Cerium Oxide Nanoparticles for Hydrogen Generation via Photocatalytic Water Splitting

Structural Interpretation of Ion Transport and Small Polaron Hopping Conduction in Gd Substituted Nickel Nanoferrites

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