The effect of Ce4+ incorporation on structural, morphological and photocatalytic characters of ZnO nanoparticles

Kannadasan, N.; Shanmugam, N.; Cholan, S.; Sathishkumar, K.; Viruthagiri, G.; Poonguzhali, R.

doi:10.1016/j.matchar.2014.08.021

Cited by 124 publications

(39 citation statements)

References 53 publications

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“…X‐ray diffraction (XRD) analysis of Fe 3 O 4 ‐PEG‐Dy 2 O 3 NPs showed a few new peaks at 2θ of 21.1, 24.7 and 35.6°, which are mainly attributed to the mixture of Fe 2 O 3 , Fe 3 O 4 and Dy 2 O 3 (Joya et al 2013; Zelati et al 2013; Özgür et al 2018). Based on the diffraction peaks at 24.7 and 35.6°, the crystallite size (D) of Fe 3 O 4 ‐PEG and Fe 3 O 4 ‐PEG‐Dy 2 O 3 NPs was estimated using the well‐known Scherrer formula, D = K·λ/β cos θ (where K is the Scherrer constant, λ, the X‐ray wavelength, β, the peak width of half maximum, and θ is the Bragg diffraction angle) (Kannadasan et al 2014). The crystallite sizes of Fe 3 O 4 ‐PEG NPs and Fe 3 O 4 ‐PEG‐Dy 2 O 3 NPs were estimated to be 12.27 and 11.98 nm, respectively.…”

Section: Resultsmentioning

confidence: 99%

Design, synthesis and antiamoebic activity of dysprosium‐based nanoparticles using contact lenses as carriers against Acanthamoeba sp.

Kusrini

Sabira

Hashim

et al. 2020

Acta Ophthalmologica

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Purpose Contact lenses have direct contact with the corneal surface and can induce sight‐threatening infection of the cornea known as Acanthamoeba keratitis. The objective of this study was to evaluate the dysprosium‐based nanoparticles (Dy‐based NPs), namely Fe3O4‐PEG‐Dy2O3 nanocomposites and Dy(OH)3 nanorods, as an active component against Acanthamoeba sp., as well as the possibility of their loading onto contact lenses as the drug administering vehicle to treat Acanthamoeba keratitis (AK). Methods The Dy‐based NPs were synthesized, and they were loaded onto commercial contact lenses. The loading content of the NPs and their release kinetics was determined based on the absorbance of their colloidal solution before and after soaking the contact lenses. The cytotoxicity of the NPs was evaluated, and the IC50 values of their antiamoebic activity against Acanthamoeba sp. were determined by MTT colorimetric assay, followed by observation on the morphological changes by using light microscopy. The mechanism of action of the Dy‐based NPs against Acanthamoeba sp. was evaluated by DNA laddering assays. Results The loading efficiencies of the Dy‐based NPs onto the contact lens were in the range of 30.6–36.1% with respect to their initial concentration (0.5 mg ml–1). The Dy NPs were released with the flux approximately 5.5–11 μg cm–2 hr–1, and the release was completed within 10 hr. The emission of the NPs consistently showed a peak at 575 nm due to Dy3+ ion, offering the possible monitoring and tracking of the NPs. The SEM images indicated the NPs are aggregated on the surface of the contact lenses. The DNA ladder assay suggested that the cells underwent DNA fragmentation, and the cell death was due most probably to necrosis, rather than apoptosis. The cytotoxicity assay of Acanthamoeba sp. suggested that Fe3O4‐PEG, Fe3O4‐PEG‐Dy2O3, Dy(NO3)3.6H2O and Dy(OH)3 NPs have an antiamoebic activity with the IC50 value being 4.5, 5.0, 9.5 and 22.5 μg ml–1, respectively. Conclusions Overall findings in this study suggested that the Dy‐based NPs can be considered as active antiamoebic agents and possess the potential as drugs against Acanthamoeba sp. The NPs could be loaded onto the contact lenses; thus, they can be potentially utilized to treat Acanthamoeba keratitis (AK).

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Section: Resultsmentioning

confidence: 99%

Design, synthesis and antiamoebic activity of dysprosium‐based nanoparticles using contact lenses as carriers against Acanthamoeba sp.

Kusrini

Sabira

Hashim

et al. 2020

Acta Ophthalmologica

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“…This is because the energy of electrons excited to the conduction band of ZnO was transferred not to the defect-related deep levels but to the Eu 3+ ion activators to induce more photon energy absorption [32]. Further, the energy of the excited electrons in the conduction band of the ZnO is transferred to the newly created Eu 3+ ions and leads to 5d→4f transition which may account for intense visible emissions [33,34]. This is very important because it makes the Eu-doped ZnO NW array suitable as an active layer or wavelength conversion layer in optoelectronic devices, such as dye-sensitized solar cells or white light-emitting diodes.…”

Section: Resultsmentioning

confidence: 99%

Enhanced photovoltaic performance of photoanodes based on Eu-doped ZnO nanowire arrays for dye-sensitized solar cells

Gan

Yang

et al. 2015

J Solid State Electrochem

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Eu-doped ZnO nanowire (NW) arrays were grown on fluorine-doped tin oxide (FTO) substrates with assistance of hexamethylenetetramine (HMTA) and polyethylenimine (PEI) through Mannich reactions and used as photoanodes for dye-sensitized solar cells (DSCs). Structural characterizations indicate the Eu ions have been incorporated into the ZnO crystalline lattice. An overall light-to-electricity conversion efficiency (η) of 2.64 % was achieved for the DSC based on the 6 % Eu-doped ZnO NW array under AM 1.5 G illumination, and this η was found to significantly increase compared with that of the DSC with undoped ZnO NW array as the photoanode (2.01 %). Meanwhile, the fill factor (FF) of the DSC was upgraded from 63.2 to 78 %. Furthermore, the enhanced electron injection and transport abilities of Eu-doped ZnO NW arrays based on the DSC were revealed by the incident photon-to-electron conversion efficiency (IPCE) spectrum. This research demonstrates an effective way to resolve the low efficiency of DSCs due to the FF drop as well as a great potential for the expanding practical application of rare earth metals.

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“…The peak at 531.76 ev belongs to O=C-O binding (40) in Fig. 1b and the peak at 530.8 ev belongs to Zn-O binding (41) in Fig. 1c.…”

Section: Surface and Interface Analysismentioning

confidence: 97%

Facile Fabrication of Porous ZnS and ZnO Films by Coaxial Electrospinning for Highly Efficient Photodegradation of Organic Dyes

Wang

Liang

Cheng

et al. 2017

Photochem & Photobiology

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Porous ZnS and ZnO nano-crystal films were fabricated via a three-step procedure. First, Zn(CH 3 COO) 2 /Silk Fibroin nanofiber mats were prepared by coaxial electrospinning. Second, Zn(CH 3 COO) 2 /Silk Fibroin mats were immersed in NaS solution to react with S 2À to obtain ZnS/Silk Fibroin nanofiber mats. Finally, ZnO porous films were prepared by calcination of ZnS/Silk Fibroin composite mat at 600°C in air atmosphere. When ZnS/Silk Fibroin mats were calcinated in nitrogen, ZnS/Carbon composite mats were obtained accordingly. The resulting porous films were fully characterized. The ZnO porous films were the aggregation of ZnO nano-crystal with hexagonal wurtzite structure. The seize of ZnO was estimated in the range of 10-20 nm. Both of the ZnS and ZnO nano-crystal films exhibited high photocatalytic activities for the photodegradation of Methylene blue and Rhodamine B. It was also found that ZnO porous films are better than ZnS/Carbon nanofiber mats. In addition, photocatalysis of a real wastewater sample from a printing and dyeing company was conducted. The ZnO porous films exhibited excellent performance to treat the real samples. Moreover, the porous ZnO nano-crystal photocatalyst could easily be recycled without notable loss of catalysis ability.

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The effect of Ce4+ incorporation on structural, morphological and photocatalytic characters of ZnO nanoparticles

Cited by 124 publications

References 53 publications

Design, synthesis and antiamoebic activity of dysprosium‐based nanoparticles using contact lenses as carriers against Acanthamoeba sp.

Design, synthesis and antiamoebic activity of dysprosium‐based nanoparticles using contact lenses as carriers against Acanthamoeba sp.

Enhanced photovoltaic performance of photoanodes based on Eu-doped ZnO nanowire arrays for dye-sensitized solar cells

Facile Fabrication of Porous ZnS and ZnO Films by Coaxial Electrospinning for Highly Efficient Photodegradation of Organic Dyes

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