Luminescence and spectroscopic investigations on Gd3+ doped ZnO nanophosphor

Reddy, G.K.N.; Reddy, A. Jagannatha; Krishna, R. Hari; Nagabhushana, B.M.; Gopal, G. Ram

doi:10.1016/j.jascer.2017.06.008

Cited by 63 publications

(15 citation statements)

References 20 publications

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“…Data obtained from XRD analysis were in agreement with the JCPDS PDF no 36–1451 for the standard hexagonal polycrystalline structure of ZnO 55. The results for green synthesized ZnO NPs were in good agreement with commercially available ZnO NPs (30 nm).…”

Section: Discussionsupporting

confidence: 82%

Effect of commercial and green synthesized ZnO NPs in murine model of chloroquine-induced pruritus

Aman¹,

Rauf²,

Khan³

et al. 2019

IJN

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Purpose: To investigate the effects of zinc oxide nanoparticles (ZnO NPs) on chloroquine (CQ)-induced itching, and overall behavior of mice after oral administration of ZnO NPs of various sizes and doses. Background: With the wide-spread use of ZnO NPs in pharmaceuticals and cosmetics, concerns about their safety and toxicity are also increasing. Multiple aspects of ZnO NPs regarding cytotoxicity and tolerability are under investigation globally. Still, a clear conclusion about their safety has not been reached. Chloroquine phosphate is an antimalarial with known side effects of itching in humans and animals. In this study, CQ was used to induce itching in mice, and the effects of ZnO NPs on scratching and other neurological behavior of mice were observed. Methods: Female BALB/c mice were divided into eleven groups of six mice each. ZnO NPs of various sizes and doses were administered orally 1 hour before CQ (32 mg/kg body weight) was administered subcutaneously. The effect of ZnO NPs on CQ-induced pruritus was observed for the next 30 minutes. Simultaneously, overall behavioral changes (socialization and locomotion) were also recorded using a video camera. Results: A significant reduction ( P ˂0.001) in scratching bouts was observed at all three doses of ZnO NPs (particle sizes 100, 30 nm, and green synthesized 30 nm). Locomotion was reduced significantly ( P ˂0.001) in ZnO NPs-treated groups in comparison to normal saline and CQ group, additionally, a significant increase in socialization ( P ˂0.05) was observed in ZnO NP-treated groups as compared to CQ group. Conclusion: ZnO NPs, instead of aggravating the dermatological condition, ameliorated the pruritus. All sizes of ZnO NPs used significantly improved socialization among mice and reduced locomotion activity.

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Section: Discussionsupporting

confidence: 82%

Effect of commercial and green synthesized ZnO NPs in murine model of chloroquine-induced pruritus

Aman¹,

Rauf²,

Khan³

et al. 2019

IJN

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“…By studying the literature, it is revealed that the hexagonal wurtzite structure (JCPDF file NO. 00-036-1451) [ 56 ] of the particles was confirmed by Miller indexation. Similar results regarding size and shape were also reported in previous studies [ 57 , 58 , 59 , 60 ].…”

Section: Discussionmentioning

confidence: 91%

Bio-Assisted Synthesis and Characterization of Zinc Oxide Nanoparticles from Lepidium sativum and Their Potent Antioxidant, Antibacterial and Anticancer Activities

et al. 2022

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Nanotechnology is an emerging area of research that deals with the production, manipulation, and application of nanoscale materials. Bio-assisted synthesis is of particular interest nowadays, to overcome the limitations associated with the physical and chemical means. The aim of this study was to synthesize ZnO nanoparticles (NPs) for the first time, utilizing the seed extract of Lepidium sativum. The synthesized NPs were confirmed through various spectroscopy and imagining techniques, such as XRD, FTIR, HPLC, and SEM. The characterized NPs were then examined for various in vitro biological assays. Crystalline, hexagonal-structured NPs with an average particle size of 25.6 nm were obtained. Biosynthesized ZnO NPs exhibited potent antioxidant activities, effective α-amylase inhibition, moderate urease inhibition (56%), high lipase-inhibition (71%) activities, moderate cytotoxic potential, and significant antibacterial activity. Gene expression of caspase in HepG2 cells was enhanced along with elevated production of ROS/RNS, while membrane integrity was disturbed upon the exposure of NPs. Overall results indicated that bio-assisted ZnO NPs exhibit excellent biological potential and could be exploited for future biomedical applications. particularly in antimicrobial and cancer therapeutics. Moreover, this is the first comprehensive study on Lepidium sativum-mediated synthesis of ZnO nanoparticles and evaluation of their biological activities.

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“…The blue peak centered at 441.9 nm (2.80 eV) was due to the singly ionized Zn vacancy (V Zn − ) [ 40 ]. The blue-green peak positioned at 483.2 nm (2.56 eV) corresponded to the electronic transitions from the shallow donor levels of Zn i to the acceptor levels of neutral V Zn [ 41 ]. Additionally, the deep blue emission peak is due to the electronic transitions from the Zn i to V Zn levels due to their high symmetries [ 42 ].…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, the deep blue emission peak is due to the electronic transitions from the Zn i to V Zn levels due to their high symmetries [ 42 ]. The green PL peak at 527.6 nm (2.34 eV) was due to the radiative recombination of oxygen antisites across the conduction and valence states [ 41 ]. It was acknowledged that the green emission is due to recombining the trapped electrons in the doubly ionized O vacancies with the photo-generated holes [ 43 ].…”

Section: Resultsmentioning

confidence: 99%

Some Distinct Attributes of ZnO Nanorods Arrays: Effects of Varying Hydrothermal Growth Time

et al. 2022

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This study investigates the growth time effect on the structural, morphological, optical, and photoelectrochemical characteristics of highly oriented ZnO nanorod arrays (ZNRAs). The nanorod arrays were grown on ITO substrates using the unified sol-gel spin coating and hydrothermal techniques. ZnO nanoparticles (ZNPs) were synthesized using the sol-gel spin coating method. In contrast, the hydrothermal method was used to grow the ZnO nanorods. The hydrothermal growth time investigated was between 4 and 12 h. The synthesized ZNRAs were used as the photoanode electrodes to investigate their photoelectrochemical (PEC) electrode potency. The as-prepared ZNRAs were characterized using various analytical tools to determine their structures, morphologies, optical, and photoelectrochemical traits. EDX spectra showed the presence of uncontaminated ZnO chemical composition, and FTIR spectra displayed the various functional groups in the samples. A rod-shaped ZnO nanocrystallite with mean lengths and diameters of 300–500 nm and 40–90 nm, respectively, is depicted. HRTEM images indicated the nucleation and growth of ZNRAs with a lattice fringe spacing of 0.26 nm and a growth lattice planer orientation of [002]. The optimum ZNRAs (grown at 8 h) as photoelectrode achieved a photoconversion efficiency of 0.46% and photocurrent density of 0.63 mA/cm2, that was 17 times higher than the one shown by ZNPs with Ag/AgCl as the reference electrode. Both values were higher than those reported in the literature, indicating the prospect of these ZNRAs for photoelectrode applications.

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Luminescence and spectroscopic investigations on Gd³⁺ doped ZnO nanophosphor

Cited by 63 publications

References 20 publications

<p>Effect of commercial and green synthesized ZnO NPs in murine model of chloroquine-induced pruritus</p>

<p>Effect of commercial and green synthesized ZnO NPs in murine model of chloroquine-induced pruritus</p>

Bio-Assisted Synthesis and Characterization of Zinc Oxide Nanoparticles from Lepidium sativum and Their Potent Antioxidant, Antibacterial and Anticancer Activities

Some Distinct Attributes of ZnO Nanorods Arrays: Effects of Varying Hydrothermal Growth Time

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