Strong blue emission from ZnO nanocrystals synthesized in acetone-based solvent

Efafi, Babak; Ara, M.H. Majles; Mousavi, Seyedeh Soraya

doi:10.1016/j.jlumin.2016.06.026

Cited by 21 publications

(3 citation statements)

References 23 publications

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“…A similar blue–violet emission of ZnO NPs (λ em = 411 nm at λ ex = 320 nm) was studied by Efafi B. [ 20 ]. The authors attribute this effect to the density of oxygen vacancies decreasing due to acetone used as a solvent in the synthesis.…”

Section: Resultsmentioning

confidence: 66%

The New Pharmaceutical Compositions of Zinc Oxide Nanoparticles and Triterpenoids for the Burn Treatment

et al. 2020

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We studied oleogels containing zinc oxide nanoparticles (ZnO NPs) and lupane triterpenoids in sunflower oil for the treatment of burns. The modification of ZnO was carried out by treatment with alcohol solutions of betulin, betulonic acid, betulin diacetate and betulin diphosphate. The properties of modified ZnO NPs were studied by powder XRD (average sizes of 10–20 nm), FTIR (νZnO 450 cm−1), UV–vis (345–360 nm), and blue–violet emission (380–420 nm). The identification and assay of modified ZnO NPs and triterpenoids were estimated. The treatment by oleogels of deep II-degree burns was studied on rats using histological studies, Doppler flowmetry and evaluation of enzymes activity and malonic dialdehyde (MDA) level. After the action of oleogels, burn wound area, and the necrosis decreased twice on the 10th day in comparison with the 1st day after burn. The microcirculation index in the near-wound zone by 20–30% improved compared with the group without treatment. Evaluation of the enzyme activity and the MDA level after treatment by oleogels during the course of 10 days showed them returning to normal. The improvement of antioxidant biochemical indexes, as well as wounds’ healing, was mainly determined by the influence of zinc oxide nanoparticles.

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Section: Resultsmentioning

confidence: 66%

The New Pharmaceutical Compositions of Zinc Oxide Nanoparticles and Triterpenoids for the Burn Treatment

et al. 2020

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“…The PL spectra of the samples are shown in Figure . We have studied PL of some materials in recent research. − From this research, we can determine energy levels and band gaps in the structures of the samples using the PL spectrum. Decreasing the area of graphene sheets disrupts the integrity and interference of π orbital electrons in the system and the emergence of quantum limitation effects that gives rise to particular optical properties depending on the size of the sheets.…”

Section: Resultsmentioning

confidence: 99%

Preparing a New Class of Ultrathin Graphene Nanostructure by Chemical Vapor Deposition and Its Lasing Ability

Tehrani

Efafi

Ara

2020

ACS Appl. Mater. Interfaces

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In this paper, we report a new method to grow graphene monolayers directly on a quartz substrate using chemical vapor deposition (CVD), without using any catalyst. For this purpose, ethanol as the precursor and a quartz substrate were used for growth, which controlled the growth process and the formation of an ultrathin layer of graphene. In this project, with use of plasmaenhanced chemical vapor deposition (PECVD), the substrate was cleaned by applying the cold plasma with the aim of improving the quality of the graphene monolayer grown. Atomic force microscopy (AFM) and Raman spectroscopy confirm that the graphene layer in regular triangular pieces grew to 200 nm in size. Photoluminescence spectroscopy (PL) of the samples showed a sharp peak in the blue spectrum, which indicates lasing emission in the graphene nanostructure. Finally, at a lower cost than other CVD methods, we have formed an ultrathin graphene layer on a dielectric substrate that can have many applications in the laser and photonics fields.

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“…To date, several physical and chemical methods have been used to prepare ZnO with strong blue emission via sol gel method [17], spray pyrolysis method [18]. In the present work, a violet to blue emission luminescence ZnO spectrum was obtained by variating the amount of Ca 2+ dopant.…”

Section: Introductionmentioning

confidence: 95%