The structure and photoluminescence of a ZnO phosphor synthesized by the sol gel method under praseodymium doping

Rhouma, F.I.H.; Belkhiria, F.; Bouzaiene, E.; Daoudi, M.; Taïbî, K.; Dhahri, J.; Chtourou, R.

doi:10.1039/c8ra09939a

Cited by 66 publications

(16 citation statements)

References 69 publications

(61 reference statements)

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“…The peak positions match with the reference values of hexagonal zinc oxide in JCPDS file # 36-1451 at 2θ values of 31.737° (100), 34.379° (002), 36.215° (101), 47.484° (102), 56.536° (110), and 62.777° (103). The as-confirmed formation of the wurtzite zinc oxide structure is in line with our expectations, as it is the only crystal structure reported for as-synthesized ZnO nanoparticles. − Further, it is the thermodynamically stable form of zinc oxide, while a transition of the wurtzite structure to cubic rock-salt polymorph zinc oxide (space group Fm 3 m ) is only observed when high pressure is applied (see Leitner and citations therein for a detailed discussion of the thermodynamics).…”

Section: Nanocrystalssupporting

confidence: 84%

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Microwave-Assisted Synthesis of Ultrasmall Zinc Oxide Nanoparticles

Saloga

Thünemann

2019

Langmuir

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We report on ultrasmall zinc oxide single-crystalline nanoparticles of narrow size distribution and long-term colloidal stability. These oleate-stabilized nanoparticles were synthesized using microwave-assisted synthesis for 5 min, corresponding to a 99% decrease in synthesis time, when compared to the conventional synthesis method. It was observed that the average particle radius increases from 2.6 ± 0.1 to 3.8 ± 0.1 nm upon increasing synthesis temperature from 125 to 200 °C. This change also corresponded to observed changes in the optical band gap and the fluorescence energy of the particles, from 3.44 ± 0.01 to 3.36 ± 0.01 eV and from 2.20 ± 0.01 to 2.04 ± 0.01 eV, respectively. Small-angle X-ray scattering, dynamic light scattering, and UV–vis and fluorescence spectroscopy were employed for particle characterization. Debye–Scherrer analysis of the X-ray diffraction (XRD) pattern reveals a linear increase of the crystallite size with synthesis temperature. The consideration of the convolution of a Lorentz function with a Gaussian function for data correction of the instrumental peak broadening has a considerable influence on the values for the crystallite size. Williamson–Hall XRD analyses in the form of the uniform deformation model, uniform stress deformation model, and uniform deformation energy density model revealed a substantial increase of strain, stress, and deformation energy density of the crystallites with decreasing size. Exponential and power law models were utilized for quantification of strain, stress, and deformation energy density.

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Section: Nanocrystalssupporting

confidence: 84%

“…Therefore, we restrict our evaluation in the following to the application of the UDM, USDM, and UDEDM for the purpose of better comparison with available results from the literature. 23,24,29,30,34,35 Weidenthaler emphasized that it is important to use the integral peak width, defined as…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Microwave-Assisted Synthesis of Ultrasmall Zinc Oxide Nanoparticles

Saloga

Thünemann

2019

Langmuir

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“…The particle size of the samples was calculated using Scherer's Equation

, where

is the crystal size,

is the x-ray wavelength,

is the full width at half maximum, and

is the peak position [ 20 ]. For the calculation of crystallite size, the highest intensity peak belonging to β-HgS phase was used.…”

Section: Resultsmentioning

confidence: 99%

Physico-chemical characterization of kajjali, black sulphide of mercury, with respect to the role of sulfur in its formation and structure

Joshi

Dash²,

Upadhyay

et al. 2021

Journal of Ayurveda and Integrative Medicine

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Background Kajjali is used as a base for Ayurvedic herbo-mineral medicines. It is a combination of mercury with sulfur in varying proportions. The ratio of sulfur (S) added to mercury (Hg) directly relates to the therapeutic efficacy of the compound. Objective To analyze the physico-chemical characteristics of samaguna gandhaka kajjali (Hg: S = 1:1) and shadaguna gandhaka kajjali (Hg: S = 1:6). Materials and methods X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy (XPS), Fourier transmission infrared spectroscopy, thermo-gravimetry analysis, and atomic absorption spectroscopy were applied to characterize each type of kajjali . Results It was found that the particle size of the formed kajjali compound increases with a decrease in the mercury to sulfur ratio. The presence of excess sulfur does not change the surface oxidation states as revealed by the XPS analysis. No trace of mercury has been found in both samaguna gandhaka kajjali (SGK-1) and shadguna gandhaka kajjali (SGK-6), indicating a complete Hg reaction with S. Conclusion Kajjali simulates nanomaterial of the modern era and possesses therapeutic efficacy as mentioned in classical Ayurveda texts. Complete trituration of mercury and sulfur combination ends up with this kajjali formation incorporating the potency of nanotherapeutics.

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“…Genel olarak yarı iletken malzeme sistemlerinin elektriksel ve optik özelliklerinin iyileştirilmesinde, bazı Lantanit elementlerinin katkılanmasının yanı sıra sentez yöntemleri de önemli bir rol oynamaktadır. Şimdiye kadar bahsettiğimiz Pr 3+ katkılı ZnO yarıiletken malzemeler; sol-jel [19,28], çökeltme [17], nebulizatör sprey tekniği [29], katı hal sentezi [30], basit sonokimyasal metot [31], magnetron püskürtme tekniği [1] gibi farklı yöntemlerle sentezlenmiştir. Bu yöntemler arasında hidrotermal yöntem ile sentezleme tekniği; verimli, düşük maliyetli, çevre açısından güvenli, düşük reaksiyon sıcaklığı ve katkı maddesi konsantrasyonu ile büyüme parametrelerinin kolay kontrolü gibi nedenlerden dolayı çokça kullanılmaktadır.…”

Section: Introductionunclassified

Pr3+ Katkılı ZnO Nanoparçacıkların Hidrotermal Yöntemle Sentezi ve Karakterizasyonu

Şenol

Imamoğlu

2021

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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Bu çalışmada Praseodimyum(Pr 3+ ) katkılı .01,0.02,0.03,0.04,0.05)] nanoparçacıklar kolay, hızlı ve verimli bir yöntem olan hidrotermal yöntem ile sentezlenmiştir. Sentezlenen nanoparçacıkların, kristal yapıları X-ışını kırınımıyla (XRD), yüzey morfolojileri taramalı elektron mikroskobu (SEM) ve enerji dağıtıcı X-ışını dağılımlarıyla (EDX), optik özellikleri ise dağılma yansıma (DRS UV-VIS) spektroskopisi kullanılarak karakterize edilmiştir. XRD karakterizasyonunda tüm Pr 3+ katkılı ZnO örneklerinin hekzagonal (wurzite) yapıda oluştuğu, praseodimyum veya praseodimyumoksit'e ait herhangi bir kırınım pikinin oluşmadığı gözlemlenmiştir. SEM görüntülerinden ZnO'in kristal yapısında Pr konsantrasyonu arttıkça daha yoğun ve daha kompakt halde olduğu görülmüştür. EDX sonuçlarından ise, sentezlenen örneklerin bileşiminde Zn, O ve Pr piklerinin varlığı tespit edilmiştir. Tüm numunelerin optik ölçümlerinden enerji bant aralıkları hesaplanmış ve hesaplanan enerji bant aralığı değerlerinin, praseodimyum konsantrasyonu ile arttığı görülmüştür.

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The structure and photoluminescence of a ZnO phosphor synthesized by the sol gel method under praseodymium doping

Abstract: This work outlines some interesting results regarding the effects of Pr3+ substitution on the structural and optical properties of (x = 0 and 0.02) samples.

Cited by 66 publications

References 69 publications

Microwave-Assisted Synthesis of Ultrasmall Zinc Oxide Nanoparticles

Microwave-Assisted Synthesis of Ultrasmall Zinc Oxide Nanoparticles

Physico-chemical characterization of kajjali, black sulphide of mercury, with respect to the role of sulfur in its formation and structure

Pr3+ Katkılı ZnO Nanoparçacıkların Hidrotermal Yöntemle Sentezi ve Karakterizasyonu

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