Photoacoustic spectra on Pr doped ZnO powders

Inoué, Yoshihiro; Okamoto, Masaki; Kawahara, Toshio; Morimoto, Jun

doi:10.1016/j.jallcom.2004.12.182

Cited by 20 publications

(16 citation statements)

References 18 publications

(44 reference statements)

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“…Nanostructured zinc oxide (ZnO) is a versatile and technologically interesting semiconductor materials to study because it possesses very attractive physical properties such as a wide, direct band gap (3.37 eV), a large exciton binding energy of 60 meV at room temperature, and unique acoustic, catalytic, and electronic properties. Because of such versatile properties, it has great potential in applications such as room-temperature UV lasers, light-emitting diodes (LED), field-effect transistors, solar cells, sensors, and optoelectronics .…”

Section: Introductionmentioning

confidence: 99%

Ascorbate-Assisted Growth of Hierarchical ZnO Nanostructures: Sphere, Spindle, and Flower and Their Catalytic Properties

et al. 2010

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A simple solution-based method to prepare mainly flowerlike zinc oxide (ZnO) nanostructures using the ascorbate ion as a shape-directing/capping agent at relatively low temperature (ca. 30 and 60 degrees C) was described. However, we observed that different shapes of hierarchical ZnO nanostructures such as flowerlike, spindlelike, and spherical could be obtained with an increase in the synthesis temperature from 60 to 90 degrees C. The effects of other organic capping agents on the shape of hierarchical ZnO nanostructures were also studied. FTIR, FESEM, and XRD characterization were performed on the formed ZnO nanostructures to understand the role of ascorbate in the growth of flowerlike morphology. The nucleation and growth process can regulate by changing the metal precursor and ascorbate ion concentrations. We were able to identify intermediate nanostructures such as spherical/quasi-spherical and spindle that are very much on the pathway of formation of large, flowerlike ZnO nanostructures. Electron microscopy results indicated that these spherical/quasi-spherical ZnO nanoparticles might aggregate through oriented attachment to produce spindlelike and flowerlike nanostructures. On the basis of these results, a possible growth mechanism for the formation of flowerlike ZnO nanostructures was described. The optical properties of these differently shaped ZnO nanostructures were also described. The catalytic activities of the as-synthesized spherical and flowerlike ZnO nanostructures were tested in the Friedel-Crafts acylation reaction of anthracene with benzoyl chloride. The catalysis results indicated that the catalytic activity of flowerlike ZnO nanostructures is slightly higher than the spherical counterpart.

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Section: Introductionmentioning

confidence: 99%

Ascorbate-Assisted Growth of Hierarchical ZnO Nanostructures: Sphere, Spindle, and Flower and Their Catalytic Properties

et al. 2010

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“…The absorbance was monitored at 254 nm. 1 H spectra of R6G and the photodegraded R6G in CDCl 3 were acquired using a Bruker DPX 300 MHz spectrometer.…”

Section: Characterizationmentioning

confidence: 99%

Ionic liquid-based solvent-induced shape-tunable small-sized ZnO nanostructures with interesting optical properties and photocatalytic activities

2014

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“…nadir toprak metali katkılı ZnO yarı iletken malzemeler üzerine yapılan araştırmalar son yıllarda hız kazanmıştır [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Düşük oranlarda Pr katkılanması bile, ZnO nanoyapıların, optoelektrik performansını, fotokatalitik aktivitesini, fotoelektrik ve lüminesans özelliklerini iyileştirebilmektedir [17][18][19].Özellikle Pr 3+ iyonu katkılanmasıyla ZnO tabanlı yarıiletken malzemelerin buharlaşma, faz saflığı oluşumu, tane büyümesi ve elektrik akımının etkin akışı gibi özelliklerindeki değişim etkileri kullanılarak Bi2O3 tabanlı ZnO varistörlerindeki dezavantajlar giderilmektedir [20][21][22]. Ayrıca, Pr 3+ dalga boyu emisyonu maviden kızılötesi bölgeye kadar ayarlanabilir özelliğinden dolayı, ışık yayıcıların yanı sıra, varistör uygulamaları için fotovoltaikte aşağı dönüştürücü bir malzeme olarak da kullanılabilir [23][24][25][26][27].…”

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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Photoacoustic spectra on Pr doped ZnO powders

Cited by 20 publications

References 18 publications

Ascorbate-Assisted Growth of Hierarchical ZnO Nanostructures: Sphere, Spindle, and Flower and Their Catalytic Properties

Ascorbate-Assisted Growth of Hierarchical ZnO Nanostructures: Sphere, Spindle, and Flower and Their Catalytic Properties

Ionic liquid-based solvent-induced shape-tunable small-sized ZnO nanostructures with interesting optical properties and photocatalytic activities

Pr3+ Katkılı ZnO Nanoparçacıkların Hidrotermal Yöntemle Sentezi ve Karakterizasyonu

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