TL and PL studies on : Dy nanoparticles

Salah, Numan; Sahare, P.D.; Lochab, S.P.; Kumar, Pratik

doi:10.1016/j.radmeas.2005.07.026

Cited by 153 publications

(73 citation statements)

References 20 publications

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“…This retrapping effect also depends on the availability of empty traps. The trapping parameters of TL glow curves are calculated using the glow curve shape method (modified by Chen's) [6,14]. The equations involved in glow curve shape method are given [48].…”

Section: Annealing Effectmentioning

confidence: 99%

“…Numerous techniques such as sol gel [5], co-precipitation [6], solid state reaction [7], hydrothermal [8] and solution combustion [9][10][11] have been reported for synthesis of nanomaterials. Among these, solution combustion method has greater advantages since it produces crystalline materials at low temperature with high surface to volume ratio.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis characterization and luminescence studies of gamma irradiated nanocrystalline yttrium oxide

Shivaramu

Lakshminarasappa

Nagabhushana

et al. 2016

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Nanocrystalline Y 2 O 3 is synthesized by solution combustion technique using urea and glycine as fuels. X-ray diffraction (XRD) pattern of as prepared sample shows amorphous nature while annealed samples show cubic nature. The average crystallite size is calculated using Scherrer's formula and is found to be in the range 14-30 nm for samples synthesized using urea and 15-20 nm for samples synthesized using glycine respectively. Field emission scanning electron microscopy (FE-SEM) image of 1173 K annealed Y 2 O 3 samples show well separated spherical shape particles and the average particle size is found to be in the range 28-35 nm. Fourier transformed infrared (FTIR) and Raman spectroscopy reveals a stretching of Y-O bond. Electron spin resonance (ESR) shows V − center, O 2 − and Y 2+ defects. A broad photoluminescence (PL) emission with peak at~386 nm is observed when the sample is excited with 252 nm. Thermoluminescence (TL) properties of γ-irradiated Y 2 O 3 nanopowder are studied at a heating rate of 5 K s −1 . The samples prepared by using urea show a prominent and well resolved peak at~383 K and a weak one at~570 K. It is also found that TL glow peak intensity (I m1 ) at~383 K increases with increase in γ-dose up to~6.0 kGy and then decreases with increase in dose. However, glycine used Y 2 O 3 shows a prominent TL glow with peaks at 396 K and 590 K. Among the fuels, urea used Y 2 O 3 shows simple and well resolved TL glows. This might be due to fuel and hence particle size effect. The kinetic parameters are calculated by Chen's glow curve peak shape method and results are discussed in detail.

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Section: Annealing Effectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis characterization and luminescence studies of gamma irradiated nanocrystalline yttrium oxide

Shivaramu

Lakshminarasappa

Nagabhushana

et al. 2016

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…Endapan yang dihasilkan selanjutnya dicuci dan dikeringkan di dalam oven. Setelah kering, TLD di-annealing pada suhu 650 o C selama 1 jam di dalam furnace [7]. TLD CaSO4:Dy ini kemudian divariasikan dengan penambahkan bahan SiO2 dan PTFE (Poly Tetra Fluoro Ethylene).…”

Section: Eksperimenunclassified

Pengaruh Penambahan SiO2 dan PTFE Terhadap Respon Termolumi-nesensi TLD CaSO4:Dy

et al. 2017

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ABSTRAKTelah dilakukan pengamatan respon termoluminesensi dari TLD CaSO4:Dy dengan variasi penambahan bahan SiO2 dan PTFE. TLD CaSO4:Dy dihasilkan melalui metode ko-presipitasi kemudian ditambahkan SiO2 dan PTFE. . Setiap kegiatan yang melibatkan radiasi akan memberikan efek pada pekerja yang bersangkutan. Oleh karena itu perlu dilakukan pemantauan radiasi bagi para pekerja yang terlibat menggunakan sumber radiasi [2,3]. Alat pemantau radiasi yang biasa digunakan yaitu berupa TLD (Thermo Luminescence Dosimetre). Alat ini berfungsi mengukur seberapa besar radiasi yang diterima oleh pekerja tersebut saat bekerja menggunakan sumber radiasi. TLD berupa material yang bersifat luminesen dengan induksi panas. Banyaknya cahaya luminesensi yang tersimpan dalam sebuah TLD akan sebanding dengan besarnya radiasi yang diterima oleh TLD [4,5].Sistesis TLD telah berkembang dan menghasilkan materialmaterial baru yang memiliki karakteristik termolumisesensi. Metode dalam preparasi merupakan hal yang sangat penting karena dapat mengendalikan sifat akhir dari bahan. Metode yang umum digunakan untuk mensintesis TLD yaitu presipitasi, evaporasi, Czochralski, Zonemelting, presipitasi dari larutan atau fase cair, Chemical Vapour Deposition (CVD), spray pyrolisis dan sol-gel [6]. Pada penelitian ini akan dilakukan sintesis TLD CaSO4 dengan menggunakan doping dysprosium dengan metode ko-presipitasi. EKSPERIMENSintesis TLD CaSO4 dilakukan dengan menggunakan metode ko-presipitasi dengan mengikuti reaksi sebagai berikut:

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“…It is also noted that the intensity of a strong absorption band at 639 cm À 1 also decreases with increase in the NaF flux wt%. This may be due to formation of impurity phases in which the Si-O bond exists in SiO 4 2 À . The above results are well supported by PXRD spectra (Fig.…”

Section: Ft-ir Spectral Analysismentioning

confidence: 99%

“…It has been proved by many researchers that the luminescent properties of nanoscale materials are completely different from their bulk materials [3,4]. Thermoluminescence (TL) is a well known phenomenon used for the dosimetry of ionizing radiations.…”

Section: Introductionmentioning

confidence: 99%

Effect of NaF flux on microstructure and thermoluminescence properties of Sm3+ doped CdSiO3 nanophosphor

Manjunatha

Nagabhushana

Sunitha

et al. 2013

Journal of Luminescence

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a b s t r a c tThis work reports the preparation of CdSiO 3 :Sm 3 þ (1-7 mol%) nanophosphors by a low temperature solution combustion method. For the first time the effect of NaF flux on the crystallization behavior, morphology, and thermoluminescence property of 5 mol% Sm 3 þ doped CdSiO 3 has been investigated. The nanopowders are well characterized by powder X-ray diffraction (PXRD), Fourier Transform InfraRed (FT-IR), and scanning electron microscopy (SEM). PXRD results indicate that the powder calcined at 800 1C for 2 h has monoclinic phase. SEM results show that the powder is highly porous and the pore size and shape can be modified by the addition of NaF flux. Addition of NaF could lead to formation of particle type morphology and the increase in wt% of NaF changes crystallinity and phase. The thermoluminescence glow curves for 2-6 wt% NaF in CdSiO 3 :Sm 3 þ show a single, well resolved glow peak at 126, 130 and 150 1C, respectively. But for the sample prepared with 8 wt% of NaF flux shows two glow peaks at 148 and 220 1C. With the addition of NaF flux, TL intensity can be effectively enhanced.&

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TL and PL studies on : Dy nanoparticles

Cited by 153 publications

References 20 publications

Synthesis characterization and luminescence studies of gamma irradiated nanocrystalline yttrium oxide

Synthesis characterization and luminescence studies of gamma irradiated nanocrystalline yttrium oxide

Pengaruh Penambahan SiO2 dan PTFE Terhadap Respon Termolumi-nesensi TLD CaSO4:Dy

Effect of NaF flux on microstructure and thermoluminescence properties of Sm3+ doped CdSiO3 nanophosphor

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