Reduction of Eu2+-activated nanoparticles by unique TCRA treatment

Hong, Byung‐Chul; Kawano, Katsuyasu

doi:10.1016/j.jallcom.2007.04.056

Cited by 15 publications

(18 citation statements)

References 15 publications

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“…The displayed peaks correspond to <h k l> values (1 1 1), (2 2 0), (3 1 1), (4 0 0), (3 1 1) and (4 2 2). The results match well with literature [7,8].Using the <h k l> values the lattice constant (a) of the sample was calculated. The average value of lattice constant was found to be a=5.454Å which is in good agreement with literature value a= 5.4355Å [9].…”

Section: Methodssupporting

confidence: 87%

Optical absorption and Photoluminescence studies in Gamma-irradiated nanocrystalline CaF2

urangappa¹,

Lakshminarasappa²

2011

J Nanomedic Nanotechnol

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Calcium fluoride (CaF 2 ) nanoparticles were synthesized by co-precipitation method and characterized by powder X-ray diffraction (PXRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM). Also, optical absorption (OA) and photoluminescence (PL) studies on gamma irradiated (γ-rayed) CaF 2 nanoparticles were carried out. The XRD patterns confirmed the cubic crystallinity of the samples and the particle size was found to be ~25 nm. The purity of the synthesized nanoparticles was confirmed by FTIR spectrum. The morphological features studied using SEM revealed the agglomerated and porous nature of nanoparticles. γ-rayed CaF 2 nanoparticles showed a prominent absorption with a peak at ~360 nm besides three weak but well separated absorptions at ~ 267, 442 and 510 nm. The various defect centers responsible for the absorption peaks were identified. The PL studies of samples showed strong emissions at ~396 nm and 425 nm. The observed PL emissions are attributed to defects created in nanocrystalline CaF 2 .Citation: Pandurangappa C, Lakshminarasappa BN (2011) Optical absorption and Photoluminescence studies in Gamma-irradiated nanocrystalline CaF 2 .

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Section: Methodssupporting

confidence: 87%

Optical absorption and Photoluminescence studies in Gamma-irradiated nanocrystalline CaF2

urangappa¹,

Lakshminarasappa²

2011

J Nanomedic Nanotechnol

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“…However reports on synthesis of fluoride nanoparticles are limited. CaF 2 nanoparticles were synthesized by different methods such as sol-gel method [11][12][13][14][15][16], solvothermal process [17,18], reverse micelle method [19,20], different precipitation methods [21][22][23][24], and flame synthesis [25]. Chemical co-precipitation is a simple method to synthesize fluoride nanocompounds.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of CaF2 nanocrystals

Pandurangappa¹,

Lakshminarasappa

Nagabhushana

2010

Journal of Alloys and Compounds

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“…Recently, we studied the effect of TCRA treatment on Eu-doped nanoparticle, where the Eu ions were reduced to divalent state above 700°C [20]. We reports that the synthesis of Eu-doped CaF 2 nanoparticles using the TFA, the temperature and time dependence on the modified TCRA treatment reducing an active Eu ion to divalent state above 600°C in the present study.…”

Section: Introductionmentioning

confidence: 57%

“…Thus, the modified TCRA treatment provided an efficient reduction from Eu 3+ to Eu 2+ using simple and inexpensive components. In our previous work [20], we reported that the reduction to Eu 2+ has started above 700°C by an initial modified TCRA treatment. We arranged, however, TCRA treatment in the present study, in which amount of activated carbon was changed up to as much as six times larger than those of previous work.…”

Section: Resultsmentioning

confidence: 88%