Optical studies of samarium-doped fluoride nanoparticles

Pandurangappa, C.; Lakshminarasappa, B.N.

doi:10.1080/14786435.2011.610376

Cited by 9 publications

(2 citation statements)

References 35 publications

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“…The increase in this absorption could be due to transition between 4f and 5d levels of Sm 3? ions [19]. Moreover, for doping levels more than 7 wt%, the new absorption band of Sm 3? ions is observed at 402 nm corresponds to 6 H 5/2 ?…”

Section: Optical Absorptionmentioning

confidence: 99%

Effect of Sm3+ substitution on structural, optical and dielectric properties of hydroxypropyl cellulose films

Abdelaziz

2015

J Mater Sci: Mater Electron

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Complexes films composed of mixture of hydroxypropyl cellulose (HPC) and different concentrations of SmCl 3 were prepared by solvent casting technique. Different techniques were used to study the structural changes. The amorphousity of HPC increased with increasing Sm 3? concentration as indicated by XRD and FT-IR results. Optical absorption and fluorescence spectral analysis confirmed the presence of Sm 3? ions. Fluorescence spectra showed that the reddish-orange emission transition 4 G 5/2 ? 6 H 7/2 is more prominent. The nonlinear variation of the optical parameters with respect to Sm 3? content has been explained. The dielectric properties and ac-conductivity of these films were studied in the frequency range of 20 Hz-3 MHz at room temperature. The decrease in the dielectric constant e 0 was observed with the increase in frequency is due to dielectric dispersion. Both e 0 and dielectric loss e 00 are observed increases as Sm 3? ions concentration increased. The frequency and concentration dependence conductivity were also studied. The results showed that the conductivity increase with increasing both frequency and Sm 3? content. Real part electric modulus M 0 was lower at lower frequency but increases as frequency increased. Enhancement of both optical and electrical properties is observed which candidates the prepared films for many applications.

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Section: Optical Absorptionmentioning

confidence: 99%

Effect of Sm3+ substitution on structural, optical and dielectric properties of hydroxypropyl cellulose films

Abdelaziz

2015

J Mater Sci: Mater Electron

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“…Nonetheless, low-range analysis provided more precise results because higher angles cause distortion and hence poor precision [32]. part-CaF2 exhibited a relatively small crystallite size of about 8-14 nm, values that were slightly smaller than those reported in published data [29,33]. Besides, the average crystallite size was significantly smaller than the particle size provided by SEM micrographs (Cf.…”

Section: Diffuse Reflectance Uv-vis Spectroscopymentioning

confidence: 93%

Bimodal Ultrasound and X-ray Bioimaging Properties of Particulate Calcium Fluoride Biomaterial

et al. 2021

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Ultrasound (US) and X-ray imaging are diagnostic methods that are commonly used to image internal body structures. Several organic and inorganic imaging contrast agents are commercially available. However, their synthesis and purification remain challenging, in addition to posing safety issues. Here, we report on the promise of widespread, safe, and easy-to-produce particulate calcium fluoride (part-CaF2) as a bimodal US and X-ray contrast agent. Pure and highly crystalline part-CaF2 is obtained using a cheap commercial product. Scanning electron microscopy (SEM) depicts the morphology of these particles, while energy-dispersive X-ray spectroscopy (EDS) confirms their chemical composition. Diffuse reflectance ultraviolet-visible spectroscopy highlights their insulating behavior. The X-ray diffraction (XRD) pattern reveals that part-CaF2 crystallizes in the face-centered cubic cell lattice. Further analyses regarding peak broadening are performed using the Scherrer and Williamson–Hall (W-H) methods, which pinpoint the small crystallite size and the presence of lattice strain. X-ray photoelectron spectroscopy (XPS) solely exhibits specific peaks related to CaF2, confirming the absence of any contamination. Additionally, in vitro cytotoxicity and in vivo maximum tolerated dose (MTD) tests prove the biocompatibility of part-CaF2. Finally, the results of the US and X-ray imaging tests strongly signal that part-CaF2 could be exploited in bimodal bioimaging applications. These findings may shed a new light on calcium fluoride and the opportunities it offers in biomedical engineering.

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