Synthesis, characterization and photoluminescence properties of Dy3+-doped nano-crystalline SnO2

Pillai, Sreejarani Kesavan; Sikhwivhilu, Lucky; Hillie, Thembela

doi:10.1016/j.matchemphys.2009.12.010

Cited by 57 publications

(19 citation statements)

References 29 publications

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“…3. The pure SnO 2 shows three prominent Raman peaks at 474, 632 and 772 cm −1 which are assigned to E g , A 1g and B 2g modes, respectively [27,28]. As Fe concentration increased some extra peaks are observed at 220, 287, 405, 472 and 490 cm −1 .…”

Section: Resultsmentioning

confidence: 98%

Structural and Optical Properties of Nanostructured Fe-Doped SnO₂

2016

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Nanocrystalline Sn1−xFexO2 (where x = 0, 0.01, 0.02, 0.03 and 0.04) powders have been successfully synthesized by the hydrothermal method followed by sintering at 1000• C for 3 h. The morphology and structure of the samples have been analyzed by field emission scanning electron microscope and X-ray diffraction, respectively. X-ray diffraction results revealed that all diffraction peaks positions agree well with the reflection of a tetragonal rutile structure of SnO2 phase without extra peaks. The formation of a tetragonal rutile structure of SnO2 nanostructures was further supported by the Raman spectra. The band gap of Fe-doped SnO2 nanoparticles was estimated from the diffuse reflectance spectra using the Kubelka-Munk function and it was decreasing slightly with the increase of Fe ion concentration from 3.59 to 3.52 eV. The variation in band gap is attributed predominantly to the lattice strain and particle size. The presence of chemical bonding was confirmed by the Fourier transform infrared spectra.

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Section: Resultsmentioning

confidence: 98%

Structural and Optical Properties of Nanostructured Fe-Doped SnO₂

2016

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“…nanocrystals might arise from deeper OVs [37]. The interaction of Er 3+ /F − ions in the SnO 2 lattice created changes in the vibrational modes, which are reflected in the disappeared and/or reduced Raman intensity [38]. Relaxation of the k = 0 selection rule occurs in nanocrystals when the rate of disorder increases or the size decreases, and the infrared modes become weakly active when the structural changes induced by disorder and size effects take place [39].…”

Section: Resultsmentioning

confidence: 99%

Optical and magnetic properties of (Er, F) co-doped SnO$_{2}$ nanocrystals

Kumar¹,

Uma²,

Nagarajan³

2014

Turk J Phys

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Uniformly (Er, F) co-doped SnO 2 nanocrystals, obtained by a low-temperature solution-based method, were characterized by a variety of analytical techniques. The structure, morphology, and ratio of the elements were confirmed by PXRD, SEM, and TEM analysis, respectively. From XPS analysis, atomic concentrations of Sn, O, and F were quantified. Interparticle pore size increased significantly (with a mean pore diameter of 25.82 nm) in the codoped sample. Higher in-plane oxygen vacancies and bands due to multiphonon scattering were observed in the Raman spectrum of the sample. The defect traps in the sample were experimentally determined using TL spectroscopy. A broad intense glow curve at 485 K and a weak emission at 600 K in the TL spectrum were quenched on exposure to UV radiation. A large blue shift of the exciton absorption (due to the Moss-Burstein effect) and sharp bands due to intraconfigurational f − f transitions were observed for (Er, F) co-doped SnO 2 with an estimated band gap of 4.18 eV.From the photoluminescence spectral studies, 3 types of emission centers at 471 nm, 546 nm, and 627 nm were detected.Co-doping stabilized ferromagnetism in SnO 2 at room temperature.

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“…There are adsorption bands at 3405 cm -1 ( Figure 4) due to water (OH-stretching) 36,37 . The bands between 400-1300 cm -1 can be attributed to the formation of Sn-O and carbonate species during the calcination process 38,39 . The small peak at 1627 cm -1 can be ascribed to the presence of H 2 O in the precipitated phase, as verified by Acarbas et al 38 during preparation of nanosized tin oxide (SnO 2 ) powder by homogeneous precipitation.…”

Section: Resultsmentioning

confidence: 99%