Microstructure and luminescence properties of Co-doped SnO2 nanoparticles synthesized by hydrothermal method

Fang, Limei; Zu, Xiaotao; Li, Z. J.; Zhu, Sha; Liu, C. M.; Wang, L. M.; Gao, Fan

doi:10.1007/s10854-007-9543-7

Cited by 82 publications

(38 citation statements)

References 26 publications

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“…linear region of a plot of (αhν) 2 versus hν gives the value of the optical band gap E g ( Table 1). The measured band gap was found to be 3.63 eV for undoped SnO 2 nanoparticles, which is similar to the reported value of the bulk SnO 2 , that is, 3.6 eV [18]. This can be attributed to the quantum confinement effect of the nanoparticles [19].…”

Section: Optical Propertiessupporting

confidence: 85%

Photocatalytic Oxidation of Carbon Monoxide over Nanocomposites under UV Irradiation

Mohamed

Aazam

2012

Journal of Nanotechnology

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The NiO/SnO 2 nanocomposites have been prepared by the simple coprecipitation method and further characterized by the XRD, SEM, TEM, UV-Vis, and BET. X-ray diffraction (XRD) data analyses indicate the exclusive formation of nanosized particles with rutile-type phase (tetragonal SnO 2 ) for Ni contents below 10 mol%. Only above 10 mol% Ni, the formation of a second NiOrelated phase has been determined. The particle size is in the range from 12 to 6 nm. It decreases with increasing amounts of doping NiO. The morphology of NiO-doped SnO 2 nanocrystalline powders is spherical, and the distribution of particle size is uniform, as seen from transmission electron microscopy (TEM). The photocatalytic oxidation of CO over NiO/SnO 2 photocatalyst has been investigated under UV irradiation. Effects of NiO loading on SnO 2 , photocatalyst loading, and reaction time on photocatalytic oxidation of CO have been systematically studied. Compared with pure SnO 2 , the 33.3 mol% NiO/SnO 2 composite exhibited approximately twentyfold enhancement of photocatalytic oxidation of CO. Our results provide a method for pollutants removal. Due to simple preparation, high photocatalytic oxidation of CO, and low cost, the NiO/SnO 2 photocatalyst will find wide application in the coming future of photocatalytic oxidation of CO.

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Section: Optical Propertiessupporting

confidence: 85%

Photocatalytic Oxidation of Carbon Monoxide over Nanocomposites under UV Irradiation

Mohamed

Aazam

2012

Journal of Nanotechnology

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“…This shows that the prepared (Ni, Al) co-doped SnO 2 samples exhibit blue emission. This is due to all the luminescent centers such as nanocrystals and intrinsic defects [26]. The 5 mol% Ni, 5 mol% Al codoped into SnO 2 shows emission peaks at 420 and 446 nm with increased intensity.…”

Section: Photoluminescence (Pl) Studiesmentioning

confidence: 96%

Synthesis and properties of (Ni, Al) co-doped nanoparticles

Reddy

Reddy³

2016

J Mater Sci: Mater Electron

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Pure and (Ni, Al) co-doped SnO 2 nanoparticles are prepared using the chemical co-precipitation method. In this procedure SnCl 2 Á2H 2 O, NiCl 2 Á6H 2 O and AlCl 2 act as precursor elements. The aqueous NH 4 OH and Poly Ethylene Glycol (PEG) are precipitate agent and stabilizing agent respectively. Pure samples and those doped with different concentration of Ni (1, 3, 5 mol%) with Al kept as constant at 5 mol% are grown. The, pH value, reaction time and reaction temperatures are optimized during synthesis. The X-ray diffraction (XRD) patterns indicate the formation of single phase tetragonal structure of pure and co-doped (Ni, Al) SnO 2 nanoparticles. From XRD calculations, the sizes of the pure and (Ni, Al) co-doped nanoparticles yield the range of 10-20 nm. The Raman studies reveal that the Raman peaks at 340, 476, 625 and 776 cm -1 , are correspond to E u , E g , A 1g and B 2g are respectively. Which are in good agreement with standard Raman vibrational modes and assign the pure and co-doped samples has tetragonal rutile phase structure. Optical absorption spectra show the absorption edge at 380 nm, in conformity with excitation and emission of PL spectra. The photoluminescence spectra (PL) exhibit the emission peaks in between 417 and 446 nm, which lie in UV and visible regions. SEM micro graphs show that the surface morphology of samples is nearly spherical, EDS spectra depicts the presence of Sn, O, Ni and Al in the chemical composition of samples in appropriate stoichiometric proportions.The transmission electron microscope micrographs show that the surface morphology of nanoparticles is spherical and average size of the nanoparticles is 20 nm. The magnetization measurements reveal that the anti ferromagnetism transferred to ferromagnetism in the prepared samples.

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“…With an increase in the Co concentration, the oxygen vacancies increased, which resulted in the broadening of the peaks along with increased peak intensity. This might be due to the electron transitions mediated by defect levels in the band gap and also due to the non-uniformity of the particle size [35]. …”

Section: Photoluminescence Analysismentioning

confidence: 99%

Investigation on structural and photoluminescence properties of (Co, Al) Co-doped SnO2 nanoparticles

Venkateswara¹,

Venkatramana²,

Sankara³

et al. 2016

Nanosystems: Phys. Chem. Math.

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Pure and (Co, Al) co-doped (Co=1, 3, 5 mol %, and Al = 5 mol % as constant) SnO 2 nanoparticles were synthesized in aqueous solution by the chemical co-precipitation method using polyethylene glycol (PEG) as a stabilizer. The effects of structural and photoluminescence of (Co, Al) co-doped SnO 2 nanoparticles are investigated. The XRD pattern reveals that the samples are in a single phase rutile type tetragonal crystalline structure of SnO 2 . The peak positions with Co concentration are slightly shifted to lower 2θ values and size of particles from XRD calculations are in between 20-30 nm. The Raman studies of the samples reveal that the Raman peaks are shifted towards lower wave numbers, when compared to those of pure SnO 2 at 150 cm −1 , 303 cm −1 , 476 cm −1 , 630 cm −1 , and 765 cm −1 respectively. Photoluminescence studies show that pure SnO 2 has an emission peak at 444 nm and (Co, Al) co-doped samples show emission peaks at 417 nm, 433 nm and 485 nm with exciting wave length 320 nm. The PL intensity increases and broadening of peaks for co-doped samples with increase of Co concentration indicates the decrease of size of the crystallinity. The UV absorption spectrum exhibits absorption at 310 nm, and is in agreement with the emission spectra.

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Microstructure and luminescence properties of Co-doped SnO2 nanoparticles synthesized by hydrothermal method

Cited by 82 publications

References 26 publications

Photocatalytic Oxidation of Carbon Monoxide over Nanocomposites under UV Irradiation

Photocatalytic Oxidation of Carbon Monoxide over Nanocomposites under UV Irradiation

Synthesis and properties of (Ni, Al) co-doped nanoparticles

Investigation on structural and photoluminescence properties of (Co, Al) Co-doped SnO2 nanoparticles

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