High photoactive TiO 2 /SnO 2 nanocomposites prepared by laser pyrolysis

Scarisoreanu, M.; Fleaca, C.; Morjan, I.; Niculescu, A.; Luculescu, C.; Dutu, Elena; Ilie, Alina; Morjan, I.; Florescu, L. Gavrila; Vasile, Eugeniu; Fort, Carmen Ioana

doi:10.1016/j.apsusc.2016.12.122

Cited by 35 publications

(15 citation statements)

References 36 publications

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“…Ignoring the possible interaction, the 2 stronger absorbance correspond to 2 optical band‐gap energy (Eg, eV), respectively, and the Eg(M) (where M is the matrix) is greater than the Eg(R) (where R is the rutile structure). The Eg is calculated by the following equations:

{()(, normalα normalhv)}^{1 / 2} = A (h v - {normalE}_{normalg})

F (normalR) = \frac{{()(, 1 - normalR)}^{2}}{2 R}

F (normalR) \propto α

C {()(, normalF ()(, R) h v)}^{1 / 2} = h v - {normalE}_{normalg}

where α, v , R, and h denote the absorption coefficient, light frequency, reflectance, and Planck constant, respectively. A and C are constants.…”

Section: Resultsmentioning

confidence: 99%

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0.73ZrTi₂O₆–0.27MgNb₂O₆ microwave dielectric ceramics modified by Al₂O₃ addition

Zeng

Luo

et al. 2018

J Am Ceram Soc

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0.73ZrTi2O6–0.27MgNb2O6 ceramics with various Al2O3 contents (0‐2.0 wt%) were prepared by conventional ceramic route. The effects of Al2O3 on the phase composition, microstructure, conductivity, and microwave dielectric properties were systematically investigated. The coexistence of a disordered α–PbO2‐type phase and a rutile second phase was found in all compact ceramics with low Al2O3 contents (x = 0, 0.5, and 1.0 wt%), while a corundum phase was detected when Al2O3 additive increased to 1.5 and 2.0 wt% based on X‐ray diffraction results. With the addition of Al2O3, the decreased grain size of the matrix phase was observed using field‐emission scanning electron microscope, accompanied with increased resistivity and band‐gap energy. Additionally, Al2O3 additives efficiently improved the quality factor of the ceramics. After sintering at 1360°C for 3 hours, the ceramic with 1.0 wt% Al2O3 exhibited excellent microwave dielectric properties: a dielectric constant of 43.8, a quality factor of 33 900 GHz (at 6.6 GHz), and a near‐zero temperature coefficient of resonant frequency (3.1 ppm/°C).

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{()(, normalα normalhv)}^{1 / 2} = A (h v - {normalE}_{normalg})

F (normalR) = \frac{{()(, 1 - normalR)}^{2}}{2 R}

F (normalR) \propto α

C {()(, normalF ()(, R) h v)}^{1 / 2} = h v - {normalE}_{normalg}

where α, v , R, and h denote the absorption coefficient, light frequency, reflectance, and Planck constant, respectively. A and C are constants.…”

Section: Resultsmentioning

confidence: 99%

“…Ignoring the possible interaction, the 2 stronger absorbance correspond to 2 optical band-gap energy (Eg, eV), respectively, and the Eg(M) (where M is the matrix) is greater than the Eg (R) (where R is the rutile structure). The Eg is calculated by the following equations 27,28 :…”

mentioning

confidence: 99%

0.73ZrTi₂O₆–0.27MgNb₂O₆ microwave dielectric ceramics modified by Al₂O₃ addition

Zeng

Luo

et al. 2018

J Am Ceram Soc

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“…The nanomaterial possesses small diameter without any agglomeration of particles [150]. Nanomaterials formed by this method include spherical-shaped N-doped and Au-loaded TiO 2 arranged in chain geometry and partially facetted TiO 2 / SnO 2 [151,152].…”

Section: Laser Pyrolysismentioning

confidence: 99%

A review on the progress of nanostructure materials for energy harnessing and environmental remediation

et al. 2018

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The nanostructured materials offer various advantages as they provide more flexible space for ease reconstruction, as their nanosize expands the limits and results in confinement effect, enhanced mechanical stability, and large surface area, and make them suitable for photocatalytic activities. The advancement in synthesis techniques provides the freedom to alter its physical properties as per the demand. This article provides a 360° view point on the nanomaterials which are used for solar energy harnessing with respect to environmental and energy application. The discussion emphasizes on various synthesis methods of nanostructured materials, their mechanistic features, usage in demanding applications such as photosplitting of water for hydrogen production, artificial photosynthesis, and water and wastewater treatment with an endnote highlighting the future scope of nanomaterials for real-world applications.

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“…Doping TiO 2 with metal ions lowers the probability of electron–hole recombination and improves interphase charge transfer, thus increasing the photocatalytic efficiency [ 3 , 9 ]. Researchers have proposed a number of photocatalytic TiO 2 systems mixed with ZnO [ 10 ], Cu 2 O [ 11 ], ZrO 2 [ 12 ], SnO 2 [ 13 ], WO 3 [ 14 ], and CeO 2 [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Activity of Fibrous Ti/Ce Oxides Obtained by Hydrothermal Impregnation of Short Flax Fibers

et al. 2021

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Fibrous Ti/Ce oxide photocatalysts were prepared for the first time by a biomimetic solution process using short flax fibers (flax straw processing waste) as a biotemplate. Titanium polyhydroxy complex solutions with 3% and 5% cerium were used as precursors. Flax fibers were impregnated in an autoclave under hydrothermal conditions. Ti/Ce oxides were obtained from the biotemplate by annealing at 600 °C. The photocatalytic activity of the Ti/Ce oxides was studied by the adsorption and decomposition of the dye rhodamine B under UV irradiation. The photocatalytic decomposition of the dye was 50% and 75% faster for Ti/Ce oxides with 3% and 5% Ce, respectively, than for the analogous undoped fibrous TiO2. The morphologies, textures, and structures of the photocatalysts were studied by scanning electron microscopy, low temperature N2 adsorption/desorption, UV-Vis spectroscopy, and X-ray and XPS analytical methods. It was shown that the introduction of Ce into the precursor solution increased the surface irregularity of the Ti/Ce oxide crystallites compared to pure TiO2. This effect scaled with the Ce concentration. Ce improved the UV light absorption of the material. The Ti/Ce oxides contained Ce4+/Ce3+ pairs that played an important role in redox processes and intensified the photocatalytic activity.

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High photoactive TiO 2 /SnO 2 nanocomposites prepared by laser pyrolysis

Cited by 35 publications

References 36 publications

0.73ZrTi₂O₆–0.27MgNb₂O₆ microwave dielectric ceramics modified by Al₂O₃ addition

0.73ZrTi₂O₆–0.27MgNb₂O₆ microwave dielectric ceramics modified by Al₂O₃ addition

A review on the progress of nanostructure materials for energy harnessing and environmental remediation

Photocatalytic Activity of Fibrous Ti/Ce Oxides Obtained by Hydrothermal Impregnation of Short Flax Fibers

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High photoactive TiO 2 /SnO 2 nanocomposites prepared by laser pyrolysis

Cited by 35 publications

References 36 publications

0.73ZrTi2O6–0.27MgNb2O6 microwave dielectric ceramics modified by Al2O3 addition

0.73ZrTi2O6–0.27MgNb2O6 microwave dielectric ceramics modified by Al2O3 addition

A review on the progress of nanostructure materials for energy harnessing and environmental remediation

Photocatalytic Activity of Fibrous Ti/Ce Oxides Obtained by Hydrothermal Impregnation of Short Flax Fibers

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Product

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0.73ZrTi₂O₆–0.27MgNb₂O₆ microwave dielectric ceramics modified by Al₂O₃ addition

0.73ZrTi₂O₆–0.27MgNb₂O₆ microwave dielectric ceramics modified by Al₂O₃ addition