Microwave Assisted Synthesis of Pure and Ag Doped SnO2 Quantum Dots as Novel Platform for High Photocatalytic Activity Performance

Parthibavarman, M.; Sathishkumar, S.; Jayashree, M.; BoopathiRaja, R.

doi:10.1007/s10876-018-01493-5

Cited by 78 publications

(23 citation statements)

References 30 publications

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“…This technique is complementary to the conventional approaches of waste water treatment such as filtration and sedimentation [1]. Wide band-gap semiconductors such as TiO 2 , ZnO, SnO 2 , WO 3 , Fe 2 O 3 , CdS and NiO are some of the most actively investigated systems as photocatalysts for water purification [2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic activity of ZnO–NiO nanocomposites synthesized through a facile sonochemical route

et al. 2019

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Formation of heterostructures with p-type oxides such as NiO and CuO is one of the effective methods for improving the photocatalytic performance of ZnO. Such systems are often synthesized through template-based growth techniques that involve many steps. We have prepared ZnO-NiO composites through a facile, template-free, low-temperature sonochemical route. High-resolution transmission electron microscopy analysis indicates the formation of ZnO-NiO heterostructures. Photocatalytic activity of ZnO-NiO nanocomposites in the decomposition of methylene blue dye under solar irradiation is found to be much larger than that of both pure ZnO (1.26 × 10 −2 min −1 ) and NiO (0.31 × 10 −2 min −1 ) establishing synergistic effects. The rate constant increases with increase in the percentage of NiO in the composite and is 6.00 × 10 −2 min −1 for sample with the highest percentage of NiO. Rate constants for the second and third runs are estimated to be 4.4 × 10 −2 and 4.2 × 10 −2 min −1 which are promising. The main mechanism of enhancement of photocatalytic activity of the composites is identified as the more effective separation of the photogenerated free charge carries due to the internal electric field at the ZnO-NiO interface. Sharp decrease in the relative intensity of the band-band emission of ZnO at ~ 380 nm in the case of composite samples and analysis of the relative position of the conduction band and valence band edges of ZnO and NiO support the proposed mechanism.

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Section: Introductionmentioning

confidence: 99%

Enhanced photocatalytic activity of ZnO–NiO nanocomposites synthesized through a facile sonochemical route

et al. 2019

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“…These peaks are found for both SnO 2 and Ag‐SnO 2 samples (Figure ). The A 1g vibrational mode at 629 cm −1 can be assigned to the tetragonal rutile structure . The PXRD studies also confirm this structure.…”

Section: Resultsmentioning

confidence: 52%

Surface plasmon resonance effect of Ag metallized SnO₂ particles: Exploration of metal induced gap states and characteristic properties of Ohmic junction

Shyamala

Devi

2020

Surface & Interface Analysis

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Ag metallization on the surface of SnO 2 catalyst was performed by the photoreduction method, and its presence was confirmed by the (111), (200), (220), and (311) hkl planes of Ag metal by powder X-ray diffraction technique. Further lattice parameters "a" and "c" of the SnO 2 tetragonal unit cell show prominent changes on metallization. Ultraiolet-visible absorption spectrum of Ag-SnO 2 shows the extended adsorption in the visible region up to almost~565 nm due to the surface plasmon resonance (SPR) effect. Percentage composition of the elements present in the SnO 2 and Ag-SnO 2 samples were confirmed by the energy-dispersive X-ray analysis and the inductively coupled plasma-atomic emission spectroscopic analysis techniques, and the spherical morphology of these samples were confirmed by the scanning electron microscopy. The photoluminescence technique confirms the reduction of recombination of photogenerated charge carriers by 44% in the case of Ag-SnO 2 . The metal-metal oxide contact was found to be Ohmic rather than Schottky. The higher activity of the Ag-SnO 2 nanoparticles are correlated to the SPR effect, metal-induced gap states, inherently created structural defects, the ability of Sn to show multiple oxidation states, variation in the surface oxygen concentration, and also to the Ohmic junction. Synergistic effect between electronic/intrinsic defect energy levels of Ag-SnO 2 photocatalyst with the redox potential of the fast red dye leads to the higher quantum efficiency. K E Y W O R D S band bending, charge carriers, metal deposition, metal-induced gap states, Ohmic junction, photocatalysis, surface plasmon resonance effect

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“…The exploited FeNi 2 S 4 nanoparticles on the 2D rGO sheets could signi cantly improve the pore size and surface area. Moreover, the calculated pores and type IV isotherm with H3 hysteresis curve clearly demonstrate that fabricated lms are highly mesoporous nature[25][26][27][28][29][30].…”

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confidence: 83%

Design and Fabrication of Pt Free FeNi2S4/rGO  Hybrid Composite Thin Films Counter Electrode for High Performance Dye Sensitized Solar Cells 

Sankar

Anbarasu

Mahendran

et al. 2021

Preprint

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In this report, for the first time synthesized FeNi2S4/rGO composite as Pt free counter electrode (CE) by facile hydrothermal method without employing template or surfactant. Complete investigations of phase evolutions by XRD patterns and TEM indicate that spinel structure with nanosheets and nanospherical morphologies. The individual spherical shaped nanoparticles (30-35 nm) of FeNi2S4 were exploited on the 2D ultrathin rGO nanosheets surface. This is useful for the provision of further electrolyte adsorptions and responsive electrocatalytic sites. The DSSC constructed with FeNi2S4/rGO hybrid composite CE showed a conversion efficiency of 9.98%, better than that by FeNi2S4 CE (4.87%) and also commercial Pt (6.21%). The outstanding efficiency of the FeNi2S4/rGO hybrid composite CE even better than commercial Pt is effective alternative to Pt CE in the DSSCs.

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Microwave Assisted Synthesis of Pure and Ag Doped SnO2 Quantum Dots as Novel Platform for High Photocatalytic Activity Performance

Cited by 78 publications

References 30 publications

Enhanced photocatalytic activity of ZnO–NiO nanocomposites synthesized through a facile sonochemical route

Enhanced photocatalytic activity of ZnO–NiO nanocomposites synthesized through a facile sonochemical route

Surface plasmon resonance effect of Ag metallized SnO₂ particles: Exploration of metal induced gap states and characteristic properties of Ohmic junction

Design and Fabrication of Pt Free FeNi2S4/rGO  Hybrid Composite Thin Films Counter Electrode for High Performance Dye Sensitized Solar Cells

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Microwave Assisted Synthesis of Pure and Ag Doped SnO2 Quantum Dots as Novel Platform for High Photocatalytic Activity Performance

Cited by 78 publications

References 30 publications

Enhanced photocatalytic activity of ZnO–NiO nanocomposites synthesized through a facile sonochemical route

Enhanced photocatalytic activity of ZnO–NiO nanocomposites synthesized through a facile sonochemical route

Surface plasmon resonance effect of Ag metallized SnO2 particles: Exploration of metal induced gap states and characteristic properties of Ohmic junction

Design and Fabrication of Pt Free FeNi2S4/rGO&nbsp; Hybrid Composite Thin Films Counter Electrode for High Performance Dye Sensitized Solar Cells&nbsp;

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Surface plasmon resonance effect of Ag metallized SnO₂ particles: Exploration of metal induced gap states and characteristic properties of Ohmic junction

Design and Fabrication of Pt Free FeNi2S4/rGO Hybrid Composite Thin Films Counter Electrode for High Performance Dye Sensitized Solar Cells