Fabrication and characterization of ZnO@CdS core–shell nanostructure using acetate precursors: XRD, FESEM, DRS, FTIR studies and effects of cadmium ion concentration on band gap

Habibi, Mohammad Hossein; Rahmati, Mohammad Hossein

doi:10.1016/j.saa.2014.04.110

Cited by 87 publications

(19 citation statements)

References 27 publications

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“…The absorption peak at 457 cm -1 is associated to the stretching mode of ZnO nanoparticles at RT, annealed at 300°C and 500°C. after annealing the FTIR spectrum indicated no significant absorption peaks at higher wavelength, indicating the nature of nanoparticles formed [35,41,42].…”

Section: Fourier Transform Infrared (Ftir) and Proposed Mechanism Of mentioning

confidence: 97%

“…can be assigned to C=O, CH 3 and C=C aromatic of various bioactive compound of Sageretia thea natural extract as shown in Figure 5. Before and after the process of annealing it can be seen from the spectra that there is an intrinsic absorption band below 1000 cm -1 in the finger print region arising from inter-atomic vibrations [35,41]. The absorption peak at 457 cm -1 is associated to the stretching mode of ZnO nanoparticles at RT, annealed at 300°C and 500°C.…”

Section: Fourier Transform Infrared (Ftir) and Proposed Mechanism Of mentioning

confidence: 98%

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The Study of Structural, Physical and Electrochemical Activity of Zno Nanoparticles Synthesized by Green Natural Extracts of Sageretia Thea

Mayedwa¹,

Khalil²,

Mongwaketsi³

et al. 2017

Nano Res Appl

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In this contribution an exceptionally simple, cost effective and reliable method for biosynthesis of ZnO nanoparticles through using Sageretia thea natural extracts as an effective chelating agent. The morphological analysis shows ZnO has nanoscale particles size 28.09 nm ± 5 nm, crystalline and possess distinct nanostructure hexagonal wurtzite structure. Effects of heat on ZnO synthesised at room temperature caused bonds with in the molecule to be broken exhibited continuous weight loss with 3 quasi sharp changes and 3 endothermic peaks occurring at 79°C, 228°C and 300°C. A proposed mechanism of reaction for Zn(NO 3 ) 2 6H 2 O precursor with bioactive compounds in Sageretia thea extract such as phenolic acid, flavonoids, natural sterolin and vitamin based compounds to form ZnO nanoparticles. Electrochemically ZnO nanoparticles are electroactive by exhibiting charge transfer resistance (R ct ) 82006 Ω and bare GCE 3.7707 × 10 5 Ω. Showed good catalytic and conductivity which can be applied for pseudo capacitors.

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Section: Fourier Transform Infrared (Ftir) and Proposed Mechanism Of mentioning

confidence: 97%

Section: Fourier Transform Infrared (Ftir) and Proposed Mechanism Of mentioning

confidence: 98%

The Study of Structural, Physical and Electrochemical Activity of Zno Nanoparticles Synthesized by Green Natural Extracts of Sageretia Thea

Mayedwa¹,

Khalil²,

Mongwaketsi³

et al. 2017

Nano Res Appl

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“…It was not possible to investigate samples in transmittance mode, because Au/Si, Ag/Si, and Si substrates were not transparent. FTIR measurements of the given spectral range will not allow us to establish the fact of the formation of ZnO, because the Zn-O vibration bond at 482 cm −1 [11] is located outside of the spectral range of the measurements. The typical reflectance spectra of ZnO nanostructures reveal the absence of good resolved peaks associated with chemisorbed contaminations on the surface of ZnO nanostructures (Figure 4).…”

Section: Sem Images Ofmentioning

confidence: 99%

Solar Explosive Evaporation Growth of ZnO Nanostructures

et al. 2017

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Abstract:For the first time, we present a novel method of explosive evaporation (MEE) for the deposition of ZnO nanostructures using concentrated solar radiation for precursor evaporation. Zinc acetylacetonate powder and a mixture of ZnO with graphite powders are used as precursors for the deposition of ZnO nanostructures. ZnO nanostructures are deposited on Au/Si, Ag/Si, and unpolished Si substrates by MEE. The scanning electron microscopy, energy dispersive X-ray analysis, X-ray diffraction, Raman scattering, photoluminescence, and Fourier transformed infrared spectroscopy are used for sample characterization. We demonstrate that the changing of precursors and the substrate types allows ZnO nanostructures to be grown with diverse morphologies: hexagons, spheres, and needles. The properties of ZnO nanostructures deposited on unpolished, coated by Ag and Au silicon substrates are discussed. MME using concentrated solar radiation is promising method for applications in the semiconductor industry as an economically efficient environmentally-friendly method for the growth of nanostructures.

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“…The intensity loss of CMK-3 typical Bragg reflections is caused by the introduction of scattering material (Pt, TiO 2 , and V) into the pores [19]. The pattern of Zn-CMK-1 shows ZnO and metallic Zn signals [21,22], probably due to the reduction process not being complete. The fact that this pattern exhibits no prominent reflections is an indicator that no crystalline bulk material was formed outside the pore system.…”

Section: (Nm) D (Nm)mentioning

confidence: 99%

Synthesis and Characterization of CMK Porous Carbons Modified with Metals Applied to Hydrogen Uptake and Storage

Costa¹,

Juárez²,

Anunziata³

2016

Microporous and Mesoporous Materials

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In this chapter, we have shown that hopeful hydrogen storage material can be obtained by ordered mesoporous carbons (carbons mesostructured from Korea, CMK-1 and CMK-3) and modified with metal/cations species. The pristine CMK-1 and CMK-3 were synthesized by replication using MCM-48 and SBA-15 as hard templates and sucrose as a carbon source. Incorporation of metal species was carried out by wetness impregnation. The mesoporous materials modified were characterized by X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), RAMAN, transmission electron microscopy (TEM), and adsorption/desorption N 2 isotherms. Carbon modified with metal/cations shows a better capacity for hydrogen uptake than that of the mesoporous carbons. The evolution of high-pressure hydrogen adsorption measured at 77 K shows that composites can significantly enhance hydrogen adsorption capacity and hydrogen storage performance of carbon materials, proving to be prospective candidates for application in hydrogen storage. The improved activity and the larger performance of composite materials are attributed to improved dispersion of uniform metal/cations nanoparticles as well as to efficient use of the support, which may originate a high-surface area and pore volume, allowing a large dispersion of clusters.

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Fabrication and characterization of ZnO@CdS core–shell nanostructure using acetate precursors: XRD, FESEM, DRS, FTIR studies and effects of cadmium ion concentration on band gap

Cited by 87 publications

References 27 publications

The Study of Structural, Physical and Electrochemical Activity of Zno Nanoparticles Synthesized by Green Natural Extracts of Sageretia Thea

The Study of Structural, Physical and Electrochemical Activity of Zno Nanoparticles Synthesized by Green Natural Extracts of Sageretia Thea

Solar Explosive Evaporation Growth of ZnO Nanostructures

Synthesis and Characterization of CMK Porous Carbons Modified with Metals Applied to Hydrogen Uptake and Storage

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