Thermal annealing induced structural and optical properties of Ca doped ZnO nanoparticles

Udayabhaskar, R.; Mangalaraja, Ramalinga Viswanathan; Karthikeyan, B.

doi:10.1007/s10854-013-1225-z

Cited by 20 publications

(13 citation statements)

References 25 publications

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“…The effect of calcination temperature was reflected by a change in color of the synthesized sample. It was white before calcination, and turned yellow at 600 °C calcination temperature, light yellow at 700 °C, and white at 800 °C, which agree with the result obtained by Udayabhaskar et al…”

Section: Results and Discussionsupporting

confidence: 92%

“…Using UV light clearly plays was s a dominant factor on the formation of nano rods and nano spherical particles which was observed at lower concentrations, The effect of the calcination temperature was seen in the colour of the synthesized sample as it was white before calcination and it changed to yellow after it was exposed to 600 C calcination temperature and slightly yellow at 700 C to white at 800 C which confirm the result obtained and by 27 .…”

Section: Characterization Of the Catalystsupporting

confidence: 82%

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Efficient Biodiesel Production from Algae Oil Using Ca-Doped ZnO Nanocatalyst

Abdala

Nur

Mustafa

2020

Ind. Eng. Chem. Res.

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Biodiesel is a sustainable alternative to petroleum diesel produced by trans-esterification of vegetable oils in a presence of a catalyst. The present study investigates heterogeneous transesterification of algal oil to biodiesel using novel calcium doped zinc oxide nanocatalysts synthesized using UV shaker. The developed catalyst was under different light sources UV and non UV, different calcium concentrations (0.01, 0.03, 0.05 M) and different calcination temperature (600,700,800°C). The catalyst has been characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier Transform Infrared spectroscopy (FT-IR), Energy Dispersive Spectra (EDS). The effects of the different parameters used in catalyst preparation were studied for transesterification of algal oil. The catalyst of 0.05M calcium loading, calcination temperature 700 °C, synthesized in UV light is considered as the most suitable nanocatalyst which achieved 99.18% yield of biodiesel. The catalyst was used three times effectively with 76% yield. The chemical properties of biodiesel have been investigated using Gas Chromatography

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Section: Results and Discussionsupporting

confidence: 92%

Section: Characterization Of the Catalystsupporting

confidence: 82%

Efficient Biodiesel Production from Algae Oil Using Ca-Doped ZnO Nanocatalyst

Abdala

Nur

Mustafa

2020

Ind. Eng. Chem. Res.

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“…Water and Yang have reported the deposition of Ca doped ZnO thin films by RF sputtering and studied their sensor applications. Mishra et al found that there is an increase in band width with increase in Ca concentration in ZnO [7]. A number of methods have been devoted for the fabrication of doped ZnO nanoparticles, such as autocombustion method, ball-milling, solid state reaction, coprecipitation, sol-gel process, hydrothermal route, and so on [3].…”

Section: Introductionmentioning

confidence: 99%

Temperature and Frequency Dependence Electrical Properties of Zn_1-xCa_xO Nanoceramic

Das

Parashar

et al. 2016

Acta Phys. Pol. A

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This work reports the temperature and frequency dependence electrical properties of Ca doped ZnO (Zn1−xCaxO, x = 0.01) nanoceramic synthesized by solid state reaction method. The X-ray spectra show that the synthesized powder has hexagonal wurtzite structure with space group P 63mc. The average crystallite size decreases with Ca doping. The increase in oxygen positional parameter (u) indicates lattice distortion in the crystal structure. Doping with Ca caused a slight shift in the (101) plane peak towards lower diffraction angle. The formation of pores in field emission scanning electron microscopy micrograph may be due to the defect created by Ca substitution. The electrical property was investigated by impedance spectroscopy in the temperature range 300-500• C. The synthesized sample shows temperature dependence relaxation phenomena and negative temperature coefficient of resistance effects. Electrical conductivity (σac) increases with increase in temperature as well as with frequency due to the drift mobility of electrons and hole by hopping conduction. Dielectric constant was found to decrease with increase in frequency and temperature. This decreases drastically in the magnitude of approximately < 10 times than the corresponding undoped one.

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“…2B1 are the silent phonons [39] while the other modes are the Raman active phonons [40] verified in the range 900-1200 cm -1 [41], which is presented by several bands in Fig. The toxicity of ZnO NPs on physiological parameters of Helix aspersa is determined following several concentrations in the range 100-10000 μg/g.…”

Section: Xrd Pattern Of Znomentioning

confidence: 99%

Chemical Route Manufactured ZnO Nanoparticles and Their Biological Accumulation

Bouloudenine

Laala-Bouali

Djeddou

et al. 2022

J Inorg Organomet Polym

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ZnO nanocrystalline powder was successfully synthesized via coprecipitation method coupled with high annealing treatment. X-ray diffraction analysis revealed that the NPs have a pure hexagonal wurtzite structure with a mean crystallite size of approximately 59 nm. FESEM observations along with EDS analysis indicated the formation of fine particles in the nanoscale regime, with hexagonal shape and high purity. Both Raman and photoluminescence characterizations confirmed the high crystalline and the optical quality of the synthesized ZnO NPs. The assessment of the impact of ZnO-based nanoparticles and their effects on body and bioaccumulative bioindicators of pollution, Helix aspersa snails was performed in order to preserve the safe development of nanotechnology.

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Thermal annealing induced structural and optical properties of Ca doped ZnO nanoparticles

Cited by 20 publications

References 25 publications

Efficient Biodiesel Production from Algae Oil Using Ca-Doped ZnO Nanocatalyst

Efficient Biodiesel Production from Algae Oil Using Ca-Doped ZnO Nanocatalyst

Temperature and Frequency Dependence Electrical Properties of Zn_1-xCa_xO Nanoceramic

Chemical Route Manufactured ZnO Nanoparticles and Their Biological Accumulation

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Thermal annealing induced structural and optical properties of Ca doped ZnO nanoparticles

Cited by 20 publications

References 25 publications

Efficient Biodiesel Production from Algae Oil Using Ca-Doped ZnO Nanocatalyst

Efficient Biodiesel Production from Algae Oil Using Ca-Doped ZnO Nanocatalyst

Temperature and Frequency Dependence Electrical Properties of Zn1-xCaxO Nanoceramic

Chemical Route Manufactured ZnO Nanoparticles and Their Biological Accumulation

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Temperature and Frequency Dependence Electrical Properties of Zn_1-xCa_xO Nanoceramic