Annealing effects on the structural and optical properties of ZnO nanoparticles with PVA and CA as chelating agents

Mallika, A. N.; Reddy, A. Ramachandra; Reddy, K. Venugopal

doi:10.1007/s40145-015-0142-4

Cited by 56 publications

(24 citation statements)

References 26 publications

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“…Figures 3 (a) and (b) depict the SEM images of ZnO nanostructure with PVA as a capping agent annealed at temperatures 400 C, respectively. With increasing annealing temperatures, the grain growth is observed in both samples as compared with the literature [24]. From micrograph, it is observed that growth of small square shape.…”

Section: Scanning Electron Microscopesupporting

confidence: 54%

Dip Coated ZnO Films for Transparent Window Applications

Meenakshi¹,

Kumar²,

Saralch³

et al. 2018

J. Nano- Electron. Phys.

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ZnO is widely used as a functional material because it has a wide and direct band gap, large excitons binding energy, and excellent chemical and thermal stability. ZnO is a semiconductor material which is widely used as transparent electrodes in solar cells, chemical and gas sensors and light emitting diodes, due to its unique electrical and optical properties. Zinc oxide (ZnO) thin films were deposited on glass substrate by dip coating technique. The effects of sol aging time on the deposition of ZnO films were studied by using the field emission scanning electron microscopy (FE-SEM) and optical transmission techniques. Thin films of ZnO were prepared on glass substrate and annealed at 300 C, 350 C and 400 C. The increase in sol aging time resulted in a gradual improvement in crystallinity. Effect of sol aging on optical transparency is quite obvious through increased transmission with prolonged sol aging time. Interestingly, 72-168 h sol aging time was found to be optimal to achieve smooth surface morphology, good crystallinity and high optical transmittance which were attributed to an ideal stability of solution. The UV-Vis transmittance spectrum of synthesized sample suggests the optical band gap value of 3.2 eV. Dip coating technique create ZnO films with potential for application as transparent electrodes in optoelectronic devices such as solar cell.

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Section: Scanning Electron Microscopesupporting

confidence: 54%

Dip Coated ZnO Films for Transparent Window Applications

Meenakshi¹,

Kumar²,

Saralch³

et al. 2018

J. Nano- Electron. Phys.

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“…In addition, regarding to the large number of defects (oxygen vacancies/ interstitials) on modified surface and effective surface area (BET) of ZnO NPs can trap bacteria and major functional groups of plasma membrane proteins in cancerous cells and also react to different types of infection diseases during diffusion process and electrostatic interactions in the reaction mechanism. These were strongly correlated to the ability of ZnO (QDs) NPs to induce reactive oxygen radicals, oxidative stress, and inflammation (Mallika et al 2015, Wahab et al 2014.…”

Section: Ftir Spectroscopy Of Two Zno (C) and Zno (A) Nanoproducts' Smentioning

confidence: 99%

Application of new ZnO nanoformulation and Ag/Fe/ZnO nanocomposites as water-based nanofluids to consider in vitro cytotoxic effects against MCF-7 breast cancer cells

Abdolmohammadi

Fallahian

Fakhroueian

et al. 2017

Artificial Cells, Nanomedicine, and Biotechnology

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Novel formulations of nanocomposites derived from ZnO nanoparticles have provided potential biomedical applications as a new strategy for treatment of breast cancer. In this research, two types of ZnO nanomaterials were synthesized by sol-gel hydrothermal process and co-precipitation containing fast quenching and also surface modification methods. The cytotoxic effects on growth of the breast cancer cell lines MCF-7 were evaluated by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay. Cell viability of the breast cancer cell line MCF-7 was reduced with increasing ZnO nanofluid concentrations at 48 and 72 h of treatment. The IC value of MCF-7 cells after 72 h of treatment with the first product ZnO (a) and second one ZnO

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“…Zinc oxide (ZnO) is a II-VI semiconductor with wide direct band gap energy (3.37 eV) at room temperature, that is suitable for short wavelength optoelectronic applications and it has a large exciton binding energy (60 meV). Due to its properties like low cost, non-toxicity, abundance in nature, suitability to doping, ZnO has got wide device applications in different areas such as ultraviolet light-emitters, gas sensors, piezoelectric transducers, and solar cells [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Mn Doping on the Structural and Optical Properties of ZnO

Bilgili¹

2019

Acta Phys. Pol. A

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Zn1−xMnxO (x = 0.00, 0.01, and 0.05, respectively) was synthesized by using solid state reaction method. The structural properties were characterized by using X-ray diffraction and scanning electron microscopy. Optical properties were investigated by UV-visible spectroscopy. X-ray diffraction patterns indicate that all samples have hexagonal wurtzite structure without any impurity phases. The diffraction intensity increases and the peak position shifts to a lower 2θ angle with Mn concentration. The lattice parameters a and c, the volume of unit cell increase with Mn content indicating that Mn 2+ ions go to Zn 2+ ions in ZnO lattice. The grain size increases with Mn doping while the microstrain and dislocation density decrease. UV-vis spectra of the samples show that undoped ZnO sample has an energy band gap Eg of 3.34 eV. The optical study indicates a red shift in the absorbance spectra and a decrease in the band gap Eg with Mn content. This decrease of band gap may be attributed to the influence of dopant ions. The morphology and grain distribution of ZnO samples were analysed by scanning electron microscopy. The particle sizes are higher in doped samples when compared to the undoped sample and the surface roughness increases with Mn content. The grains are closely, densely packed and pores/voids between the grains increase with Mn content.

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Annealing effects on the structural and optical properties of ZnO nanoparticles with PVA and CA as chelating agents

Cited by 56 publications

References 26 publications

Dip Coated ZnO Films for Transparent Window Applications

Dip Coated ZnO Films for Transparent Window Applications

Application of new ZnO nanoformulation and Ag/Fe/ZnO nanocomposites as water-based nanofluids to consider in vitro cytotoxic effects against MCF-7 breast cancer cells

The Effects of Mn Doping on the Structural and Optical Properties of ZnO

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