High yield synthesis and characterization of aqueous stable zinc oxide nanocrystals using various precursors

Swati, G.; Mishra, Saroj Kumar; Yadav, Deepika; Sharma, Ritu; Dwivedi, Dileep; Vijayan, N.; Tawale, J.S.; Shanker, Virendra; Haranath, D.

doi:10.1016/j.jallcom.2013.03.218

Cited by 10 publications

(2 citation statements)

References 29 publications

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“…Because of their hexagonal appearance, these islands (small square shape) can be explained as ZnO crystal seeds [20]. This result suggests that the seeding layer and seeding crystals were made of unsymmetrically oriented ZnO crystals, which was also confirmed by XRD analysis [21,22].…”

Section: Fe-sem and Cross Section Imagesmentioning

confidence: 56%

Physical Properties of the Nano-Crystaline Spin-Coated Zinc Oxide Thin Film

Khanali,

Nekouee

2024

Preprint

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In this study, Zinc oxide thin films have been synthesized using dehydration from various precursors. In ethanol and mono-ethanolamine, zinc acetate (I) and zinc nitrate (II) were dissolved. Following that, glass substrates were coated with this solution using the sol-gel spin coating method (3000 rpm for 10 s), and for making zinc oxide thin films were heated at 250°C. This process was done five times to make the films thicker (and allow them to form five layers on the substrate), and then they were annealed at 450°C. zinc oxide thin films derived from zinc acetates (I) are almost transparent in visible light in comparison zinc nitrates (II) product. The highest energy gap (3.3ev) and crystal size (74nm) were also achieved in zinc acetates (I) products. The presence of various vibration modes in the prepared samples was also revealed by Raman spectroscopy (RS) of the annealed films. The presence of concentrated stresses within the coated films is also determined using RS, and verify the scanning electron microscopy results the Raman peaks of E2 is confirmed by FE-SEM images.

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Section: Fe-sem and Cross Section Imagesmentioning

confidence: 56%

Physical Properties of the Nano-Crystaline Spin-Coated Zinc Oxide Thin Film

Khanali,

Nekouee

2024

Preprint

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“…The HAZn5 and HAZn10 samples showed a sharp peak characteristic of the hexagonal structure of zinc oxide reported in standard JCPDS card no. 89‐1397) .…”

Section: Resultsmentioning

confidence: 99%

Fabrication of zinc-loaded hollow glass microspheres (HGMs) for hydrogen storage

Dalai

Vijayalakshmi

Shrivastava

et al. 2015

Int. J. Energy Res.

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The greatest challenge for a feasible hydrogen economy lies on the production of pure hydrogen and the materials for its storage with controlled release at ambient conditions. Hydrogen with its great abundance, high energy density and clean exhaust is a promising candidate to meet the current global challenges of fossil fuel depletion and green house gases emissions. Extensive research on hollow glass microspheres (HGMs) for hydrogen storage is being carried out world-wide, but the right material for hydrogen storage is yet underway. But many other characteristics, such as the poor thermal conductivity etc. of the HGMs, restrict the hydrogen storage capacity. In this work, we have attempted to increase the thermal conductivity of HGMs by ZnO doping. The HGMs with Zn weight percentage from 0 to 10 were prepared by flame spheroidization of amber-colored glass powder impregnated with the required amount of zinc acetate. The prepared HGMs samples were characterized using field emission-scanning electron microscope (FE-SEM), environmental SEM (ESEM), high-resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy and X-ray diffraction (XRD) techniques. The deposition of ZnO on the microsphere walls was observed using FE-SEM, ESEM and HRTEM which was further confirmed using the XRD and ultraviolet-visible absorption data. The hydrogen storage studies done on these samples at 200°C and 10-bar pressure for 5 h showed that the hydrogen storage increased when the Zn percentage in the sample increased from 0 to 2%. The percentage of zinc beyond 2, in the microspheres, showed a decline in the hydrogen storage capacity. The closure of the nanopores due to the ZnO nanocrystal deposition on the microsphere surface reduced the hydrogen storage capacity. The hydrogen storage capacity of HAZn2 was found 3.26 wt% for 10-bar pressure at 200°C.

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