Hydrothermalsynthese von Zinkit

Rykl, D.; Bauer, J.

doi:10.1002/crat.19680030305

Cited by 22 publications

(8 citation statements)

References 5 publications

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“…These applications require structured ZnO and ZnO films in which the c axis of the ZnO unit cell is perpendicular to the substrate/contact layer. Rykl et al reported a preparation method of thin-plate-structured ZnO. However, to prepare thin-plate-structured ZnO requires severe preparation conditions such as an autoclave with NH 4 Cl at 723 K, 600 atm.…”

Section: Resultsmentioning

confidence: 99%

Effects of Zinc on the New Preparation Method of Hydroxy Double Salts

et al. 1999

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In this study, a new preparation method of hydroxy double salts (HDSs) including organic compounds between layers has been established in which the HDSs were prepared by reacting ZnO with organic metal salts in water. This method does not need an anion-exchange reaction to incorporate organic compounds into the HDS layers. Moreover, the reaction proceeds under mild conditions around room temperature, and the obtained HDSs showed high crystallinity compared to those obtained by an anion-exchange reaction. We prepared ZnO crystals having a thin-plate structure by the thermal treatment of hydroxy zinc acetate at 873 K.

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Section: Resultsmentioning

confidence: 99%

Effects of Zinc on the New Preparation Method of Hydroxy Double Salts

et al. 1999

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“…This crystal structure also was detected by a few researchers. Rykl et al 49 rst obtained this ZnO phase under the condition of high temperature (450 C) and high pressure (600 bar). Yue Zhao et al 50 reported this ZnO phase in heavy N-dopped (10%) ZnO lm.…”

Section: Effect Of Reaction Time On Phase and Morphologymentioning

confidence: 99%

Time-dependent control of phase and morphology transformation of porous ZnO hollow microspheres by a facile one-step solution route

Fang

Zhang

et al. 2014

RSC Adv.

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Porous ZnO hollow microspheres with a ZnO crystalline phase of PDF # 21-1486 have been prepared by a simple one-step solution route using the trisodium citrate as a shape-directing agent. FESEM, FT-IR, TEM and XRD were used to characterize the samples. Series of experiments showed the reaction time has a prominent impact on the phase and morphology transformation. At a point of the controlling growth time, porous ZnO hollow microspheres with average diameter of 2-3 mm and hole-opening diameter of $0.5 mm were obtained which exhibited a high surface area (117.36 m 2 g À1 ) and a large pore volume (0.50 cm 3 g À1 ). On the basis of experiment results, a possible growth mechanism of as-synthesized porous ZnO hollow microspheres was concluded to be a two-step process: the zinc citrate complexion was preferentially formed, and then the dissolution of zinc citrate complexion and the formation of ZnO crystal occurred simultaneously, which associated with the special role of the citrate anion on oriented growth.

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“…That ZnO phase has also been marginally reported by other authors: in N doped thin films 22 , in porous hollow microspheres 23 and oxidation of Langmuir-Blodgett multilayers 24 . This phase was obtained by Rykl and Bauer at high temperatures (450 °C) and high pressures (600 atm) 21 . The high growth temperature and/or stress induced by doping have been probably the cause of the crystalline change in the aforementioned reports.…”

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confidence: 98%

Modification of the Crystalline Structure of ZnO Nanoparticles Embedded Within a SiO2 Matrix due to Thermal Stress Effects

et al. 2019

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Self-assembled nanocrystals of ZnO were embedded within a SiO 2 matrix by a sequential deposit using reactive R.F. sputtering. The ZnO nanoparticles (NP's) were obtained by depositing a very thin layer (~20 nm) of Zn on the bottom of the valleys of a first SiO 2 rough surface and then covered by another SiO 2 layer at 500 °C. The stress produced, due to the cooling process, by the SiO 2 matrix on the ZnO NP's generates an unusual crystalline phase of ZnO. The crystal structure was determined by means of X ray diffraction patterns. The ZnO + SiO 2 composite shows a transmittance higher than 80 % for wavelengths > 450 nm. Optical absorption allows to reveal the character and value of the optical band gap. Vibrational modes of the material were determined by Raman spectroscopy.

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Hydrothermalsynthese von Zinkit

Cited by 22 publications

References 5 publications

Effects of Zinc on the New Preparation Method of Hydroxy Double Salts

Effects of Zinc on the New Preparation Method of Hydroxy Double Salts

Time-dependent control of phase and morphology transformation of porous ZnO hollow microspheres by a facile one-step solution route

Modification of the Crystalline Structure of ZnO Nanoparticles Embedded Within a SiO2 Matrix due to Thermal Stress Effects

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