Synthesis and characterization of nano-sized ɛ-Zn(OH)2 and its decomposed product, nano-zinc oxide

Ghotbi, Mohammad Yeganeh

doi:10.1016/j.jallcom.2009.10.214

Cited by 44 publications

(25 citation statements)

References 20 publications

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“…, which correspond to the bands observed for ε-Zn(OH) 2 [39]. The band at 477 cm À1 is due to lattice ZneO vibrations, and the two bands around 1029 and 1086 cm À1 describe asymmetric stretching vibrations of ZneOeZn bridge oxygen in the orthorhombic structure [39,40].…”

supporting

confidence: 59%

“…Upon calcination, all the bands except the one corresponding to lattice ZneO vibrations (observed around~4 30e450 cm À1 ) disappeared confirming the formation of ZnO structure [39,41].…”

mentioning

confidence: 87%

“…physically adsorbed water appears as a broad band between 3000 and 4000 cm À1 centered around 3240 cm À1 [39]. No band around 1385 cm À1 was observed indicating the absence of nitrate ion [41].…”

mentioning

confidence: 99%

“…The band at 477 cm À1 is due to lattice ZneO vibrations, and the two bands around 1029 and 1086 cm À1 describe asymmetric stretching vibrations of ZneOeZn bridge oxygen in the orthorhombic structure [39,40]. The band at 717 cm À1 can be related to d OH groups.…”

mentioning

confidence: 99%

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Zinc oxide and zinc hydroxide formation via aqueous precipitation: Effect of the preparation route and lysozyme addition

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Çetinkaya

2015

Materials Chemistry and Physics

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h i g h l i g h t s g r a p h i c a l a b s t r a c tAqueous precipitation products of Zn(NO 3 ) 2 and NaOH were prepared. Synthesis route and lysozyme addition affected morphology of the products. Aqueous precipitation products of Zn(NO 3 ) 2 and NaOH obtained by changing the method of combining the reactants and by using lysozyme as an additive were investigated. In the case of single addition method, octahedral ε-Zn(OH) 2 and plate-like b-Zn(OH) 2 structures formed in the absence and in the presence of lysozyme, respectively. Calcination of these Zn(OH) 2 samples at 700 C yielded porous ZnO structures by conserving the template crystals. When zinc source was added dropwise into NaOH solution, predominantly clover-like ZnO crystals were obtained independent of lysozyme addition. Mixed spherical and elongated ZnO morphology was observed when NaOH was added dropwise into Zn(NO 3 ) 2 solution containing lysozyme. Lysozyme contents of the precipitation products were estimated as in the range of~5e20% and FTIR indicated no significant conformational change of lysozyme in the composite. These results suggest that lysozyme-ZnO/Zn(OH) 2 composite materials may have a value as an antibacterial material.

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supporting

confidence: 59%

“…Upon calcination, all the bands except the one corresponding to lattice ZneO vibrations (observed around~4 30e450 cm À1 ) disappeared confirming the formation of ZnO structure [39,41].…”

mentioning

confidence: 87%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Zinc oxide and zinc hydroxide formation via aqueous precipitation: Effect of the preparation route and lysozyme addition

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Çetinkaya

2015

Materials Chemistry and Physics

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“…In a waterless environment (alcoholic solution) the condensation can occur, since the lack of water pushes the equilibrium state toward the product 83 After calcination and conversion to zinc oxide, the size is reported to diminish to 25 nm, calculated by Scherrer equation. Such precipitation reactions offer a good opportunity for fabrication of doped materials, as the desired dopant ions are precipitated from the same solution and are thus well mixed with the main material.…”

Section: High-temperature Methodsmentioning

confidence: 99%

Nanoparticulate inorganic UV absorbers: a review

2015

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Inorganic nanoparticles with UV-absorbing properties are an important class of UV filters. They can be used in various applications and in a variety of forms, including suspensions, nanocomposites, and solid thin films. In this review, an overview of the synthetic methods and their respective products is given for the most popular UV-absorbing nanomaterials, including zinc oxide, titanium dioxide, cerium dioxide and ferrous oxides, and oxyhydroxides.

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Overcoming Zinc Oxide Interface Instability with a Methylammonium‐Free Perovskite for High‐Performance Solar Cells

Schutt

Nayak

Ramadan

et al. 2019

Adv Funct Materials

157

125

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Perovskite solar cells have achieved the highest power conversion efficiencies on metal oxide n-type layers, including SnO 2 and TiO 2 . Despite ZnO having superior optoelectronic properties to these metal oxides, such as improved transmittance, higher conductivity, and closer conduction band alignment to methylammonium (MA)PbI 3 , ZnO is largely overlooked due to a chemical instability when in contact with metal halide perovskites, which leads to rapid decomposition of the perovskite. While surface passivation techniques have somewhat mitigated this instability, investigations as to whether all metal halide perovskites exhibit this instability with ZnO are yet to be undertaken. Experimental methods to elucidate the degradation mechanisms at ZnO-MAPbI 3 interfaces are developed. By substituting MA with formamidinium (FA) and cesium (Cs), the stability of the perovskite-ZnO interface is greatly enhanced and it is found that stability compares favorably with SnO 2 -based devices after high-intensity UV irradiation and 85 °C thermal stressing. For devices comprising FA-and Cs-based metal halide perovskite absorber layers on ZnO, a 21.1% scanned power conversion efficiency and 18% steady-state power output are achieved. This work demonstrates that ZnO appears to be as feasible an n-type charge extraction layer as SnO 2 , with many foreseeable advantages, provided that MA cations are avoided.

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Synthesis and characterization of nano-sized ɛ-Zn(OH)2 and its decomposed product, nano-zinc oxide

Cited by 44 publications

References 20 publications

Zinc oxide and zinc hydroxide formation via aqueous precipitation: Effect of the preparation route and lysozyme addition

Zinc oxide and zinc hydroxide formation via aqueous precipitation: Effect of the preparation route and lysozyme addition

Nanoparticulate inorganic UV absorbers: a review

Overcoming Zinc Oxide Interface Instability with a Methylammonium‐Free Perovskite for High‐Performance Solar Cells

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