Synthesis and assembly of zinc hydroxide sulfate large flakes: Application in gas sensor based on a novel surface mount technology

Xue, Lihong; Mei, Xintao; Zhang, Wuxing; Yuan, Lixia; Hu, Xianluo; Huang, Yunhui; Yanagisawa, Kazumichi

doi:10.1016/j.snb.2010.03.016

Cited by 18 publications

(8 citation statements)

References 30 publications

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“…These interesting morphologies may offer different application areas. For example, 3D interconnected ZnO nanoparticles obtained after the calcination of 2D flake-like structures showed promising gas-sensing applications [37,38]. Hence, calcined samples prepared with the aid of lysozyme via single addition method with similar porous sheet-like morphology may have a value in this field.…”

Section: Resultsmentioning

confidence: 99%

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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Section: Resultsmentioning

confidence: 99%

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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“…Some previous reports have mistakenly identify ZHS (in its various hydration states) as ZnO 37,38 and none have made the connection to dislocation-driven growth. 17,33,37,38 Interestingly, many metal hydroxides/oxides have been reported to readily form similar nanoplate morphologies 16,19À21,47,48 with the most similar being the zinc hydroxy chlorides. 49À52 The layers in ZHS are always perpendicular to the c-direction and consist of planes of hexagonally arranged octahedrally coordinated zinc cations bridged by water and sulfate anions (Figure 2B left).…”

Section: Nano Lettersmentioning

confidence: 99%

“…15,21 Here we first discuss the low-temperature aqueous synthesis and the dislocation-driven growth of nanoplates of zinc hydroxy sulfate (ZHS, 3Zn(OH) 2 3 ZnSO 4 3 mH 2 O), 31,32 a layered hydroxide related to ZnO. Even though ZHS nanoplates in various states of hydration have been observed to form under aqueous hydrolytic conditions, 17,33,34 the critical role of dislocations in their growth has not been appreciated or revealed. While there are reports of the direct growth of ZnO nanoplates, 25,35,36 there are some examples where nanoplates of ZHS have been incorrectly reported as ZnO, 37,38 a material with numerous applications in photonics, 39 solar, 40 and piezoelectronic 41 energy conversion.…”

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confidence: 99%

“…All minor peaks can be indexed to zinc hydroxide or the pentahydrate form of ZHS where m = 5. Some previous reports have mistakenly identify ZHS (in its various hydration states) as ZnO , and none have made the connection to dislocation-driven growth. ,,, Interestingly, many metal hydroxides/oxides have been reported to readily form similar nanoplate morphologies ,− ,, with the most similar being the zinc hydroxy chlorides. − The layers in ZHS are always perpendicular to the c -direction and consist of planes of hexagonally arranged octahedrally coordinated zinc cations bridged by water and sulfate anions (Figure B left). While the separation between zinc layers increases with the degree of hydration, the hexagonal geometry of the zinc cations always remains the same. , Furthermore, ZHS have triclinic crystal structures with unit cell parameters that are very close to a hexagonal cell (Supporting Information Table S1). , In particular, the hemihydrate unit cell ( a = 8.356 Å, b = 8.356 Å, and c = 7.084 Å and α = 90°, β = 90°, and γ = 120°) is pseudohexagonal .…”

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confidence: 99%

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Screw Dislocation-Driven Growth of Two-Dimensional Nanoplates

et al. 2011

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We report the dislocation-driven growth of two-dimensional (2D) nanoplates. They are another type of dislocation-driven nanostructure and could find application in energy storage, catalysis, and nanoelectronics. We first focus on nanoplates of zinc hydroxy sulfate (3Zn(OH)(2)·ZnSO(4)·0.5H(2)O) synthesized from aqueous solutions. Both powder X-ray and electron diffraction confirm the zinc hydroxy sulfate (ZHS) crystal structure as well as their conversion to zinc oxide (ZnO). Scanning electron, atomic force, and transmission electron microscopy reveal the presence of screw dislocations in the ZHS nanoplates. We further demonstrate the generality of this mechanism through the growth of 2D nanoplates of α-Co(OH)(2), Ni(OH)(2), and gold that can also follow the dislocation-driven growth mechanism. Finally, we propose a unified scheme general to any crystalline material that explains the growth of nanoplates as well as different dislocation-driven nanomaterial morphologies previously observed through consideration of the relative crystal growth step velocities at the dislocation core versus the outer edges of the growth spiral under various supersaturations.

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“…Studies of Zn 4 (OH) 6 SO 4 •zH 2 O (also written as [Zn(OH) 2 ] 3 • ZnSO 4 •zH 2 O) showed that z can be 0, 1/2, 1, 3, 4 and 5. [1][2][3][4][5][6][7][8][9] These compounds have applications in fertilizers (as a source of zinc) 6,10,11 and as pigments. 12 The basic zinc sulphates could also serve as a precursor from which to make zinc oxide (ZnO), a material with considerable industrial importance.…”

Section: Introductionmentioning

confidence: 99%

Zinc hydroxide sulphate and its transformation to crystalline zinc oxide

2013

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The thermal transformation of zinc hydroxide sulphate hydrate to zinc oxide has been examined using synchrotron X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, and surface area measurements. By collecting X-ray diffraction data in situ, we found that the dehydration of zinc hydroxide sulphate pentahydrate proceeded in discrete steps to form anhydrous zinc hydroxide sulphate. This compound then decomposed to a mixture of zinc oxide and a compound tentatively identified as Zn3(OH)2(SO4)2 at ~235 °C. At ~360 °C, the final dehydroxylation occurred with the formation of zinc oxy-sulphate, Zn3O(SO4)2, which then decomposed to ZnO at about ~800 °C. Interruption of the dehydration process can be used to synthesize the intermediate compounds.

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Synthesis and assembly of zinc hydroxide sulfate large flakes: Application in gas sensor based on a novel surface mount technology

Cited by 18 publications

References 30 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

Screw Dislocation-Driven Growth of Two-Dimensional Nanoplates

Zinc hydroxide sulphate and its transformation to crystalline zinc oxide

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