Structural properties and growth mechanism of flower-like ZnO structures obtained by simple solution method

Ahsanulhaq, Q.; Kim, S.H.; Kim, J.H.; Hahn, Yoon‐Bong

doi:10.1016/j.materresbull.2008.01.021

Cited by 72 publications

(38 citation statements)

References 31 publications

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“…As discussed in previous studies, the formation of Zn(OH) 2 ) 2− adsorbed on the ZnO surfaces leads to the elongation of c-axis, which actively elongates towards the 000I facet. 32,[50][51][52] This anisotropic growth leads to the formation of slender needle-like and broad arrow-like morphologies, thus giving rise to the bundles of flower-shaped ZNPs ( Figure 3E).…”

Section: Effect Of Temperature On Ph Of Znpsmentioning

confidence: 99%

Flower-shaped ZnO nanoparticles synthesized by a novel approach at near-room temperatures with antibacterial and antifungal properties

Khan¹,

Hameedullah²,

Ansari³

et al. 2014

IJN

113

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Due to enormous applications of metal oxide nanoparticles in research and health-related applications, metal oxide nanoparticles are increasingly being developed through cheaper and more user-friendly approaches. We have formulated a simple route to synthesize zinc oxide nanoparticles (ZNPs) by a sol–gel method at near-room temperatures 25°C, 35°C, 55°C, and 75°C. The results are analyzed by X-ray diffraction, scanning electron microscopy with energy-dispersive X-ray spectroscopy, and ultraviolet-visible absorption spectroscopy. The effect of different temperature conditions (25°C–75°C) on the particulate sizes (23.7–88.8 nm), pH levels (11.7–11.9), and morphologies (slender needle–broad arrow) of flower-shaped ZNP colonies is studied. A possible mechanism depicting the growth rates at different temperatures and of different facets, mainly towards the <0 0 0 I> and <0 I Ī 0> planes of the ZNPs has also been discussed. The values of λ max (293–298 nm) suggest that ZNPs prepared at 55°C are the most effective ultraviolet B absorbers, and that they can be used in sunscreens. Highly significant antimicrobial activity against medically important Gram-positive ( Staphylococcus aureus ) and Gram-negative ( Escherichia coli ) bacteria and fungi ( Candida albicans ) by these ZNPs was also revealed. As S. aureus and C. albicans are responsible for many contagious dermal infections such as abscesses, furuncles, carbuncles, cellulitis, and candidiasis, we can postulate that our fabricated ZNPs may be useful as antimicrobial agents in antiseptic creams and lotions for the treatment of skin diseases.

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Section: Effect Of Temperature On Ph Of Znpsmentioning

confidence: 99%

Flower-shaped ZnO nanoparticles synthesized by a novel approach at near-room temperatures with antibacterial and antifungal properties

Khan¹,

Hameedullah²,

Ansari³

et al. 2014

IJN

113

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show abstract

“…The driving force for the formation of these flower-like ZnO nanostructures (Figures 1a, 2a, and 2b) may be the lower surface energy at the interface between the petal-crystal assemblies, which induces various germinations, and growth into the flower-like ZnO nanostructures. 27 The ZnO NPs forming the petal assemblies were in the order of ca. 10 nm in size.…”

Section: Diffusion Of Ohmentioning

confidence: 99%

Synthesis of ZnO and ZnO2 Nanoparticles by the Oil-in-water Microemulsion Reaction Method

et al. 2012

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Crystalline ZnO and ZnO 2 nanoparticles (NPs) were prepared in one-pot oil-in-water (O/W) microemulsion media at room temperature by adding an aqueous solution of sodium hydroxide (followed by H 2 O 2 in the case of synthesis of ZnO 2 ) to the O/W microemulsion containing a Zn(II) organometallic precursor dissolved in the oil phase. After calcination of ZnO 2 NPs, ZnO NPs were also obtained, and their characteristics were compared with those of ZnO NPs prepared directly in O/W microemulsion. The materials were characterized by X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy. Nanostructured ZnO materials have attracted a lot of attention in recent years because of their optical, electrical, and chemical properties, as well as their low toxicity. These materials are n-type semiconductors with a band gap of 3.37 eV and an exciton binding energy of 60 meV; in addition, they exhibit efficient UV-stimulated emission 1 at room temperature. Nanostructured ZnO has great potential for use in a wide range of applications, for example, in phosphors, 2,3 varistors, 4a,4b gas sensors, 57 UV absorbers, 8 and antimicrobial agents, 9 and more recently, in solar cells.

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“…Considering the potential applications of copper based material, various kinds of morphologies have been reported, such as wires, monodisperse nanocubes, octahedral nanocages, hollow nanospheres, etc. [7,[18][19][20][21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Versatile synthesis of rectangular shaped nanobat-like CuO nanostructures by hydrothermal method; structural properties and growth mechanism

Dar

Ahsanulhaq

Kim

et al. 2009

Applied Surface Science

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176

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Structural properties and growth mechanism of flower-like ZnO structures obtained by simple solution method

Cited by 72 publications

References 31 publications

Flower-shaped ZnO nanoparticles synthesized by a novel approach at near-room temperatures with antibacterial and antifungal properties

Flower-shaped ZnO nanoparticles synthesized by a novel approach at near-room temperatures with antibacterial and antifungal properties

Synthesis of ZnO and ZnO2 Nanoparticles by the Oil-in-water Microemulsion Reaction Method

Versatile synthesis of rectangular shaped nanobat-like CuO nanostructures by hydrothermal method; structural properties and growth mechanism

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