Morphology change of self-assembled ZnO 3D nanostructures with different pH in the simple hydrothermal process

Jang, Jae-Min; Kim, Sung-Dai; Choi, Hee-Man; Kim, Jin‐Yeol; Jung, Woo-Gwang

doi:10.1016/j.matchemphys.2008.07.108

Cited by 50 publications

(12 citation statements)

References 21 publications

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“…The samples were prepared at Zinc Acetate (ZnAc) and NaOH molar ratios of 1:3 and 1:9 for a fixed molar content of surfactants CTAB and PVP to study the effects of surfactant and NaOH concentration on the morphology and photocatalytic behaviors of the fabricated nanostructures. As the growth rate of ZnO nanostructures and their morphology are known to be driven by the surface energy of their crystal facets or planes, which generally get modified by surfactants apart from the pH of the reaction (Xie et al, 2009;Jang et al, 2009), we used CTAB and PVP as ionic (cationic) and non-ionic surfactants, respectively, to observe the effect of surfactant nature on morphology evolution of ZnO nanostructures.…”

Section: Preparation Of Zno Nanostructures Using Ctab and Pvpmentioning

confidence: 99%

Large Scale Synthesis of ZnO Nanostructures of Different Morphologies through Solvent-free Mechanochemical Synthesis and their Application in Photocatalytic Dye Degradation

Zeferino¹,

Ramón²,

Reyes³

et al. 2016

American Journal of Engineering and Applied Sciences

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Well crystalline, near-stoichiometric zinc oxide nanostructures of different morphologies are fabricated in large scale, utilizing a simple, cost effective mechanochemical synthesis in absence of solvent. Effects of ionic and nonionic surfactants along with the concentration of hydrolyzing agent on the evolution of nanostructure morphology have been studied. It has been observed that while a cationic surfactant such as Cetyltrimethylammonium Bromide (CTAB) favors the nanostructures to growth along their polar c-axis, a nonionic surfactant such as Polyvinylpyrrolidone (PVP) reduces their preferred c-axis growth. Increase of hydrolyzing agent in the reaction mixture enhances the growth rate of the nanostructures. The nanostructures have been tested for photodegradation of anionic dye molecules such as Methylene Blue (MB). All the nanostructures manifest high photocatalytic performance. Apart from morphology, the specific surface area, crystal plane orientation and the concentration of basic sites at surface are seen to contribute significantly to the photocatalytic performance of the zinc oxide nanostructures.

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Section: Preparation Of Zno Nanostructures Using Ctab and Pvpmentioning

confidence: 99%

Large Scale Synthesis of ZnO Nanostructures of Different Morphologies through Solvent-free Mechanochemical Synthesis and their Application in Photocatalytic Dye Degradation

Zeferino¹,

Ramón²,

Reyes³

et al. 2016

American Journal of Engineering and Applied Sciences

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“…OHions are required for the ZnO conversion, as it allows nucleation, growth and particle formation, pH 6 and 7 lacks OHions. With the increase in pH, agglomeration rate decreases and particle size becomes smaller due to the alkaline condition 28 . Other researchers have also reported that the concentration of reducing agent, metal salt, pH, temperature plays an important role in synthesis [29][30][31] .…”

Section: Resultsmentioning

confidence: 99%

Exposure of biosynthesized nanoscale ZnO to Brassica juncea crop plant: morphological, biochemical and molecular aspects

Mazumder

Khan

Perwez

et al. 2020

Sci Rep

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the present work describes the in vitro synthesis and characterization of Zinc oxide nanoparticles (Zno NPs) using an enzyme alpha amylase, the synthesized nanoparticles were used to study their beneficial effect in the growth and development of Brassica juncea. transmission electron Microscope (teM) image reveals the average size of ZnO NPs was 11 nm and X-ray powder diffraction (XRD) suggests nanoparticles were crystalline in nature. In-silico study confirmed lysine, glutamine and tyrosine present in alpha amylase enzyme, plays a crucial role in the reduction of Zinc acetate dihydrate to Zno NPs. The biochemical parameters and oxidative enzymes of Brassica juncea were compared with Zno NPs treated plants. The effect of ZnO NPs on the cellular expression of metal tolerant protein (BjMTP) and cation efflux transporter gene (BjCET2) was also studied. the results indicate that nanoparticles can be used as a replacement for traditional harmful chemical fertilizers.

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“…As the complexes formed with the oxidized ZnO, the Zn ions are released, and black ZnO tannate is precipitated. Therefore, at pH lower than 3 where no complexes were formed, it is believed that abundance of ZnO had been adjusted to pH to 6 and 7 as explained elsewhere [ 35 , 36 , 37 ] but not included in the present work.…”

Section: Resultsmentioning

confidence: 99%

pH-Dependent Formation of Oriented Zinc Oxide Nanostructures in the Presence of Tannic Acid

2020

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To crucially comprehend the relaying factors behind the growth mechanism of ZnO nanostructures, the needs to understand the cause of preferences in the enhancement of desired physicochemical properties are essential. The particular oriented attachment (OA) is believed to become the cause of the classical growth pattern of ZnO nanostructures which is mainly controlled by the Ostwald ripening (OR) process. In the present work, the concerns over the systematic changes in size and the morphological surface of ZnO nanostructures upon exposure to tannic acid (TA) prepared by drop-wise method turns the particles to different surface adjustment state. Here, we assessed the TA capping ability and its tendency to influence the OA process of the ZnO nanostructures. The detailed process of the growth-based TA system via transmission electron microscopy (TEM), scanning electron microscopy (SEM), and FFT autocorrelation revealed the pH effect on their physical properties which proved the transition surface properties state of the particles from rough to smooth states due to oriented attachment. For pure ZnO nanostructures, the surface is almost smooth owing to the strong bonding particles which are then changed to coarsened surface structures upon the introduction of TA. Strong surface adsorption of Zn cations and phenol ligands mediated the agglomerated nanocrystals, surprisingly with smaller nanostructures dimension.

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Morphology change of self-assembled ZnO 3D nanostructures with different pH in the simple hydrothermal process

Cited by 50 publications

References 21 publications

Large Scale Synthesis of ZnO Nanostructures of Different Morphologies through Solvent-free Mechanochemical Synthesis and their Application in Photocatalytic Dye Degradation

Large Scale Synthesis of ZnO Nanostructures of Different Morphologies through Solvent-free Mechanochemical Synthesis and their Application in Photocatalytic Dye Degradation

Exposure of biosynthesized nanoscale ZnO to Brassica juncea crop plant: morphological, biochemical and molecular aspects

pH-Dependent Formation of Oriented Zinc Oxide Nanostructures in the Presence of Tannic Acid

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