Flower-like bundles of ZnO nanosheets as an intermediate between hollow nanosphere and nanoparticles

Eftekhari, Ali; Molaei, Foroogh; Arami, Hamed

doi:10.1016/j.msea.2006.08.033

Cited by 53 publications

(20 citation statements)

References 22 publications

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“…For synthesis of nanomaterials there are various methods, such as chemical vapor deposition [21], laser ablation [22], vacuum arc deposition [23], sputtering [24] and hydrothermal process [25,26]. But most of these fabrication techniques have complex steps, which require extremely sophisticated instruments, precise experimental setup and extreme experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

Study of structural, morphological, optical and electroluminescent properties of undoped ZnO nanorods grown by a simple chemical precipitation

Singh¹,

Vishwakarma²

2015

Materials Science-Poland

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In this work, zinc oxide (ZnO) nanorods were obtained by a simple chemical precipitation method in the presence of capping agent: polyvinyl pyrrolidone (PVP) at room temperature. X-ray diffraction (XRD) result indicates that the synthesized undoped ZnO nanorods have hexagonal wurtzite structure without any impurities. It has been observed that the growth direction of the prepared ZnO nanorods is [1 0 1]. XRD analysis revealed that the nanorods have the crystallite size of 49 nm. Crystallite size is calculated by Debye-Scherrer formula and lattice strain is calculated by Williomson-Hall equation. Cell volume, Lorentz factor, Lorentz polarization factor, bond length, texture coefficient, lattice constants and dislocation density have also been studied. We also compared the interplanar spacings and relative peak intensities with their standard values at different angles. The scanning electron microscope (SEM) images confirmed the size and shape of these nanorods. It has been found that the diameter of the nanorods ranges from 1.52 µm to 1.61 µm and the length is about 4.89 µm. It has also been observed that at room temperature ultraviolet visible (UV-Vis) absorption band is around 355 nm (blue shifted as compared to the bulk). The average particle size has also been calculated by mathematical model of effective mass approximation equation, using UV-Vis absorption peak. Finally, the bandgap has been calculated using UV-absorption peak. Electroluminescence (EL) studies show that emission of light is possible at very small threshold voltage and it increases rapidly with increasing applied voltage. It is seen that smaller ZnO nanoparticles give higher electroluminescence brightness starting at lower threshold voltage. The brightness is also affected by increasing the frequency of AC signal.

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Section: Introductionmentioning

confidence: 99%

Study of structural, morphological, optical and electroluminescent properties of undoped ZnO nanorods grown by a simple chemical precipitation

Singh¹,

Vishwakarma²

2015

Materials Science-Poland

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“…This difference in growth rate together with the free energy of the systems leads to the variation in morphology of ZnO nanostructures [24].…”

Section: Crystal Structurementioning

confidence: 99%

“…To understand the detailed mechanism of antibacterial activity of ZnO nanoparticles, thorough investigations have been reported in the existing literature. Recently, it has been reported that ZnO nanoparticles also exhibit negative activity against some bacteria [19][20][21][22][23][24]. Here in this mini review article I shall discuss the chemical growth of ZnO nanostructures and their antibacterial activity.…”

Section: Introductionmentioning

confidence: 99%

Review on Wet Chemical Growth and Anti-bacterial Activity of Zinc Oxide Nanostructures

Samanta¹

2017

J Tissue Sci Eng

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Metal oxide semiconductor nanostructures are of keen interest to the researchers as they exhibit multifunctional properties compared to their bulk counterpart. Amongst several metal-oxide nanostructures zinc oxide is very popular because of its unique optoelctronic properties which are of wide importance in the field of nano-optoelectronic devices. Moreover, it also exhibit antibacterial activity which is very important in the field of medical science. This article briefly summarizes the wet chemical growth and anti-bacterial activity of several ZnO nanostructures with a view to provide the reader an overall feature of ZnO nanostructures. -Oxygen atom -Zinc atom

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“…Different metallic nano oxides show extensive utilizations in the fields such as optoelectronics Lee et al 2005) catalysis (Joshi et al 2006), sensing (Cheng et al 2004), solar cells, ultraviolet light emitter, piezoelectric device, chemical gas sensors (Eftekhari et al 2006;Kim et al (2007)) etc. Amongst all, zinc oxide nano particles have gained significant importance for both technical as well as fundamental applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature on the morphology of ZnO nanoparticles: a comparative study

Gopal¹,

Kamila²

2017

Appl Nanosci

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The present study reports the comparative analysis for the synthesis of zinc oxide nano particles by precipitation techniques using different zinc precursors. The synthesized nano particles were characterized by X-ray diffractometry (XRD), energy dispersive X-ray analysis and scanning electron microscopy (SEM) analysis for their sizes, shapes and arrangement. SEM has been studied for the samples before as well as after calcination to know the effect of temperature on structural behaviours. The XRD pattern shows the purity of synthesized zinc oxide nano particles and using Debye-Scherrer equation, the average crystal size of synthesized nanoparticles was calculated. The results have been discussed in the light of variation of morphological structures of different samples. Apart from this, the band gap energies of the synthesized particles have also been calculated from UV-visible spectrophotometric analysis, which is quite appreciable with the reported results.

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Flower-like bundles of ZnO nanosheets as an intermediate between hollow nanosphere and nanoparticles

Cited by 53 publications

References 22 publications

Study of structural, morphological, optical and electroluminescent properties of undoped ZnO nanorods grown by a simple chemical precipitation

Study of structural, morphological, optical and electroluminescent properties of undoped ZnO nanorods grown by a simple chemical precipitation

Review on Wet Chemical Growth and Anti-bacterial Activity of Zinc Oxide Nanostructures

Effect of temperature on the morphology of ZnO nanoparticles: a comparative study

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