Structural and optical properties of ZnO nanoparticles prepared by direct precipitation method

Kahouli, Majdi; Barhoumi, A.; Bouzid, Anis; Al‐Hajry, A.; Guermazi, S.

doi:10.1016/j.spmi.2015.05.007

Cited by 230 publications

(90 citation statements)

References 46 publications

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“…The relation between the refractive index n and the wavelength λ is described by the Cauchy law [27]:…”

Section: Refractive Index and Extinction Coefficientmentioning

confidence: 99%

“…The values of n o , A, and B for three samples are given in Table 4. The dispersion in refractive index of La 2 O 3 NPs can be fitted into the single oscillator model proposed by Wemple and Didomenico [27] which has been found to fit the behavior of a number of ionic and covalent compounds [28]. The spectral dependence of the refractive index according to this model is then defined by the equation:…”

Section: Refractive Index and Extinction Coefficientmentioning

confidence: 99%

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Influence of preparation methods of microwave, sol–gel, and hydrothermal on structural and optical properties of lanthania nanoparticles

2015

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applications involve a metal oxide as active phase, promoter, or support. In the chemical and petrochemical industries, products worth billions of dollars are generated every year through processes that use metal or metal oxide catalysts [2]. For the control of environmental pollution, catalysts or sorbents that contain metal oxides are employed to remove CO, NO x , and SO x species formed during the combustion of fossil fuels [3]. The most active areas of the semiconductor industry involve the use of metal oxides [4]. Thus, most of the chips used in computers contain a metal oxide component.When the size of a metal oxide is brought down to the nanometer regime, a number of size-dependent properties arise primarily as a result of surface chemistry [5][6][7]. Metal oxide nanoparticles (NPs) can exhibit unique physical and chemical properties due to their limited size. Particle size is expected to influence three important groups of basic properties in any material. The first one comprises the structural characteristics, namely the lattice symmetry and unit cell parameters [8]. Bulk metal oxides are usually stable systems with well-defined crystallographic structures. With decreasing particle size, thermodynamic stability and cell parameters change and structural transformations may occur [6]. The second important influence of size is related to the electronic properties. With decreasing particle size, the energy of exciton levels of a semiconductor metal oxide shifts and hence the optical band gap changes [7,9]. Structural and electronic properties obviously change the physical and chemical properties of a solid which are the third group of properties influenced by size in a simple classification [6,10].Lanthanum (III) oxide, La 2 O 3 , has the largest band gap of the rare earth oxides (4.3 eV), the lowest lattice energy, and a very high dielectric constant. These properties lead to potential applications such as dielectric layers in devices, Abstract In this work, the nearly pure hexagonal phase of lanthania nanoparticles (NPs) was successfully synthesized using three methods: microwave, sol-gel, and hydrothermal. The samples were characterized using nine techniques including powder X-ray powder diffraction, thermogravimetry, transmission electron microscopy, scanning electron microscopy, field emission microscopy, energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, far infrared spectroscopy, and ultraviolet-visible absorption spectroscopy. This study showed that the method of synthesizing lanthania NPs can affect the size, which in turn has impact on structural, morphological, and optical properties.

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“…The relation between the refractive index n and the wavelength λ is described by the Cauchy law [27]:…”

Section: Refractive Index and Extinction Coefficientmentioning

confidence: 99%

Section: Refractive Index and Extinction Coefficientmentioning

confidence: 99%

Influence of preparation methods of microwave, sol–gel, and hydrothermal on structural and optical properties of lanthania nanoparticles

2015

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“…In the present work, wet chemical coprecipitation method [2,4,17,20,21] has been opted for the synthesis of ZnO samples and their optical properties were studied at different NaOH concentrations. High purity ZnO nanospheres with decreasing diameter were obtained as the NaOH concentration increased.…”

Section: Introductionmentioning

confidence: 99%

Effect of NaOH concentration on optical properties of zinc oxide nanoparticles

Koutu

Shastri

Malik

2016

Materials Science-Poland

102

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In the present work, powder zinc oxide samples were prepared by varying NaOH concentration (0.1 M -0.4 M) using wet-chemical co-precipitation method. As-synthesized ZnO was characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), photoluminescence (PL) and Raman spectroscopy. Formation of hexagonal wurtzite structure of the ZnO samples has been revealed from XRD studies. This study further suggests reduction in crystallite size from 40 nm to 23 nm with an increase in NaOH concentration which is confirmed by FESEM. PL and Raman spectroscopy studies of these samples show significant peak shift towards the higher and lower energy respectively, with maximum PL emission between 400 nm and 470 nm region of the visible spectrum. Noticeable inverse relationship between optical properties of ZnO nanoparticles and NaOH concentration may be attributed to the rapid nucleation during the synthesis process. With these remarkable properties, ZnO nanoparticles may find applications in nanoelectronic devices, sensors, nanomedicine, GATE dielectrics, photovoltaic devices, etc.

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“…The thermaldynamic rearrangement has three possible stabilization mechanisms: surface reconstruction, surface electron transferring, and surface nonstoichiometry. The surface reconstruction is the one that is most likely to happen for reducing the surface energy [9][10][11][12][13][14]. The surface reconstruction method may reduce the surface energy of crystals and thereby increase the uniaxial growth capacity by decreasing the surface area of the polar plane.…”

Section: Resultsmentioning

confidence: 99%

Synthesis High Sensivity ZnO Cholesterol Biosensor with One Dimensional Nanostructures

Jhuang

Tang

et al. 2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Chelosterol ZnO biosensors were synthesized by hydrothermal method with predeposited ALD-ZnO seed layers. The ZnO nanostructures were examined by SEM, XRD, AFM, respectively. The XRD is used to analyze the crystal structures of ZnO seed layers that were grown by ALD process, then using SEM and AFM to analysis the surface morphologies of them. Growing of one dimensional ZnO nanostructures on seed layer of 10nm thickness, reveals high sensitivity of 3.15 uA (mg/dl) -1 cm -2 (121.96 uAmM -1 cm -2 ) and low K m value of 0.29mM in 25-100mg/dl cholesterol concentration range. The response time could be as low as 10seconds. In the study, it is found that increasing the aspect ratio of ZnO one dimensional nanostructure also increases the sensitivity and expends the linear measureable range of detecting cholesterol in solution. The thickness of seed layer has a significant influence on sensitivity for one dimensional nano ZnO cholesterol biosensor.

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Structural and optical properties of ZnO nanoparticles prepared by direct precipitation method

Cited by 230 publications

References 46 publications

Influence of preparation methods of microwave, sol–gel, and hydrothermal on structural and optical properties of lanthania nanoparticles

Influence of preparation methods of microwave, sol–gel, and hydrothermal on structural and optical properties of lanthania nanoparticles

Effect of NaOH concentration on optical properties of zinc oxide nanoparticles

Synthesis High Sensivity ZnO Cholesterol Biosensor with One Dimensional Nanostructures

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