Novel sol-gel synthesis of cerium-doped ZnO thin films for photocatalytic activity

Senthilvelan, S.; Chandraboss, V. L.; Karthikeyan, B.; Murugavelu, M.; Loganathan, B.; Natanapatham, L.

doi:10.1063/1.4736928

Cited by 7 publications

(2 citation statements)

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“…30,31 The studies concerning the effect of metal (M = Ce, Al, Cr) doped ZnO for photocatalysis is very scarce. Ce-doped ZnO 32 and Al-doped ZnO 33 showed enhanced photocatalytic activity as compared with pure ZnO, due to the increase in oxygen vacancies and surface area, respectively, as dopants increase. However, the enhanced photocatalytic activity of Cr-doped ZnO 34 has been explained by its enhanced visible light absorption ability.…”

Section: ■ Introductionmentioning

confidence: 99%

Effects of Morphology and Zr Doping on Structural, Optical, and Photocatalytic Properties of ZnO Nanostructures

Selvam

Vijaya

Kennedy

2012

Ind. Eng. Chem. Res.

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ZnO nanomaterials with different morphologies such as nanoflakes, spherical nanoparticles (SNPs), and nanorods have been synthesized via a simple low temperature coprecipitation method. The concentration of the capping agent is a key factor in the morphological control of ZnO nanostructures. Triton X-100 micelles were found to be single molecules at low concentration but spherical and rod-like shaped micellar aggregation at higher concentrations. The formation of different morphologies of ZnO was confirmed by HR-SEM and HR-TEM. XRD data showed the formation of single-phase ZnO with the wurtzite crystal structure. The influence of Zr contents on the structure, morphology, absorption, emission, and photocatalytic activity of ZnO SNPs was investigated systematically. The influence of the ZnO morphologies on the photocatalytic degradation (PCD) of resorcinol as a model reaction is evaluated and discussed in terms of particle size, surface area, crystal growth habits, and oxygen defects. The results indicated that the particle size is an important factor for the PCD, and thus, the 1.5 wt % Zrdoped ZnO SNPs show superior performance toward PCD of resorcinol than other samples due to the small particle size distribution. Furthermore, the effect of different photocatalytic reaction parameters on the resulting PCD efficiency of ZnO SNPs was investigated. ■ INTRODUCTIONThe shape control of semiconductor nanostructures has attracted considerable attention due to the fact that they play very important roles in determining their physical and chemical properties. 1−4 Nanostrucutured zinc oxide (ZnO) is a versatile and interesting semiconductor material to study because it possesses very attractive physical properties such as a wide direct band gap (3.37 eV), a large exciton binding energy of 60 meV at room temperature, and unique electronic, catalytic, optoelectronic, and photocatalytic properties. 5−9 A wide variety of synthetic routes have thus been proposed to prepare specific nanostructures of ZnO, including nanorods, 10 nanowires, 11 nanobelts, 12 tetrapods, 13 and many other anisotropic prototypes in order to further the development of ZnO nanostructures. Among the many synthetic approaches, wet chemistry is an effective way for the production of ZnO nanostructures. In wet-chemistry processes, capping reagents are often required to control the crystal growth of the materials to enable the formation of nanostructures. Meanwhile, by suitably modulating the reactant concentrations, 14 reaction temperature, solvent, 15 organic additives, 16 and quenching treatments 17 during the reaction, ZnO nanostructures, with controllable dimensions, have been obtained. Most of the above operations, however, involve complicated synthetic procedures, which may hinder the applicability of the products. Therefore, development of a simple, environmentally friendly method to prepare ZnO nanostructures with controllable morphology is crucial to their practical applications and has thus become an important topic of investigation. The precipitat...

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Section: ■ Introductionmentioning

confidence: 99%

Effects of Morphology and Zr Doping on Structural, Optical, and Photocatalytic Properties of ZnO Nanostructures

Selvam

Vijaya

Kennedy

2012

Ind. Eng. Chem. Res.

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“…As a result, all those characteristic behaviors are potentially broadening the ZnO technological applications, such as in UV-light emitters, solar cell windows, thin-film transistors, biological and chemical gas sensors, and biomedical sensors varistors [7]. Among these properties, the extremely photocatalytic characteristic with ultraviolet (UV) light, ZnO displayed excellent potentials for photocatalyst applications in wastewater treatments [8,9]. However, the photoinduced recombination process of the hole and electron in ZnO happens quickly, which restricts ZnO in industrial applications [10].…”

Section: Introductionmentioning

confidence: 99%

Structural, Morphological and Optical Bandgap Analysis of Multifunction Applications of Y2O3 -ZnO Nanocomposites : Varistors and Visible Photocatalytic Degradations of Wastewater

AlAbdulaal

AlShadidi

Hussien

et al. 2021

Preprint

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In this study, a combustion method as an efficient, easy, low-cost, and eco-friendly technique was used to synthesize nano-ZnO as a matrix with different yttrium doping ratios with different doping concentrations. Not only X-ray diffraction (XRD), but also scanning electron microscopy (SEM), and Fourier transformation Infrared spectroscopy (FT-IR) technique employed to characterize the structural and surface morphology of the Y2O3-ZnO nanocomposites. The obtained results supported ZnO's growth from crystalline to satisfactory nanoparticle structure by changing the yttrium doping concentrations inside ZnO nanoparticles. Moreover, UV-Vis diffuse reflectance spectroscopy, AC electrical conductivity, and current-voltage characteristics were considered to characterize the effects of yttrium doping on the energy bandgaps and electrical/dielectric properties and discussed the parameters of the ceramic varistors of the studied Y2O3-ZnO nano-complex oxides. The photocatalytic degradation efficiency of phenol, Methylene Blue, and Rhodamine B was investigated using all prepared Y2O3-ZnO nanostructured samples. As the yttrium doping ratios increased, the photocatalytic efficiency increased. After the addition of moderate Y3+ ions-doping, Further generation of hydroxyl radicals over ZnO. For Y2O3-ZnO (S5), the optimal photocatalyst is a degradation of 100 % of phenol, Methylene Blue, and Rhodamine B solutions compared to 80% of photocatalysis for ZnO stand alone. The prepared Y2O3-ZnO nanostructured materials are considered novel potential candidates in broad nano-applications ranging from biomedical and photocatalytic degradation for organic dyes and phenol to environmental and varistor applications.

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La-doped ZnO nanoflower as photocatalyst for methylene blue dye degradation under UV irradiation

Hemalatha¹,

Karthick

Hemalatha³

et al. 2015

J Mater Sci: Mater Electron

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Novel sol-gel synthesis of cerium-doped ZnO thin films for photocatalytic activity

Cited by 7 publications

References 0 publications

Effects of Morphology and Zr Doping on Structural, Optical, and Photocatalytic Properties of ZnO Nanostructures

Effects of Morphology and Zr Doping on Structural, Optical, and Photocatalytic Properties of ZnO Nanostructures

Structural, Morphological and Optical Bandgap Analysis of Multifunction Applications of Y2O3 -ZnO Nanocomposites : Varistors and Visible Photocatalytic Degradations of Wastewater

La-doped ZnO nanoflower as photocatalyst for methylene blue dye degradation under UV irradiation

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