Effect of Gd 3+ and Al 3+ on optical and dielectric properties of ZnO nanoparticle prepared by two-step hydrothermal method

Das, Santanu; Das, Sukhen; Sutradhar, Soumyaditya

doi:10.1016/j.ceramint.2017.02.116

Cited by 63 publications

(26 citation statements)

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“…However, in (3–9%Mn, 1.5%Al)/ZnO samples, which were doped with Al 3+ in addition to Mn 2+ , the amount of absorption and band gap increased, but the degradation efficiency decreased (see section 3.5.). This is due to the increase in the recombination of the electron–hole pair in the presence of Al . The band gap obtained was 3.01, 2.78, and 2.92 eV for (3%Mn, 1.5%Al)/ZnO, (6%Mn, 1.5%Al)/ZnO, and (9%Mn, 1.5%Al)/ZnO samples, respectively.…”

Section: Resultsmentioning

confidence: 92%

“…They showed that 4% mol of Al‐doped ZnO has the highest photodegradation of MO under visible light after 1.5 h (100% degradation). Das et al synthesized Gd 3+ ‐ and Al 3+ ‐co‐doped ZnO nanoparticles (NPs) by hydrothermal method . Results showed the enhanced dielectric response of the 3% Gd 3+ ‐ and Al 3+ ‐co‐doped ZnO in comparison with undoped ZnO sample due to the presence of oxygen vacancies and grain boundaries in the nanostructure.…”

Section: Introductionmentioning

confidence: 99%

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Facile synthesis, characterization, and decolorization activity of Mn²⁺ and Al³⁺ co‐doped hexagonal‐like ZnO nanostructures as photocatalysts

Shahbazkhany

Salehi

Mousavi‐Kamazani

2020

Applied Organom Chemis

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A good photocatalyst with high efficiency can be synthesized easily using eco‐friendly materials and processes. Our synthesized samples exhibit all of the aforementioned features. In this work, manganese co‐doped ZnO at different weight percentages (3, 6, 9, and 15 wt.%) with and without 1.5 wt.% aluminum was synthesized by hydrothermal method, and their photocatalytic activity in aqueous solutions of methyl orange (MO) was investigated under visible light. The structural and optical properties of the samples were characterized using X‐ray powder diffraction, Fourier‐transform infrared spectroscopy, scanning electron microscopy, energy‐dispersive X‐ray analysis, and diffuse reflectance spectroscopy. In this work, Mn2+ ions in the 9%Mn/ZnO sample and Mn2+, Al3+ ions in the (9%Mn, 1.5%Al)/ZnO sample calcined at 800 °C were replaced instead with some Zn2+ ions in hexagonal wurtzite structures of ZnO. These structures were found next to each other in the form of a hexagonal shape that created 3D‐hexagonal‐like ZnO nanostructures. Finally, nanoparticles (NPs) and nano hexagonal‐like ZnO nanostructures were, respectively, dispersed on the surface of 3D‐hexagonal‐like structure of 9%Mn/ZnO and (9%Mn, 1.5%Al)/ZnO. Diffuse reflectance spectroscopy analysis showed that the (9%Mn, 1.5%Al)/ZnO sample had more light absorption than 9%Mn/ZnO. However, contrary to our expectations, the 9%Mn/ZnO sample had better decolorization efficiency (94%) after 60 min under visible light, which could be attributed to a significant increase in the level of recombination by the aluminum ions.

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Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Facile synthesis, characterization, and decolorization activity of Mn²⁺ and Al³⁺ co‐doped hexagonal‐like ZnO nanostructures as photocatalysts

Shahbazkhany

Salehi

Mousavi‐Kamazani

2020

Applied Organom Chemis

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“…Actually, the copper incorporation procedure reduces the MnO 2 nuclear formation and delay in further growth rate which results in a very lower particle dimension . The lattice parameters of the tetragonal lattice ( a = b ≠ c ) are calculated from the relation Here, h , k , and l are the Miller indices, respectively, and d is the interplanar spacing of the plane ( hkl ) calculated using the Bragg’s equation where “ n ” is the order of diffraction, “λ” is the wavelength of the X-ray, and “θ” is the angle of diffraction.…”

Section: Results and Discussionmentioning

confidence: 99%

Synthesis and Property of Copper-Impregnated α-MnO₂Semiconductor Quantum Dots

et al. 2018

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Because of the superior optical and electrical properties, copper-impregnated size tuneable high-temperature stable manganese dioxide semiconductor quantum dots (SQDs) have been successfully synthesized by a modified chemical synthesis technique. Their size-dependent dielectric properties, semiconducting properties, and current–voltage (I–V) characteristics have been investigated. X-ray diffraction pattern and Raman spectra confirmed that the required phase is present. Because of the different sintering temperature tuneable size of SQDs has been found and confirmed by high-resolution transmission electron microscopy. The band gap energy of the material is found to be 1.25–1.67 eV, measured from Tauc plot using UV–vis absorbance spectrum and their semiconducting properties have been confirmed by the non linear current–voltage (I–V) behavior. Most intense green emission peak of photoluminescence (PL) spectroscopy confirms the oxygen vacancy defect state. The stoke shifting of Raman spectra, UV absorption, and PL emission are the footprint of quantum confinement effect. Incorporation of a little amount of Cu in tetragonal hollandite structure of α-MnO2 generates strain within that structure. This leads to create sufficient crystal defect state as well as rise in dielectric constant accompanied with low dielectric loss and higher ac conductivity. All these highly desirable properties make the SQDs a potential candidate for developing multifunctional photo-electronic devices. Owing to the tuneable band gap and electronic transport of the SQDs, we realized that the controllable size paves the way for designing SQDs possessing unique properties for optical and electronic device applications. Using this material as a high dielectric separator, a high-performance supercapacitor has been successfully fabricated which can light up 15 light-emitting diodes for 47 min 23 s after charging them only for 30 s.

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“…e doping thus modifies its optical, electrical, and dielectric properties by changing the bandgap and electronic structure of the composite material. Due to enhanced properties, it turned perfect for different technological applications like LED, TFTs, memory cells, solar cells, photocatalyst, gas sensors, lasing, storage devices, and photodetectors [129,130]. Various researchers have synthesized different composites and have checked their dielectric properties.…”

Section: Compositesmentioning

confidence: 99%

Dielectric Properties of ZnO-Based Nanocomposites and Their Potential Applications

Kaur

Bharti

Sharma

et al. 2021

International Journal of Optics

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Energy storage devices constitute one of the research areas in recent years. Capacitors are commonly used for the storage of electrical energy. The current research is focusing on not only the improvement in energy density but also the materials which are environment friendly. Polymer composites are known to be technically essential materials owing to their wide range of applications. Enormous research has been devoted to zinc oxide- (ZnO-) based polymer nanocomposites, due to their extraordinary dielectric properties. This review article presents a detailed study of the dielectric properties of ZnO-based nanocomposites. The dielectric constant study includes the effect of transition metals and rare earth metals as a dopant in ZnO. This review gives an insight into the mechanism responsible for the variation of dielectric constant in ZnO nanocomposites due to various factors like size of nanoparticles, thickness of the thin film, operating frequency, doping concentration, and atomic number. The observations have been summarized to convey the mechanism and structural changes involved in the ZnO nanocomposites to the researchers. The deployment of biodegradable nanocomposite materials is expected to open an innovative way for their outstanding electronic applications as storage materials.

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Effect of Gd 3+ and Al 3+ on optical and dielectric properties of ZnO nanoparticle prepared by two-step hydrothermal method

Cited by 63 publications

References 50 publications

Facile synthesis, characterization, and decolorization activity of Mn²⁺ and Al³⁺ co‐doped hexagonal‐like ZnO nanostructures as photocatalysts

Facile synthesis, characterization, and decolorization activity of Mn²⁺ and Al³⁺ co‐doped hexagonal‐like ZnO nanostructures as photocatalysts

Synthesis and Property of Copper-Impregnated α-MnO₂Semiconductor Quantum Dots

Dielectric Properties of ZnO-Based Nanocomposites and Their Potential Applications

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Effect of Gd 3+ and Al 3+ on optical and dielectric properties of ZnO nanoparticle prepared by two-step hydrothermal method

Cited by 63 publications

References 50 publications

Facile synthesis, characterization, and decolorization activity of Mn2+ and Al3+ co‐doped hexagonal‐like ZnO nanostructures as photocatalysts

Facile synthesis, characterization, and decolorization activity of Mn2+ and Al3+ co‐doped hexagonal‐like ZnO nanostructures as photocatalysts

Synthesis and Property of Copper-Impregnated α-MnO2Semiconductor Quantum Dots

Dielectric Properties of ZnO-Based Nanocomposites and Their Potential Applications

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Product

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Facile synthesis, characterization, and decolorization activity of Mn²⁺ and Al³⁺ co‐doped hexagonal‐like ZnO nanostructures as photocatalysts

Facile synthesis, characterization, and decolorization activity of Mn²⁺ and Al³⁺ co‐doped hexagonal‐like ZnO nanostructures as photocatalysts

Synthesis and Property of Copper-Impregnated α-MnO₂Semiconductor Quantum Dots