Influence of Cr incorporation on structural, dielectric and optical properties of ZnO nanoparticles

Hassan, Mohammed; Khan, Wasi; Azam, Ameer; Naqvi, Andleeb Z.

doi:10.1016/j.jiec.2014.01.047

Cited by 119 publications

(15 citation statements)

References 51 publications

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“…It is seen that σ ac decreases with increasing Ni concentration in SnO 2 . , Defects are formed in the SnO 2 system by doping, while upon sintering of the pellets, defects tend to separate at the grain boundaries through the diffusion process. Hence, the defects hinder the transportation of charge carriers and decrease the conductivity of the sample …”

Section: Characterizationmentioning

confidence: 96%

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Ni-Doped SnO₂ Nanoparticles for Sensing and Photocatalysis

Kandasamy

Seetharaman

Dhanuskodi

et al. 2018

ACS Appl. Nano Mater.

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Ni-doped SnO2 nanoparticles were synthesized by a coprecipitation route and showed superior properties for a series of different applications. The 1 atom % Ni-doped SnO2 NPs exhibited excellent electrochemical performance as supercapacitors to deliver a specific capacitance of 793 F g–1 at an applied current density of 2.5 A g–1 in a KOH electrolyte while retaining its capacitance over 1250 cycles. The energy-dependent (100, 150, and 200 μJ) nonlinear absorption behavior of the Ni-doped SnO2 NPs was investigated and found to be due to the effective two-photon absorption with free carrier absorption. A clad-modified fiber-optic gas-sensor setup was used to sense the ammonia at ambient temperature. Further, the photocatalytic degradation of Rhodamine B, Congo red, and Direct red dyes by the Ni-doped SnO2 NPs was examined under visible-light irradiation.

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Section: Characterizationmentioning

confidence: 96%

“…The appearance of relaxation peaks is due to the hopping frequency of the charge carriers matched with the frequency of the applied ac electric field. The disappearance of the relaxation peak in SN7 reveals the high-resistivity nature of the sample …”

Section: Characterizationmentioning

confidence: 98%

Ni-Doped SnO₂ Nanoparticles for Sensing and Photocatalysis

Kandasamy

Seetharaman

Dhanuskodi

et al. 2018

ACS Appl. Nano Mater.

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“…At lower frequencies, all samples exhibit high dielectric constant, the value of (ε′) decreases as the frequency increases, which may be attributed to interfacial relaxation effect also known as Maxwell‐Wagner‐Sillars (MWS) effect. The decrease in dielectric constants indicates that good conductive grains become created within isolated grain boundaries 55 . The effect of charge polarization has been represented by the higher values of the dielectric at lower frequency region; electrical dipoles get sufficient time to align with the field before the variation of the electric field, then the dielectric constant becomes high.…”

Section: Resultsmentioning

confidence: 99%

Fabrication, microstructure, and nonlinear/linear optical parameters of polymeric‐based poly(vinyl alcohol)/poly(vinyl pyrrolidone) nanocomposites films for optical attenuation applications

Nawar

Ali

Khairy

et al. 2022

Polymers for Advanced Techs

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Herein, a novel proposed optical attenuator poly(vinyl alcohol)/poly(vinyl pyrrolidone) (PVA/PVP) doped PbS (NPs) nanoparticles nanocomposites films. The samples are fabricated by casting‐method to analyze the linear optical properties and estimate the nonlinear optical parameters. The crystal and molecular structure of the fabricated nanocomposites thick (PVA/PVP) films of different PbS (NPs) doping ratios were analyzed by XRD technique and FT‐IR, respectively. The semi‐crystalline nature of the fabricated PVA/PVP is influenced through all samples and the crystallinity is increased. The particle size of PbS (NPs) is increased in the doped samples and the strain parameter is increased. The measured transmission of the fabricated PVA/PVP doped PbS (NPs) films are decreased as the doping ratio of PbS (NPs) is increased. The absorption coefficient is incremented and shows large absorption values in the UV regions, may be utilized in UV‐blocking for saving the human skin, dramatically, and a noticed red‐shift in the edge of absorption for all samples as the doping ratio is increased. The most probable transition is indirect, and the evolved values of the energy gaps between HOMO and LUMO levels are decrement from 3.97 to 2.65 eV as doping ratio of PbS (NPs) is increased. Different models are utilized to evaluate the average values of the real refractive index (2.175–2.438). The fabricated PVA/PVP doped PbS (NPs) samples are investigated for normal light and laser attenuations. The mass attenuation coefficient increases, gradually, with increment of PbS (NPs), but the half value layer (HVL) parameter decreases with increasing of the doping ratio. These experimental results confirm the applicability of the fabricated samples to attenuate Red‐632 nm and Green‐532 nm laser radiation. It is possible to utilize PVA/PVP doped PbS (NPs) nanocomposites in different, wide‐scale optical filters.

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“…Some of the metal dopants suitable for ZnO are Ag, Au, Cu, Cr, and Ni. , Among these, Cr is a suitable candidate due to the close ionic radii to zinc (Zn) implies that Cr 3+ can easily penetrate and replace Zn 2+ ions in the ZnO lattice. The transition metal dopant is mainly preferred for enhancing the transport and photoemission properties. − A variety of methods have been utilized to prepare doped ZnO, including the electron beam evaporation technique, the sol–gel approach, the chemical method, the sputtering method, and the hydrothermal method. , However, fabricating porous material usually consists of complicated procedures, but the hydrothermal process can be followed using urea with a zinc precursor combined with calcination.…”

Section: Introductionmentioning

confidence: 99%

Cr-Doping-Induced Fano Resonance of ZnO-Layered Nanoporous Structures and UV Photodetector Application

Chinnasamy

Paul

Balagopalan

et al. 2023

ACS Appl. Opt. Mater.

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In this study, a layered nanoporous structure of Cr-doped zinc oxide (ZnO) was synthesized by a simple hydrothermal and post-annealing technique. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and ultraviolet (UV)−visible spectroscopy techniques. The XRD peak shift provides additional evidence of the incorporation of the dopant. Field emission scanning electron microscopy was used to confirm the porous morphology. From high-resolution transmission electron microscopy pictures, the pore size and crystallographic layouts were calculated. UV−vis spectra demonstrated that the absorbance improved, and a reduction in band gap was observed with an increment in dopant concentration. The vibrational modes of the produced ZnO sample were analyzed by Raman spectroscopy, which confirmed the absence of other contaminants. Upon addition of the dopant, the phonon peaks showed asymmetric broadening caused by the interaction of discrete states with continuum states. Due to the strong contact, the asymmetry got worse as the dopant concentration increased. Finally, current−voltage (I−V) measurements indicated a great enhancement after Cr doping in UV photoresponse. The UV light detection phenomenon can be ascribed to the trapping and detrapping of electrons by Cr-related defects.

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Influence of Cr incorporation on structural, dielectric and optical properties of ZnO nanoparticles

Cited by 119 publications

References 51 publications

Ni-Doped SnO₂ Nanoparticles for Sensing and Photocatalysis

Ni-Doped SnO₂ Nanoparticles for Sensing and Photocatalysis

Fabrication, microstructure, and nonlinear/linear optical parameters of polymeric‐based poly(vinyl alcohol)/poly(vinyl pyrrolidone) nanocomposites films for optical attenuation applications

Cr-Doping-Induced Fano Resonance of ZnO-Layered Nanoporous Structures and UV Photodetector Application

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Influence of Cr incorporation on structural, dielectric and optical properties of ZnO nanoparticles

Cited by 119 publications

References 51 publications

Ni-Doped SnO2 Nanoparticles for Sensing and Photocatalysis

Ni-Doped SnO2 Nanoparticles for Sensing and Photocatalysis

Fabrication, microstructure, and nonlinear/linear optical parameters of polymeric‐based poly(vinyl alcohol)/poly(vinyl pyrrolidone) nanocomposites films for optical attenuation applications

Cr-Doping-Induced Fano Resonance of ZnO-Layered Nanoporous Structures and UV Photodetector Application

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Product

Resources

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Ni-Doped SnO₂ Nanoparticles for Sensing and Photocatalysis

Ni-Doped SnO₂ Nanoparticles for Sensing and Photocatalysis