Spectroscopic and fiber optic ethanol sensing properties Gd doped ZnO nanoparticles

Noel, J.L.; Udayabhaskar, R.; Renganathan, B.; Mariappan, Sivalingam Muthu; Sastikumar, D.; Karthikeyan, B.

doi:10.1016/j.saa.2014.04.012

Cited by 38 publications

(10 citation statements)

References 18 publications

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“…It is found that the particles are about 25-34 nm for chemically precipitated ZnO nanostructure. Increase in crystallite size is observed with increase of dopant Dy concentration which is supported by our scanning electron microscope (SEM) observations where the particle size gets enhanced [30]. Co ions in Zn lattice sites could influence the changes of the flower-like morphology as shown in Fig.…”

Section: Structural Studysupporting

confidence: 77%

“…Red shift in the absorption edge is observed in the samples with the Co and Dy dopants [38,39]. This red shift in the absorbance of ZnO after doping is owing to increase of particle size with Co and Dy doping which is supported by our XRD results [30]. Another reason for this red shift can be related to the formation of a shallow level inside the band gap because of impurity atoms (Dy 3+ ) introduced into the wurtzite ZnO lattice [40].…”

Section: Optical Absorption Studiessupporting

confidence: 66%

“…The strain and stress change the interatomic spacing of semiconductors which could affect the energy gap [13,42]. This reduction in band gap is also may be due to the increase in particle size that results the less quantum confinement within nanoparticles [30] As a result, electronic structure of ZnO nanoparticles can be tuned when Co 2+ and Dy 3+ ion is doped into the ZnO lattice which may give the good optical properties. …”

Section: Optical Absorption Studiesmentioning

confidence: 99%

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Influence of Co and Dy Doping on the Optical and Magnetic Properties of ZnO Nanoparticles for DMS Application

Thangeeswari

Murugasen

Velmurugan

2015

J Supercond Nov Magn

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Dysprosium-(Dy) and cobalt (Co)-doped zinc oxide (ZnO) nanoparticles with various concentrations have been synthesized by simple chemical precipitation method. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive X-ray (EDAX) measurements were conducted respectively for the structural, morphological, and compositional investigation of the sample. XRD analysis indicated that diffraction peaks of all the samples can be indexed to the hexagonal wurtzite structure of ZnO. No secondary phases including Co and Dy ions were detected in the samples even for the highest doping concentrations of Dy. Average particle size is found to be 25-34 nm. Scanning electron microscope and transmission electron microscope analysis revealed that the dopant atoms of Co and Dy are homogeneously distributed in ZnO wurtzite structure. The samples were characterized by EDAX to confirm the expected stoichiometry. In the photoluminescence spectra, Dy co-doped samples show a violet emission along with a broad yellow emission due to the 4 F 9/2 -6 H 15/2 inner shell transitions of Dy 3+ ion. The photoluminescence (PL) enhancement process in Dy co-doped ZnO:Co is mainly due to Dy as a sensibilizer which could effectively enhance the luminescence intensity. Absorption spectra of dysprosium-(Dy) and cobalt (Co)-doped ZnO nanoparticles exhibited enhanced optical absorption in visible region. Magnetization measurements have shown that the particles have room temperature ferromagnetic behavior with relatively high coercive fields which are decreasing with the increase of doping concentration. The analysis of optical and magnetic properties shows that Co-and Dy-doped ZnO nanoparticles are a promising material for DMS application and have potential applications in optoelectronic devices.

show abstract

Section: Structural Studysupporting

confidence: 77%

Section: Optical Absorption Studiessupporting

confidence: 66%

Section: Optical Absorption Studiesmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Co and Dy Doping on the Optical and Magnetic Properties of ZnO Nanoparticles for DMS Application

Thangeeswari

Murugasen

Velmurugan

2015

J Supercond Nov Magn

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“…Furthermore, Gd doped ZnO nanomaterials have many advantages and applied potentials for light-emitting displays, catalysis, drug delivery and optical storage devices due to their temperature independent luminescence in ultraviolet (UV) and visible light [16]. It has been reported that Gd doped ZnO shows the best sensitivity in ethanol sensing [17]. Gd doped ZnO has been found to be controlled by external magnetic field and temperature.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of highly efficient Gd doped ZnO photocatalyst irradiated with ultraviolet and visible radiations

Yayapao

Thongtem

Phuruangrat

et al. 2015

Materials Science in Semiconductor Processing

130

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“…For all doped nanostructures, the absorption intensity increased and absorption peaks shifted towards longer wavelengths. With cobalt doping, the absorption spectra became broader after the UV peak observed at 385 nm, which might have been caused by surface-related defects in nanostructured ZnO [40][41][42].…”

mentioning

confidence: 99%

Doping Efficiency in Cobalt-Doped ZnO Nanostructured Materials

Kaphle

Reed

Apblett

et al. 2019

Journal of Nanomaterials

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Nanostructured ZnO thin films doped with cobalt from 5% to 20% were grown on glass substrates by a low-temperature chemical bath deposition (CBD) technique. We compared the doping efficiency of incorporating cobalt in ZnO nanostructured samples doped with cobalt via cobalt nitrate and cobalt chloride. The concentration of cobalt incorporated into the ZnO matrix was precisely determined using inductively coupled plasma mass spectroscopy (ICP-MS). Scanning electron microscopy (SEM) images showed that only at a 0.1 M ratio of the precursor solutions in CBD using cobalt nitrate as a dopant, the morphology of ZnO yielded hexagonally shaped nanorods. At a 1 M ratio of the precursor solutions, SEM images showed that the morphology of ZnO was nanoplatelets at all doping levels, irrespective of the doping method used. The synthesized nanostructures retained the wurtzite hexagonal structure only at 0.1 M precursor solution using cobalt nitrate doping, which was confirmed by X-ray diffraction (XRD) studies. In cobalt-doped samples using cobalt chloride as a dopant, XRD analysis confirmed the formation of a Simonkolleite structure. At 300°C, the Simonkolleite structure was converted to a wurtzite structure without changing the morphology. Electrical conductivity measurements at 300 K showed that ZnO nanorods doped with cobalt using cobalt nitrate yielded the lowest resistivity. The molarity of the precursor solution and dopant was found to have a substantial impact on the morphology and doping efficiency of the ZnO nanostructures.

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Spectroscopic and fiber optic ethanol sensing properties Gd doped ZnO nanoparticles

Cited by 38 publications

References 18 publications

Influence of Co and Dy Doping on the Optical and Magnetic Properties of ZnO Nanoparticles for DMS Application

Influence of Co and Dy Doping on the Optical and Magnetic Properties of ZnO Nanoparticles for DMS Application

Synthesis and characterization of highly efficient Gd doped ZnO photocatalyst irradiated with ultraviolet and visible radiations

Doping Efficiency in Cobalt-Doped ZnO Nanostructured Materials

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