Characterization of undoped and Co doped ZnO nanoparticles synthesized by DC thermal plasma method

Nirmala, M. Joyce; Anukaliani, A.

doi:10.1016/j.physb.2010.12.026

Cited by 45 publications

(13 citation statements)

References 28 publications

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“…2 shows also that clear sharp peaks coinciding with other impurities did not appear, suggesting that new phases did not arise and cobalt atoms were substituted within ZnO crystal lattices (Feng et al, 2009). At higher cobalt content, the peaks of diffraction appeared sharper which is in agreement with previous study (Nirmala and Anukaliani, 2011). In contrast, at a cobalt content of 14%, the diffraction peaks were smaller and no peaks of cobalt compounds or cobalt existed, indicating the crystallization process was inhibited by means of impurity atoms.…”

Section: Structural Analysissupporting

confidence: 90%

Simple Fabrication and Characterization of Piezoelectric Nanogenerators from Cobalt-Doped Zinc Oxide Nanofibers

Suyitno

Hadi

Sahdan

et al. 2017

American Journal of Applied Sciences

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The ferromagnetic cobalt doped into Zinc Oxide (ZnO) crystals is a promising method for enhancing the performance of PiezoelectricBased Nano Generators (PENGs). The study reports the characterization and testing PENGs which simply fabricated from cobalt-doped ZnO nanofibers (NFs) synthesized by electro spinning machine. The electro spinning processes were conducted at a flow rate of 4 µL/min and at various cobalt concentrations followed by sintering at a temperature of 500°C. The X-Ray Diffraction (XRD) spectra demonstrate that the crystalline diameter of Co-doped ZnO NFs increased as the content of cobalt increased, up to a concentration of 9%. Meanwhile, the maximum output voltage and power density of PENGs with Co-doped ZnO NFs were 221.6 mV and 148.8 nW/cm 2 , respectively when the PENGs were subjected to a cyclic mechanical load of 0.5 kg. Therefore, PENGs fabricated from Co-doped ZnO NFs are challenging for the next generation of self-powered devices.

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Section: Structural Analysissupporting

confidence: 90%

Simple Fabrication and Characterization of Piezoelectric Nanogenerators from Cobalt-Doped Zinc Oxide Nanofibers

Suyitno

Hadi

Sahdan

et al. 2017

American Journal of Applied Sciences

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show abstract

“…7 indicates a large blueshift of the band gap corresponding to samples of pure and 7 % Co-doped ZnO nanoparticles, respectively. The increase in the band gap or blueshift can be explained by the Burstein-Moss effect (Nirmala and Anukaliani 2011). This is the phenomenon that the Fermi level merges into the conduction band with an increase in the carrier concentration.…”

Section: Resultsmentioning

confidence: 99%

Structure, optical properties and synthesis of Co-doped ZnO superstructures

2012

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Co-doped ZnO nanoparticles were synthesized by a simple chemical method at low temperature with Co:Zn atomic ratio from 0 to 7 %. The synthesis process is based on the hydrolysis of zinc acetate dihydrate and cobalt acetate tetrahydrate heated under reflux to 65°C using methanol as a solvent. X-ray diffraction analysis reveals that the Co-doped ZnO crystallizes in a wurtzite structure with crystal size of 12-5 nm. These nanocrystals selfaggregated themselves in a highly spherical superstructure of broad size distribution. High-resolution transmission electron microscopy image also shows that each sphere is made up of numerous nanocrystals with average interfringe distance of *0.28 nm. The X-ray diffraction patterns, energy dispersive X-ray, scanning electron microscopy and high-resolution transmission electron microscopy micrographs of doping of Co in ZnO confirmed the formation of spherical superstructure and indicated that the Co 2? is successfully substituted into the ZnO host structure of the Zn 2? site. The optical band gap of ZnO nanoparticles was remarkably from 3.32 to 4.12 eV with increase of Co doping levels from 0 to 7 %. Photoluminescence measurements confirm these results.

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“…As a II-VI semiconductor, ZnO is widely used in many optical and optoelectronic devices such as solar cells [2], luminescent [3], electrical and chemical sensors [4], and varistors [5]. Among the different methods of synthesis of ZnO nanostructures such as chemical vapor phase [6], hydrothermal [7], sol-gel [8], co-precipitate [4], sonochemical [9], DC thermal plasma [10], and hydrolization [11], the electrooxidation method is one of the best growth methods; because this technique generates nanoparticles in the variety of size and structures [12].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of ZnO nanoparticles and flower-like nanostructures using nonsono- and sono-electrooxidation methods

2013

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Characterization of undoped and Co doped ZnO nanoparticles synthesized by DC thermal plasma method

Cited by 45 publications

References 28 publications

Simple Fabrication and Characterization of Piezoelectric Nanogenerators from Cobalt-Doped Zinc Oxide Nanofibers

Simple Fabrication and Characterization of Piezoelectric Nanogenerators from Cobalt-Doped Zinc Oxide Nanofibers

Structure, optical properties and synthesis of Co-doped ZnO superstructures

Synthesis of ZnO nanoparticles and flower-like nanostructures using nonsono- and sono-electrooxidation methods

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