Electrical conduction and dielectric studies of ZnO pellets

Chaari, Mariem; Matoussi, Adel

doi:10.1016/j.physb.2012.04.056

Cited by 93 publications

(50 citation statements)

References 49 publications

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“…Furthermore, ZnO shows attractive applications in optoelectronics, electronics, and laser technology because of its high bond energy (60 meV), broad band gap (3.37 eV), and high mechanical and thermal stability at room temperature [3,4]. Besides, the pyro-and piezo-electric properties of ZnO enable its utilization in sensors, converters and energy generators [5,6]. In addition, extensive research indicates that the properties of ZnO such as photoluminescence (PL), photovoltaics (the conversion of sunlight to electrical power), electron trapping, effective charge separation (charge transfer), the formation of defects, Lewis acid/base properties and strong metal-ZnO interactions, etc., establish its important roles in catalysis including photo-catalysis, photo-electronic catalysis, and thermo-catalysis [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

The Applications of Morphology Controlled ZnO in Catalysis

et al. 2016

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Zinc oxide (ZnO), with the unique chemical and physical properties of high chemical stability, broad radiation absorption range, high electrochemical coupling coefficient, and high photo-stability, is an attractive multifunctional material which has promoted great interest in many fields. What is more, its properties can be tuned by controllable synthesized morphologies. Therefore, after the success of the abundant morphology controllable synthesis, both the morphology-dependent ZnO properties and their related applications have been extensively investigated. This review concentrates on the properties of morphology-dependent ZnO and their applications in catalysis, mainly involved reactions on green energy and environmental issues, such as CO 2 hydrogenation to fuels, methanol steam reforming to generate H 2 , bio-diesel production, pollutant photo-degradation, etc. The impressive catalytic properties of ZnO are associated with morphology tuned specific microstructures, defects or abilities of electron transportation, etc. The main morphology-dependent promotion mechanisms are discussed and summarized.

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Section: Introductionmentioning

confidence: 99%

The Applications of Morphology Controlled ZnO in Catalysis

et al. 2016

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“…It has tremendous scientific and technological interest due to direct wide band gap energy (3.37 eV), large exciton-binding energy (60 meV) and high thermal and mechanical stability at room temperature make it attractive for potential use in electronics, optoelectronics and laser technology [3,4]. The piezo-and pyroelectric properties of ZnO mean that it can be used as a sensor, converter, energy generator and photocatalyst in hydrogen production [5,6]. Because of its hardness, rigidity and piezoelectric constant it is an important material in the ceramics industry, while its low toxicity, biocompatibility and biodegradability make it a material of interest for biomedicine and in pro-ecological systems [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterizations of Zinc Oxide Nanoparticles for Antibacterial Applications

Getie¹,

Belay²,

Ar³

et al. 2017

J Nanomed Nanotechnol

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In this study various shapes and sizes of the wurtzite structure of ZnO nanoparticles were synthesised via a wet chemical method for antibacterial applications. The synthesised ZnO NPs were also modified using biologically active compound, caffeine. The ZnO nanoparticles were investigated by XRD, SEM, FTIR, UV-Vis and Fluorescence spectroscopy. The average crystallite size of the ZnO NPs using XRD was within the ranges of 28.09-31.86 nm. The shape of ZnO NPs synthesised from Zn (NO 3 ) 2 .6H 2 O, ZnCl 2 and Zn (CH 3 COO) 2 .2H 2 O grain, spherical and rod-like respectively. The variations in size and shape of ZnO NPs are due to the difference in precursors and calcinations temperature. The absorption peak of the ZnO NPs was observed at 278 nm, 374 nm and 378 nm for ZnCl 2 , Zn (NO 3 ) 2 .6H 2 O and Zn (CH 3 COO) 2 .2H 2 O respectively. The FTIR peaks due to vibrational phonons of ZnO NPs also confirm the successful production of ZnO nanoparticles. The emission spectra of ZnO NPs were observed in ultraviolet due to the electronic transition from conduction band edge to valence band, and visible emission band due to defects that are related to deep level emissions. The synthesised ZnO NPs were applied for antibacterial activity against S. aureus and E. coli bacteria using agar disc diffusion method. All the three ZnO Nps performed better antibacterial activity than the standard antibiotics and also S. aureus was shown to be more sensitive to ZnO NPs than E. coli.

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“…ZnO is a multifunctional material [9]. The piezo-electric and pyroelectric properties of ZnO mean that it can be used as a sensor, converter, energy generator and photo catalyst in hydrogen production [10].…”

Section: Introductionmentioning

confidence: 99%