MgAl2O4 spinel powders from oxide one pot synthesis (OOPS) process for ceramic humidity sensors

Laobuthee, Apirat; Wongkasemjit, Sujitra; Traversa, Enrico; Laine, Richard M.

doi:10.1016/s0955-2219(99)00153-3

Cited by 90 publications

(48 citation statements)

References 12 publications

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“…Transition metal-oxide spinels are important in many application fields because of their high thermal resistance and catalytic, electronic and optical properties. They are commonly used in semiconductor and sensor technology as well as in heterogeneous catalysis [23][24][25][26][27]. In this report, for the first time, we had presented the green approach for preparation of CoAl 2 O 4 nanoparticles by novel sol-gel method in the presence of gelatin without adding external capping agent, capping agent or template.…”

Section: Introductionmentioning

confidence: 99%

Novel sol–gel method for synthesis of cobalt aluminate and its photocatalyst application

Rahnamaeiyan

Nasiri

Talebi

et al. 2015

J Mater Sci: Mater Electron

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Pure cobalt aluminate (CoAl 2 O 4 ) nanoparticles were successfully synthesized by novel sol-gel method with the aid of Co(NO 3 ) 2 Á3H 2 O, Al(NO 3 ) 3 Á9H 2 O, and gelatin without adding external surfactant or template.Besides, the effect of the dosage of gelatin on the particle size of final product was investigated. Moreover, gelatin plays role as capping agent, reducing agent, and chelate agent in the synthesis CoAl 2 O 4 nanoparticles. The cobalt aluminate nanoparticles were characterized by using X-ray diffraction, scanning electron microscopy, ultraviolet-visible, Fourier transform infrared spectroscopy, and spectra energy dispersive analysis of X-ray techniques. To evaluate the catalytic properties of nanocrystalline cobalt aluminate, the photocatalytic degradation of methyl orange under visible light irradiation was carried out.

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Section: Introductionmentioning

confidence: 99%

Novel sol–gel method for synthesis of cobalt aluminate and its photocatalyst application

Rahnamaeiyan

Nasiri

Talebi

et al. 2015

J Mater Sci: Mater Electron

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“…The electrical resistivity of spinel was reduced by four orders of magnitude when the air humidity increased from 6% RH to 97% RH. Other authors ( Ref 16,24,30) had observed the same trend (i.e., a linear decrease in electrical resistance with increasing humidity) while measuring the insulating properties of spinel in the form of powders or plasma-sprayed coatings. Consequently, those authors proposed the use of spinel materials in the development of ceramic humidity sensors.…”

Section: Influence Of Humidity and Coatingmentioning

confidence: 65%

Comparative Study of the Electrical Properties and Characteristics of Thermally Sprayed Alumina and Spinel Coatings

et al. 2010

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In this study, APS and HVOF processes have been used to prepare alumina (Al 2 O 3 ) and magnesium spinel (MgAl 2 O 4 ) coatings designed for insulating applications. The electrical characteristics, i.e., dielectric strength and electrical resistance (electrical resistivity) were investigated using different methods: dielectric breakdown test, direct current (DC) measurements, and electrochemical impedance spectroscopy (EIS). The electrical resistance was measured at room temperature at different relative humidity (RH) levels (from 6% RH to 95% RH) as well as at 200°C. The coating microstructure, phase composition, and water vapor sorption were studied. Differences in the electrical insulating properties due to the different coating system characteristics are discussed. Of the coatings and conditions investigated in this study, the HVOF spinel coatings showed superior dielectric breakdown strength and electrical resistance stability at high humidity levels.

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“…Several thermal features took place during the heating of the sample. The DTA curve shows a small endothermic peak occurring at 57.4°C accompanied with a weight loss of 9.66% in the TGA curve that attributed to the evaporation of the physically adsorbed water 35,36 . Two sharp peaks followed; the first is an exothermic at 254.2°C while the second is an endothermic one taking place at 261.1°C, attributed to a total weight loss of 35.63% due to successive decomposition of the organo-zirconiaceria complex product of the reaction, and further the carbon evolution.…”

Section: Thermal Analysismentioning

confidence: 99%

Preparation and characterization of ZrO2/CeO2 ceramic composite synthesized by microwave combustion method

Abo-Almaged¹,

Khattab²,

Sadek³

2016

Orient. J. Chem

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ZrO 2 nano-powders with the substitution of; 5, 12 and 17 mole %CeO 2 contents were prepared by a microwave combustion method utilizing Ce(NO 3 ) 3 .6H 2 O, ZrN 2 O 7 .xH 2 O and urea as precursors. The obtained cakes were calcined at different temperatures. XRD, SEM, EDS, and TEM techniques were used to determine the effect of microwave and calcining temperature between 450 to 1000 o C on the prepared powders. The results obtained show the formation of a single phase; a tetragonal solid solution with a particle size ranging between 10 to 20 nm. The densification parameters, phase compositions, microstructures and mechanical properties (micro-hardness) were investigated.

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MgAl2O4 spinel powders from oxide one pot synthesis (OOPS) process for ceramic humidity sensors

Cited by 90 publications

References 12 publications

Novel sol–gel method for synthesis of cobalt aluminate and its photocatalyst application

Novel sol–gel method for synthesis of cobalt aluminate and its photocatalyst application

Comparative Study of the Electrical Properties and Characteristics of Thermally Sprayed Alumina and Spinel Coatings

Preparation and characterization of ZrO2/CeO2 ceramic composite synthesized by microwave combustion method

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