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Adsorption and gas sensing properties of CuFe2O4 nanoparticles

Abu Haija Mohammad, Basina Georgia, Banat Fawzi, Ayesh Ahmad I.

Materials Science Poland

2019

Vol. 37, No. 2

289--295

Spinel ferrite nanoparticles in the form CuFe2O4 were tested for gas sensing applications. Nanoparticles pressed in a disk form were used to construct conductometric gas sensors. The disk was placed between two electrical electrodes wherein the top electrode had a grid structure. The produced sensors were tested against H2S and H2 gases and they were found to be selective and sensitive to H2S concentration as low as 25 ppm. The composition of the nanoparticles was confirmed by X-ray diffraction and energy dispersive X-ray spectroscopy measurements. The crystal structure was verified by both X-ray diffraction and transmission electron microscope. The observations obtained from the experiments demonstrated the high potential of using CuFe2O4 nanoparticles for H2S sensing applications.

Preparation of CuFe2O4/SiO2 nanocomposite by sol-gel method

Plocek J., Hutlová A., Nižňanský D., Buršik J., Rehspringer J.L., Mička Z.

Materials Science Poland

2005

Vol. 23, No. 3

697--705

This work has the aim to characterize the phase relations in the CuFe2O4/SiO2 system. The samples were prepared by the sol-gel method. Final heat treatment of the samples was carried out at temperatures in the range of 800-1100°C. Final products were characterized by HR TEM, X-ray diffraction, magnetic measurements, and Mössbauer spectroscopy. HR TEM revealed nanocrystals of the size of about 7-130 nm, depending on the heat treatment temperature. The spinel structure of CuFe2O4 in the amorphous silica matrix proved to be stable up to 1100°C without decomposition to the copper silicate and iron (III) oxide. At the same time, the amorphous silica matrix recrystallized to the cristobalite at 1100°C.