Abstract

Endi Suhendi*¹, Neng Astri Lidiawati¹, Dani Gustaman Syarif² and Andhy Setiawan¹

DOI : http://dx.doi.org/10.13005/ojc/350134

Preparation and characterization of Al₂O₃-dopped LaFeO₃ thick film ceramics for ethanol gas sensor applications has been conducted. LaFeO₃ ceramics were made by co-precipitation method with doping variation of Al₂O₃ 0% and 3.75 % mole of the main ingredients LaFeO₃ (La₂O₃ and Fe₂O₃). Screen printing technique was employed to make thick film ceramics of LaFeO₃ and Al₂O₃-dopped LaFeO_3. The ceramics were calcined at temperature of 600°C. The analysis results of the characteristics of crystals using X-Ray Difraction (XRD) showed that the made ceramics made had cubic phase with a lattice parameter =a=b=c=39.52nm. The addition of 3.75% mole of Al₂O₃ did not change the crystal phase and lattice parameter values of LaFeO3. The crystallite size of LaFeO3 was 52.17nm while the crystallite size of Al₂O₃-doped LaFeO₃ was 44.52nm. The analysis results of morphological structure ceramics of LaFeO₃ and Al₂O₃-doped LaFeO₃ using Scanning Electron Microscopy (SEM) possessed a grain size of each 0:40 μm and 0.25μm. The electrical characterization results of LaFeO₃thick film ceramics indicated the sensitivity of the sensor increased along with the addition of ethanol gas concentration. The maximum sensitivity value of LaFeO₃thick film ceramics ceramic thick film LaFeO3 and Al₂O₃-doped LaFeO₃ at 300ppm was 4.34 at 330°C and 6.08 at 350°C.The thick film ceramics with the addition of 3.75% mole of Al₂O₃ has a higher sensitivity and potential to be used as ethanol gas sensor.

Al2O3-Doped LaFeO3; Co-Precipitation; Ethanol Gas Sensor; Film Thickness; LaFeO3; Screen Printing

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