Preparation of double-doping [formula omitted] thin film for ethanol sensing application

Abstract

• La0.8Pb0.1Ca0.1 Fe O3 sample crystallizes in the orthorhombic structure with Pnma space group. • Our compound presents a nano-metric size. • L a 0.8 P b 0.1 C a 0.1 F e O 3 shows a p-type semiconductor behavior. • L a 0.8 P b 0.1 C a 0.1 F e O 3 sensor is a captor of ethanol-gas even with low concentration equal to 5 ppm. • T=250°C is the operating temperature of L a 0.8 P b 0.1 C a 0.1 F e O 3 sensor. Recently, perovskite-based nanomaterials are used in diverse applications. Many perovskite nanoparticle-based devices have been demonstrated with extraordinary sensing performances to various chemical species in both solid and solution states. In this context, a new ethanol gas sensor L a 0.8 C a 0.1 P b 0.1 F e O 3 has been developed. L a 0.8 C a 0.1 P b 0.1 F e O 3 film has been prepared using the drop coating method onto S i O 2 / S i transducers with platinum interdigited electrodes based on the use of nanopowders which are prepared by sol-gel method. X -ray diffraction ( XRD ) showed that our sample was still perovskite phase with orthorhombic structure with P n m a space group. The electrical properties showed the P -type semiconductor behavior of our sensor and the ethanol sensing measurements revealed his good sensitivity towards C 2 H 5 O H -gas. The response ( S = R g / R a ) was found to increase from 2.040 to 3.250 when concentration increased from 5 p p m to 30 p p m at the operating temperature of 250 ∘ C . L a 0.8 P b 0.1 C a 0.1 F e O 3 sensor response ( S ) to different concentrations ( 5 , 10 , 20 a n d 30 p p m ) of ethanol gas ( C 2 H 5 O H ) at T O p = 250 ∘ C and for an exposure time equal to 4 m i n .