title: Assessment of structural, morphological, magnetic and gas sensing properties of CoFe(2)O(4) thin films.
abstract: Polycrystalline CoFe2O4thin films are deposited onto the quartz substrates by spray pyrolysis technique. Rietveld refinement analysis confirmed the films are polycrystalline in nature with spinel cubic crystal structure. Rietveld refinement analysis was employed to estimate the cation distribution in spinel lattice sites. Surface micrographs shows the granular morphology with average grain size decreases with increase in solution concentration. The presence of two characteristic absorption bands around 579 and 391cm-1in the FTIR study confirms the formation of single phase CoFe2O4. Vibrating sample magnetometer measurement confirmed the predominant ferrimagnetic nature of thin films which confirms the maximum saturation magnetization with moderate coercivity was useful for making effective gas sensor. The gas response towards different operating temperatures, gas concentrations and solution concentrations was systematically studied. The films show the maximum gas response 70% at 0.1M solution concentration at 150°C operating temperature. The films are well selective towards NO2as compared with other test gases with good reproducibility.
authors.affiliation: Electrochemical Materials Laboratory, Department of Physics, Shivaji University, Kolhapur 416 004, India.
authors.forename: A A
authors.initials: AA
authors.lastname: Bagade
authors.affiliation: Department of Physics, Dattajirao Kadam Arts, Science and Commerce College, Ichalkaranji 416 115, India.
authors.forename: V V
authors.initials: VV
authors.lastname: Ganbavle
authors.affiliation: Electrochemical Materials Laboratory, Department of Physics, Shivaji University, Kolhapur 416 004, India.
authors.forename: S V
authors.initials: SV
authors.lastname: Mohite
authors.affiliation: Computational Electronics and Nanoscience Research Laboratory, School of Nanoscience and Biotechnology, Shivaji University, Kolhapur 416004, India.
authors.forename: T D
authors.initials: TD
authors.lastname: Dongale
authors.affiliation: National Center for Nanoscience and Nanotechnology, University of Mumbai, Santacruz (E), Mumbai 400 098, India.
authors.forename: B B
authors.initials: BB
authors.lastname: Sinha
authors.affiliation: Electrochemical Materials Laboratory, Department of Physics, Shivaji University, Kolhapur 416 004, India. Electronic address: rajpure@yahoo.com.
authors.forename: K Y
authors.initials: KY
authors.lastname: Rajpure
keywords: CoFe(2)O(4); MOS gas sensor; Magnetic properties; Reitveld refinement; Thin films