title: Conduction mechanism and gas sensing properties of CoFe2O4 nanocomposite thick films for H2S gas.
abstract: Nanocrystalline 10 wt% Ni and 0.2 wt% Sm doped CoFe(2)O(4) was prepared by sol-gel citrate method and calcined at different temperatures. The CoFe(2)O(4) nanoparticles were characterized by X-ray diffraction (XRD), electrical properties were studied by impedance analysis. The XRD of CoFe(2)O(4) shows cubic structure with grain growth of 40 nm. The ac conductivity was studied for the sample 10 wt% Ni and 0.2 wt% Sm doped CoFe(2)O(4) calcined at 650°C, at temperature range from 100 to 700°C over a wide range of frequencies from 50 Hz to 200 kHz. The result indicates that the ac conductivity depend on temperature, frequency and concentration of dopant. Nanocrystalline 10 wt% Ni and 0.2 wt% Sm doped CoFe(2)O(4) was found to be good H(2)S sensor with high sensitivity and selectivity.
authors.affiliation: Nano Technology Research Laboratory, Department of Chemistry, Shri Shivaji Science College, Amravati 444602, MS, India.
authors.forename: Anjali B
authors.initials: AB
authors.lastname: Bodade
authors.forename: Archana B
authors.initials: AB
authors.lastname: Bodade
authors.forename: H G
authors.initials: HG
authors.lastname: Wankhade
authors.forename: G N
authors.initials: GN
authors.lastname: Chaudhari
authors.forename: D C
authors.initials: DC
authors.lastname: Kothari
mesh_terms: D019343:Citric Acid / Q000737:chemistry; D003035:Cobalt / Q000737:chemistry; D004553:Electric Conductivity; D017097:Electric Impedance; D004563:Electrochemistry; D005290:Ferric Compounds / Q000737:chemistry; D006358:Hot Temperature; D006862:Hydrogen Sulfide / Q000032:analysis*; D053761:Nanocomposites / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry; D044367:Phase Transition; D012493:Samarium / Q000737:chemistry; D012680:Sensitivity and Specificity; D014961:X-Ray Diffraction
chemical_list: D005290:Ferric Compounds; C001215:ferrite; D019343:Citric Acid; D003035:Cobalt; D012493:Samarium; D009532:Nickel; D006862:Hydrogen Sulfide