Characterization of H2S gas sensor based on CuFe2O4nanoparticles

Mohammad Abu Haija, Ayah F.S. Abu-Hani, Najwa Hamdan, Samuel Stephen, Ahmad I. Ayesh

Research output: Contribution to journalArticlepeer-review

121 Citations (Scopus)

Abstract

Copper ferrite (CuFe2O4) nanoparticles were prepared by the sol-gel auto-combustion method and used to construct a conductometric gas sensor in this work. The as-prepared CuFe2O4nanoparticles were annealed at 500 °C and 750 °C. X-ray diffraction measurements as well as transmission electron microscopy were used to identify the crystal structure of as-prepared and annealed nanoparticles. The results reveal growth of nanoparticle size crystal structure as well as phase transition from cubic structure to tetragonal symmetry upon annealing. Fourier Transform Infra-Red Spectroscopy (FTIR) measurements of the CuFe2O4nanoparticles revealed the tetrahedral and octahedral absorption bands that are characteristic of the spinel ferrite. Nanoparticle powder was pressed in a form of a pellet to form the gas sensor device. The pellet was placed between a copper sheet and a stainless steel grid for the bottom and top electrodes, respectively. The results revealed that the produced CuFe2O4nanoparticles are sensitive to both H2S and H2, but with higher sensitivity to H2S at low temperatures. The gas sensitivity of the sensors could be investigated in terms of the large number of reactive surface sites due to the large surface area of the nanoparticles as well as the adsorption of oxygen species on the surface of nanoparticles.

Original languageEnglish
Pages (from-to)461-468
Number of pages8
JournalJournal of Alloys and Compounds
Volume690
DOIs
Publication statusPublished - 2017
Externally publishedYes

Keywords

  • CuFeO
  • Gas sensor
  • Hydrogen sulfide
  • Nanoparticles
  • Sol-gel
  • Spinal ferrite

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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