Hydrogen Sulfide sensing characteristics of Spinel-type Nanocrystalline Zn0.7Mg0.3Co2O4

Author Affiliations

  • 1Department of Physics, Government Vidarbha Institute of Science & Humanities, Amravati 444604, Maharashtra, India
  • 2Department of Physics, Arts, Science and Commerce College, Chikhaldara 444807, Maharashtra State, India

Res.J.chem.sci., Volume 6, Issue (12), Pages 40-46, December,18 (2016)


Nanocrystalline Zn1-xMgxCo2O4 (x = 0.3) spinel having cubic structure was synthesized by sol–gel method successfully calcined at 500oC for 2 h. The formation of Zn1-xMgxCo2O4 confirms by means of an X-ray powder diffraction (XRD) and Fourier Transform-Infra-red spectrum (FT-IR). Scanning electron microscopy (SEM) was examined the surface morphology. To study hydrogen sulfide gas sensing characteristics of Zn1-xMgxCo2O4 spinel were systematically investigated. Zn1-xMgxCo2O4 showed excellent gas sensing properties like, high gas response towards 50 ppm hydrogen sulfide gas at 100oC, good selectivity at lower operating temperature 100oC. The response and recovery time for Zn1-xMgxCo2O4 were found to be 16 s and 52 s respectively. The results proved that nanocrystalline Zn1-xMgxCo2O4 is a potential candidate for detection of hydrogen sulfide. Moreover, possible hydrogen sulfide sensing mechanism is discussed.


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