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Vol. 134, Issue 11, November 2011, pp.132-142

 

Bullet

 

Synthesis and Characterization of Nano-Crystalline Cu and Pb0.5-Cu0.5- ferrites by Mechanochemical Method
and Their Electrical and Gas Sensing Properties

 

*1 V. B. GAIKWAD ,1 S. S. GAIKWAD, 2 A. V. BORHADE and 1 R. D. NIKAM

*1 Chemistry Research Center, Department of Chemistry, K. T. H. M. College, Nashik, 422002, India

2 Chemistry Research Center, HPT Arts and RYK Science College, Nashik, 422005, India

E-mail: gaikwadvb@rediffmail.com, gaikwad.sharad85@gmail.com, ashokborhade2007@yahoo.co.in

 

 

Received: 7 July 2011   /Accepted: 21 November 2011   /Published: 29 November 2011

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Abstract: In the present communication, we have reported the synthesis of nanocrystalline ferrites of the type CuFe2O4 and Pb0.5Cu0.5Fe2O4 by mechanochemical alloying at 960 0C. The samples prepared were characterized by X-ray diffraction (XRD), VSM, FT-IR, UV-DRS, and SEM. The average particle size was determined by XRD pattern using Scherrer equation and it is 7.295 nm, 4.484 nm for CuFe2O4, and Pb0.5Cu0.5Fe2O4. The surface morphology of the samples is characterized by scanning electron microscopy (SEM). Magnetic studies were carried out using vibrating sample magnetometer (VSM) and shows very high coercive field for the mixed ferrite. UV-DRS studies were performed to investigate the band gap of synthesized nanocrystalline material. Electrical properties show semiconducting nature of synthesized ferrites. The thick films of the material were prepared by screen printing method. The gas sensing properties were studied towards reducing gases like CO, NH3 and H2S and it was revealed that CuFe2O4 is the most sensitive and selective to H2S gas at relatively lower operating temperature 200 0C. Furthermore Pb0.5Cu0.5Fe2O4 also shows the response to H2S at operating temperature 300 0C.

 

Keywords: Ferrites; VSM; XRD; Mechanochemical method; Gas sensing

 

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