Mn doped Ni-Zn ferrite thick film as a highly selective and sensitive gas sensor for Cl sub(2) gas with quick response and recovery time

Abstract

The Ni sub(0.7-x) Mn sub(x) Zn sub(0.3) Fe sub(2) O sub(4) (x = 0.1-0.4) ferrites were characterized by X-ray diffraction, Transmission electron microscopy, X-ray photoelectron spectroscopy, and Mossbauer spectroscopy. The thick films of these ferrites were fabricated on a glass substrate to use as a Cl sub(2) sensor. The ferrite thick film with composition x = 0.3 showed a selectively high response towards Cl sub(2) gas at an operating temperature of 100 degrees C. The response varied from 115 to 212 percent for 20-300 ppm of Cl sub(2) gas. The response time was found to be within 10 s while the recovery time was less than 15 s. The results were quite reproducible thus making this material a good sensor for Cl sub(2) gas.