Physics and Technology of Humidity Sensing Through a Solid State Pellet of Cerium Oxide

Sensors & Transducers

Monika SINGH¹  B. C. YADAV¹ 

[1] Nanomaterials and Sensors Research Laboratory, Department of Physics, Lucknow University, Lucknow-226007, India ;

关键词: Humidity;    Pellet;    Sensitivity;    Cerium oxide;    SEM;    XRD.;   

DOI  :  

来源: DOAJ

【 摘 要 】

This paper reports the physics and technology of cerium oxide as solid state humidity sensor. Pellet of cerium oxide powder having diameter 9 mm and thickness 3 mm was made by hydraulic pressing machine under a load of 616 MPa and annealed at 200, 400, 600, 800 oC for 2 hrs in an electric furnace successively. After each step of annealing, this pellet was exposed to humidity in a specially designed humidity chamber. It was observed that as relative humidity (%RH) increases, there is a decrease in the resistance for the entire range of humidity i.e. from 15 to 95 %. The sensitivity of the humidity sensor was found 26 MW/%RH at room temperature. The proposed method in this study provides a simple, reliable and sensitive humidity sensor. The gross structural/phase identification of the pellets/powder was done using X-ray diffraction (XRD) and the surface morphology by scanning electron microscopy (SEM).

【 授权许可】

Unknown