Structural and Sensing Characteristics of CdS-TiO2 film as LPG Sensor at Room Temperature

Asian Resonance(P: ISSN No. 0976-8602 RNI No.UPENG/2012/42622 VOL.-7, ISSUE-4, October-2018 E: ISSN No. 2349-9443 )

Abstract



 Ankit Kumar Vishwakarma 

Thin Film Laboratory, Department of Physics, Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur, (U.P.) India



Lallan Yadava

 Thin Film Laboratory, Department of Physics, Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur, (U.P.) India

The structural properties and sensing behavior of liquefied petroleum gas (LPG) for cadmium sulphide (CdS) doped titanium dioxide (TiO2) composite film is investigated. Undoped TiO2 and 1 wt % CdS doped TiO2 films are grown onto alumina substrate. Structural properties are investigated using X-Ray diffraction (XRD). The XRD measurement reveals that the crystallites sizes of TiO2 were found 25.6 nm and 22.6 nm for undoped TiO2 and CdS-TiO2 film respectively. The CdS content reduced the crystallite size. The fabricated undoped and CdS doped TiO2 composite are used as a sensing film for detection of LPG at 25 0C. The variation in resistance of the fabricated sensor undoped TiO2 (S1) and 1 wt% CdS-TiO2 (S2) is measured varying the concentration of LPG (0- 5000 ppm) in air ambient at room temperature. We observed that S2 sensor show maximum response to LPG (35%) which is 2.5 times more than S1 for concentration of LPG 5000 ppm. The response and recovery time of fabricated sensor are 130 sec and 350 sec. Thus, CdS-doped TiO2 film is promising sensing film for the detection of LPG at 25 0C.

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http://www.socialresearchfoundation.com/upoadreserchpapers/1/237/1907100918431st%20ankit%20vishwakarma.pdf


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