Volume No. 8 Issue No.: 4 Page No.: 913-918 April-June 2014

 

DETECTION OF ETHANOL VAPORS BY ZnO/ STILBITE COMPOSITES

 

Lakhane Madhuri A., Khairnar Rajendra S. and Mahabole Megha P.*

Swami Ramanand Teerth Marathwada University, Nanded, Maharashtra (INDIA)

 

Received on : January 20, 2014

 

ABSTRACT

 

This work deals with the detection of ethyl alcohol using the natural stilbite zeolite. Ethanol sensors, which are essential for various industries are fabricated using natural stilbite as a host material and ZnO as the guest material. The composites of ZnO/Stilbite material are prepared by adding ZnO with variable wt% to stilbite via mechanical mixing. The pure and composite stilbite samples are characterized by XRD (X-Ray Diffraction) and FTIR (Fourier Transform Infrared Spectroscopy) techniques. Thick films of ZnO / Stilbite, developed using screen printing technique are employed as ethanol sensors. The XRD profiles confirm the presence of stilbite zeolite and the incorporation of ZnO into the stilbite matrix. Sensing studies show that the ZnO/Stilbite films are sensitive to ethanol. The operating temperature of composite film is found to be a function of ZnO concentration. ZnO with 50% concentration reduces the operating temperature from 111°C to 75°C. The composite film with 50% ZnO concentration gives response to ethanol within 120 seconds and can sense ethanol with a minimum concentration of 250 ppm. The study reveals that ZnO/Stilbite composite thick film can be employed as an ethanol sensor which can be operated at lower temperature.

 

Keywords : Stilbite zeolite, Stilbite / ZnO composite, Ethanol sensor, Thick films, XRD

 

 

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