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Vol. 122, Issue 11, November 2010, pp.66-71

 

Bullet

Studies of CNT and Polymer Based Gas Sensor

 

Monika JOSHI and R. P Singh

Amity Institute of Nanotechnology, Amity University Uttar Pradesh,

Sector -125,Noida (U.P) 201301, India

Tel.:+91-120-432130, fax:+91-120-4392502

E-mail: mjoshi@amity.edu, rpsingh@aint.amity.edu

 

 

Received: 16 October 2010   /Accepted: 18 November 2010   /Published: 30 November 2010

 

Abstract: Gas sensors of different types are being used for environmental monitoring. Among all the gas sensors CNT based gas sensors are widely used .The gas sensors consist of polymer- CNT as an active layer, where the adsorption of gas molecules leads to a large change in its electrical resistivity. They have merits of being low cost, good sensitivity, and convenient to measure response (a simple change in resistance). In the present investigation purified multi wall carbon nanotubes (MWNT) have been used as a sensing material for detecting ammonia gas. In this work, a thick film of Carbon nanotube -polymer was prepared and painted over ring types of electrodes. Carbon nanotubes are highly efficient gas adsorption agents due to their high surface-to-volume ratio. In order to improve the efficiency of the sensor CNT-polyvinyl pyroiodine composite film was prepared. The gas sensing properties of the composite film for ammonia vapor were tested by measuring the resistance during a span of 720 seconds at an interval of 10 seconds each. A composite polymer CNT film showed a high response and rapid sensing to the test gas. The observations were taken by varying the concentration of ammonia at room temperature. An increase in resistance has been observed with the increase in time. The sensing mechanism of the composite has been explained on the basis of volume expansion and polar interaction of various vapors on the carbon nanotubes surface.

 

Keywords: Multi wall carbon nano tubes, Composite film

 

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