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Vol. 6, Special Issue, August 2009, pp.117-127

 

 

Bullet

 

Effect of Organic Vapour on Porous Alumina Based Moisture Sensor in Dry Gases

 

1,*Saakshi DHANEKAR, 1Tarikul ISLAM, 1S. S. ISLAM,
2Kamalendu SENGUPTA, 2Debdulal SAHA

1Nano-Sensor Research Laboratory, Jamia Millia Islamia (Central University),

New Delhi -110025, India

2Central Glass and Ceramic Research Institute,

Jadavpur, Kolkata-700032, West Bengal, India

*E-mail: saakshi.dhanekar@yahoo.com

 

 

Received: 10 July 2009   /Accepted: 31 July 2009   /Published: 10 August 2009

 

Abstract: A capacitive porous alumina based trace moisture sensor in the range of 50 to 500 ppm (V) was fabricated by low cost sol-gel technique. The cross-sensitivities due to the presence of organic vapours like ethanol, methanol, acetone and benzene were studied. The change in response and recovery time with ppm for moisture sensing was also calculated. The experimental results conclude that moisture sensor is responsive to the polar organic vapours but has almost negligible response to the nonpolar molecules like benzene. Response of the sensor to the organic vapours as compared to the moisture sensitivity is very less. The effect of ambient temperature was found to be negligible.

 

Keywords: Sol-gel technique, Porous alumina, Traces moisture sensor, Cross-sensitivity, Response time, Recovery time

 

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