Abstract
Portable, compact, wireless and hand held electronic alarm which can detect Hydrogen Sulphide (H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> S) gas at room temperature from 1 ppm to 40 ppm is fabricated using nanostructured Tin oxide (SnO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) thin film deposited on quartz using Langmuir Blodgett (LB) technique. It was demonstrated that SnO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> thin film with gold contacts works as a chemiresistive, selective and sensitive sensor for H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> S gas at room temperature. Few SnO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> thin films were studied for extracting the sensitivity and accuracy parameters of the sensor. Using the optimized parameters, an electronic alarm with less than 5 V input power requirement was fabricated to make it inherently safe for explosive environments. Specificity, reliability and stability studies of the sensors showed satisfactory performance for using these sensors for monitoring H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> S leak. Along with 3D printed light weight gas sensor housing, it makes a hazard free, compact, reliable and versatile sensing device.
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