Effect of  Surface Network of Single Wall Nanotube on DMMP Response

Deepak Kumar(1,2), Poornendu Chaturvedi(1), Praveen  Saho(1), Abhilasha Chouksey(1), R. P. Tandon(2) and P. K. Chaudhury(1)

 1 -Solid State Physics Laboratory, Lucknow Road, Timarpur, Delhi-110054, India, 

2 - Department of Physics and Astrophysics, University of Delhi, Delhi-11007, India

The response of Dimethyl methylphosphonate (DMMP), a simulant of chemical warfare agent Sarin is investigated towards thick random network and micro aligned network of SWNT  prepared by vacuum filtration and dielectrophoresis respectively. The surface area network of these gas sensors is investigated with SEM. The thick film resistor (CNT-TFR) has less baseline noise as compared to micro aligned resistor (CNT-µR). The response of these gas sensors is studied by exposing increasing  concentration of DMMP from 50 ppm to 1000 ppm and then decreased back to 50 ppm. CNT-µR gives more response to 1000 ppm DMMP as compared to CNT-TFR.